User Manual
Contents
1. FR 22 Scattered Read Write CFC Custom Private Function 23 Dealing with Processing Flag Response time Try 1 va edi dto ue 24 PAROCKI Configurator suin edana a hm 25 ssi is Cia mam 25 Polis Polle ddatus Diis Sytem Lala aes 27 Data X tef Transactions dp ub VR e RR T EP 28 Par aio Produit aid ra i rapa Ye uS ra P REN UC Fei a RA DR Fel EUN Fal 29 ccna Men pA ed ed tone tea TA rale ed a am gua una es 30 F nction Codes Supported eeu Reo RV da ie 31 TDN ALCS rasta mae AD M M TN 32 TABLE OF CONTENT Error Gode sucesor phat adn o dro ratte ita 33 Acton COM MANS ou A 35 Suepestohss Tech SUP POE 36 37 38 PAROCKI Applications supplied on Parijat distribution CD The distribution CD carries the following software products PAROCK1 Add on instruction Parock1 L5X Rockwell CLogix import file PAROCK1 Configurator Microsoft NET application Requires NET framework 2 0 or later User Manual Parock1 um PDF format INSTALLATION FOR PAROCK1 CONFIGURATOR Starting Setup 1 Start windows if it s not already2. you pick a command for invo cation The detailed action commands described else where Figure 13 PAROCKI Configurator The white cells are editable however the gray cells are not editable You may click on the status of the Slaves amp Polls to view edit various bits also in a pop up window Various Tabs are described herein Slaves Data such as the address the Port Primary and Port Secondary the TimeOut and the status of the Slaves and the CommEff CommEff Last Try Try Good IP Address Pri and IP Ad dress_Sec Is shown here for viewing amp editing 3 PAROCK1 Configurator Error code CRC BCC Error in Recv Msg PLC IP Address 10 1 1 216 Slot 9 Demo Trial Mode Click on the Tab to refresh data Utilities Slaves Polls Sys Data Data Transaction ParData Product Registration Comme ff Comme Port_Sec Timeout Status Description 0 Based Figure 14 O RTU 1 ASCIl O Ser 1 IP O MBTCP 1 Embedded SwapWords Slaves Status Bits Figure 15 shows the status bits of the slaves as you can see the value for each bit is Swapbytes show on this pop up screen Enable Swap Try only 1 poll if fail Dr Est T Int Redundant Port Avibl Processing 32bit amp ddr Tried once Faulted Al
3. PAROCK I Modbus Master slave serial TCP Add on Instruction for Rockwell s Logix family PLCs User Manual RIIDAN CONTROLWARE INC TABLE OF CONTENTS a 3 4 er Meee lant eats tetto Rte 5 OC Seti REA UC RO OR 6 Install aHofi D dU 8 10 Ethemet Commi Sup edat odds eh bd 11 CSO tA EU ALE ONG 13 13 Config raton slave 14 mt aralre samen ania D NR FU rur 16 Polls Gon Par Dig e eee Te has Rd tte ve br A Ee eot d 16 A Parc etae cocta Ud A MS IVa UM HA CAO NOM 18 ci AINE RR E MM TR REN 18 iata Cross The atid 19 Specal Case Applications 20 Advanced OIE PES 22 Priority gt Event Polling Managing TCP
4. l ASC ee totocol II _ Read wite Buter Size 40 Bytes Read Write Buffer Size 140 Bytes Termination Character 1 87 2 sr 22 Append Character 1 se 2 v Termination Character 1 7 2 FF Fx Append Character 1 r 2 P Delete Mode Ignore Delete Mode Select Ignore C Printer Figure 6 INSTALLATION ETHERNET COMMUNICATION RSLogix 5000 ModbusMaster in ModbusMaster 11 19 ACD 1756 1 55 Modbus_Interface MainRoutine Bf yew Search Logic Communications Tools Window SETUP O amp x 6 te All 7 If you using TCP IP you should add the Mim aT 02 142172 17 a appropriate 17XX EWEB module 17xx modules will NOT serve the Barro at purpose of the instruction If you do not n EI have this module already installed right click on the option JO Configuration located on the ee left hand side and from the menu choose New Module Figure 8 This example assumes a ControlLogix CPU with 1756 EWEB module For other PLC CPUs use equivalent EWEB module End eee lech Module Click on Communications module and Desorption select the 1756 EWEB module 1756 DHRIOJD 1756 DH Bridge RIO Scanner Allen Bradley A 1756 DNB 1756 DeviceNet Scanner Allen Bradley 2 1756 EN2F A 1756 10 100 Mbps Ethernet B
5. a Mew Search Loge Communications Tools Window Heb our PLC a lication ci i vir lel EL XL E This is a recommended option for installa F BAT 4 2 2 i nia REGE on Go to the area in your program were you want to add the instruction Right click on the selected rung and from the popup menu click on the option Import Rung see Figure 2 window will open and will let you browse for the instruction import file Parock1 L5x After the file is found click on the button Import The window Import Configuration will i Yo Configuration E 1756 Backplane 1756 A10 1 1756 EWEB A ewes B 2 1756 dis Ethernet e popup displaying all the tags as seen on Add Ladder Alt Ins Figure 3 This tags can be renamed however this user manual assumes default tag names Alias For Datatype Description Operation Par_H_Data Use Existing Code_Action DINT Code_Error DINT Data Xref Par_Data_Xref Par AcceptMsg MESSAGE Par CreateSockMsg MESSAGE Par data INT 150 Par Del llMsg MESSAGE Par Del5ockMsg MESSAGE Par MessageData 40 Par penConnMsg MESSAGE Par ReadBuf Par ReadPara Par ReadMsg MESSAGE WiiteBuf WiitePara Par WiiteMsg MESSAGE ParModbus PARMODBUS Pall Par Poll Info 1 Sla
6. Feedback is always welcome from the user community and clients If you need any special fea ture added or any other comments about this product please advise us Contact us at Parijat Controlware Inc 9603 Neuens Rd Houston TX 77080 Phone 713 935 0900 Fax 713 935 9565 sales patijat com Www parijat com Standard tech support is provided via telephone and e mail for products purchased charges may be incurred in some cases TECH SUPPORT Contact Info Phone 713 935 0900 Fax 713 935 9565 pci support Z patijat com www parijat com Acknowledgments Parijat acknowledges any amp all trade names or trademarks used in this document as belonging to their original owners Any use of any registered trademarks etc herein is purely for reference only amp no harm to the owners intended DISCLAIMER Due to the vast majority of varied applications PLCs and Modbus can be used for 34 party ven dor s devices talking various flavors of Modbus Parijat assumes no liability whatsoever by the use or mis use of this product in any applications made by the user The user is encouraged to fully test it before de ciding that it serves their needs well before deciding to purchase it and finally applying it to their applica tions Time limited trial evaluation versions are available from Parijat Since there is no practical way to limit the range of values written into the instruction s variables some values com
7. R W Selects the mode of data processing moving Applies if the option is bought More details in the advanced section e 12 Processing RO Lets the user know that there is processing going on for this poll e 14 32 bit Data Type Address R W The current data type is 32 bits e 22 Priority R W It shows if it is priority Poll See details in Priority section e 23 Event R W shows if it is an Event associated POLL See details in Event section e 29 Active R W set it for the POLL to start working CommEff RO Current period instantaneous Comm Efficiency Since beginning to now CommEff_Last RO Shows the efficiency of the last period TimeEff RO Current period s Comm Time Efficiency since beginning period to now TimeEff_Last RO Last petiod s Comm Time Efficiency Try RO Total tries in current period since beginning gt gt o o qo Try Good RO number of Good tries in current period CONFIGURATION PAR DATA Par Data INT type is an 16 bit array you can use as global data repository Your application can read or write data from this array If certain data elements overlap per definitions in the poll members then the results of the contents will be governed by last actions It is not recommended that you stuff analog integer data amp Boolean digital bits data in the same word that is part of 2 different polls for updating Both internal and external slaves rely on this array for d
8. UNITE 05 FUTURE ACKNOWLEDGE 06 FUTURE SLAVE DEVICE BUSY 07 FUTURE NEGATIVE ACKNOWL EDGE 08 FUTURE MEMORY PARITY ERROR 16 ILLEGAL FUNCTION CODE IN MES SAGE 17 CRC BCC ERROR IN RECEIVE MES SAGE 18 TIMEOUT BEFORE GOOD RE SPONSE 19 MB MASTER PRIMARY amp SECOND PORT FAILURE 20 MBMstr NO SLAVE FOUND TO POLL FATAL ERRORS A Fatal Error aborts the current transaction and is reported in Code Error and also in transaction history log if logging is enabled Keeping logging on does not have noticeable impact on 21 SCATTERED MODE WITH BOO LEANS 22 ILLEGAL DATA ADDRESS IN TRANSMIT SCATTERED MODE 23 ILLEGAL DATA ADDRESS IN RE CEIVING SCATTERED MODE 24 ILLEGAL ASCII MODE SELECTION 25 ILLEGAL USER ACTION CODE RE CEIVED 26 ILLEGAL RTU ADDRESS IN RE CEIVED MESSAGE 27 ILLEGAL RTU ADDRESS IN POLL 28 ILLEGAL POINT QUANTITY 29 ILLEGAL HOST REGISTER ADDRESS IN REQUEST 30 ILLEGAL SLAVE REGISTER ADDRESS IN RESPONSE 31 POLL amp SLAVE TYPE 32 BIT MIS MATCH 32 NO TCP CONNECTION AVAILABLE 33 ILLEGAL IP ADDRESS 34 BOTH MASTER amp SLAVE SELECTION FOR SERIAL COMM ERROR CODES SERIAL PORT ERROR CODES 62 THE MODE WENT OFFLINE 63 THE CTS SIGNAL WAS LOST DURING COMMUNICATION 64 THE SERIAL PORT WAS IN SYSTEM MODE 70UL BIT WAS SET PREMATURE TERMINATION 72 PLC CHANGED FROM RUN TO PROGRAM MODE DURING EXECUTION 73 BUFFER SIZE OR ECHO MO
9. IP 25 Configure multiples slaves with different properties 26 Priority poll action that can be dynamically set up changed by user logic 27 Scattered read write of contiguous data from to slave on per poll basis Limited by PLC memoty only Data Repository 16 bit registers 758000 Any PLC memory limitat Single internal OVERVIEW Optional adapter RS232 422 485 PAROCK I instru Devices Master and or Slaves instruction pe need you QUICK SETUP In most cases a cross RS232 cable is used for single point to point communication For long distance runs and multi drop scenarios RS422 and RS485 communication is used with the appropriate converters and wiring Consult your converter s manual for installation and setup details You may configure the following items for the instruction from either RSLogix5000 or Parijat s PA ROCK 1 configurator application To setup the instruction for use update or enter the following data as instructed below The following steps apply to the PAROCK1 configurator application Using Serial Configure the controller s channel 0 serial parameters via RSLogix5000 to suit your needs for baud rate parity etc The mode on the serial port tab under controller properties must be set to User Using TCP Configure the EWEB module through RSLogix5000 or RSLinx per Rockwell instructions this usually only involve
10. master and slave support via TCP IP Powerful TCP connection engine technology to efficiently manage and support TCP communication Extremely low overhead on PLC memory and scan time Quick start up and dynamically change configuration No duplication of data Normalized design Automatic continuous diagnostics access to your logic and communication time calculations SOK BOOST sel Qro uen NDS View transmit receive messages online Unlimited quantity of slaves supported for Master ja a Unlimited quantity of polls supported for Master Enormous size of data storage to 758000 16 bit registers 9 Prioritized and event polling Automatic scattered or continuous data moves for read write Redundancy path support for communication to external slaves Custom Private Modbus function codes support in addition to Public FC 1 2 3 4 5 6 15 16 l Control and manage polls for failed slaves oo Uses native Rockwell hardware no 3rd party HW like Prosoft Molex FieldServer etc Nel Fine tuning of system can be very conveniently done 20 Unlimited polls 21 User Defined Custom Function Codes supported up to 128 22 Setup polls as FC s or on action types 23 Configuration is a part of the PLC program no need to reconfigure HW when changing hardware 24 Unlimited slaves via TCP
11. other PLC This option is available however once you move the You MUST save the PLC project software to another PLC the license will be moved to the new after this activity PLC leaving you with a demo version on the previous PLC from where you removed the license OPTIONS Serial Master via Channel 0 This is the basic option for the instruction It works as a Master supporting external slaves polling TCP via EWEB Supports TCP IP communication Slave It works as a Slave being polled by external masters Redundancy This option only for TCP IP based systems allows you to specify a secondary IP address and port number for external slaves If there are any errors problem detected with communicating with that external slave the secondary IP address Port number is switched to after an error is reported Every poll the instruction attempts to communicate using the primary path if it succeeds that path is resumed or used else the secondary path is used If both fail an alarm is generated This option does not apply to internal slave The IP addresses should be part of the domain of the associated EWEB module More than 5000 registers Supports for more than 5000 registers for the global repository The upper limit is dictated by the PLC model amp its memory Typically a 1 5M limit is set for Clogix processor that translates to a maximum of about 758000 16 bit INT registers CFC support Custom Priv
12. started 2 Insert the PAROCK1 CD in the CD ROM drive Set up wizard starts automatically It Setup Wizard does not start 1 Double click the My computer icon 2 Double click the icon for the CD ROM drive 3 Double click PAROCK1 EXE Actual description of the PAROCK1 configurataor software application is later in the usual manual ASSUMPTIONS made about the Audience for this product amp manual 1 Reasonably familiar with MODBUS Learn mote from www modbus org 2 Reasonably familiar with Rockwell Allen Bradley ControlLogix 1756 CompactLogix 1769 or FlexLogix 1794 PLC CPU family and RSLogix 5000 products Learn more from www ab com 3 Reasonably familiar with basic Serial and TCP IP communication contact Parijat for more informa tion and PLC programming concepts pci support parijat com 4 Familiar with Microsoft Windows 2000 and later editions Also know how to use install and ma nipulate Windows applications INTRODUCTION Parijat Controlware is very thankful to you for the opportunity to serve your needs PAROCK1 is an add on instruction the instruction developed for Allen Bradley Rockwell Logix family processors with firmware version 16 or later Contact Parijat for older versions solu tions It provides an interface to external devices talking industry standard Modbus protocol in its vari ous flavors via Channel 0 ot Rockwell 17xx EWEB modules for TCP IP hardware interface For di r
13. Applies to both internal and external slaves 0 Port Pri R W The TCP Primary Port Number For external slaves only 0 Sec R W Specify the Secondary TCP Port Number For external slaves only 0 TimeOut R W Time out is measured in milliseconds For Internal Slaves it is process ing time allocated for that slave and for external slave it is timeout If this is set for less than the maximum PLC scan time then the actual delay is about less than 2 current PLC scans It is recommended that this should be about 3 times the maximum PLC scan time Status Bits Bit numbers are provided with description e 1 Healty MBmstr RO Slave is healthy e 2 Addressing Base 0 1 R W Minimum register coil address is 0 or 1 e 3 0 ASCII 1 R W Determines the MB type of the POLL 0 for RTU or 1 for ASCII e 4 Serial 0 TCP IP 1 R W Determines if it is Serial or TCP IP e 5 MBTCP 0 Embedded TCP R W Determines whether the POLL is MBTCP 0 or if it is Serial MB Embedded in TCP 1 Embedded TCP allows you to deal with a serial Modbus message embedded within a TCP packet or envelope e 6 Swap Words non Boolean Lo Pri R W For 32 bit data it would use IEEE 32 format 0 or not 1 and applies only to non Boolean operations e 7 Swap Bytes non Boolean Hi Pri R W For 16 bit data function codes whether to swap 1 the bytes or not 0 Bytes are 8 bit grouped e 8 Enable Swap R W Enable
14. Bytes or Word swapping e 9 Try only 1 poll if fail MBmstr R W This option will try only one poll if any of the polls for this slave fails More details provided in Advanced section e 10 Ext 0 Int 1 Slave R W Selects an external or an internal slave CONFIGURATION SLAVES LIST e 11 Redundant Port Avibl Mbmstr R W Is only for master If Redundant port is available on the external slave and the option is purchased Refer to Ad vanced Concepts section e 12 Processing RO Lets the user know that there is processing going on for this slave now e 14 32bit Data type Address R W The current data type is 32 bits e 24 Tried once MBMstr RO This poll has already been attempted for the current cycle Refer to Advanced Concepts e 25 Faulted Mbmstr RO A fault detected with any poll of this slave e 29 Active R W Set it in order for the this slave to start working CommEff RO Instantaneous Comm Efficiency from beginning of period to now CommEff_Last RO Comm Eff Of the last period Seq Step RO This is for the internal use shows the current step in the sequence gt o o Try RO Total tries in current period Try Good RO The number of good tries in current period IP Address Pri R W The desired IP address for primary port of Slave The IP address should be part of the domain of the associated EWEB module IP Address Sec R W The desired Seco
15. DE PARAMETERS CHANGED DURING EXECU TION 74 THE ACL INSTRUCTION EXECUTED AND STOPPPED OR REMOVED THIS OF INSTRUCTION 75 USER MODE TO SYSTEM MODE CHANGED TCP ERROR CODES 91IP ADDR OR PORT BAD 92 FAILED TO CREATE SOCKET 93 OPEN CONNECTION TIMEOUT OR REJECTED 94 FATAL CONNECTION OPEN ERROR 95 READ ERROR 96 WRITE ERROR NON FATAL ERROR MESSAGES Non Fatal error is informational only and transaction continues It is also reported in code error and in transaction logging 110 TCP PORT SWITCHED 111 TCP MESSAGE ID MISMATCH ACTION COMMANDS The action commands are issued from Action Codes tab on Configurator or via your applica tion logic You should click on the appropriate tab to refresh the display of the Configurator For invo cation via your application logic use the Code_Action tag in the PLC to load these commands given in the bullets below The result of this action is returned in the Buffer array Codes 1 2 are continu ously updated subsequent to invocation Codes 3 4 5 are one shots actions only 01 TRANSMIT MESSAGE BYTES The data being transmitted out by the instruction is displayed 02RECEIVED MESSAGE BYTES The data being received by the instruction is displayed 03 SYSTEM DATA USER DINTS The system data is read displayed It also allows you to change some of the system data The following desctibes each wotd contents 0 Future 1 R W I
16. ONS If transaction logging is on this shows related data for that transaction The pointer in system data desctibed in Action Commands points to the last member that was updated in this circular buffer You can create as transaction UDT members Slave It determines what Slave is being used Poll FC Poll ID for external slave amp function code for internal slave Error Code 0 means good and non zero is the error code Transaction Time It shows the time for the transaction in milliseconds CONFIGURATION DATA CROSS REFERENCE This is used with scattered mode and is not available for Boolean function code 1 2 5 opera tions For each poll you define the source index the destination start address as a Xreference Poll It defines the poll ID Source the 0 based Source Register index For reads from ext slaves refers to read block in slave For writes it refers to global data repository Destination the 0 based index for destination array For reads from ext slaves it refers to global data repository amp for writes it refers to slave data block Quantity It shows the quantity of registers Minimum value is 1 maximum is whatever allowed by the max quantity for the related poll If you enter illegal data unpredictable re sults may follow More than 1 entries are allowed for any poll The members for a poll do not need to be con secutive or in any order The executio
17. action Transaction This section is 22 PAROCK1 Configurator read only It will show transac Error code tions if transaction logging is set PLC IP Address 10 1 1 216 Sp 9 Demo Trial Mode to on If not it shows the last Click on the Tab to refresh data transactions history Tf set it Utilities Slaves Polls Sys Data Data X ref Transaction ParData Product Registration shows what slave is being used the poll for ext slave the function code that is being used for internal slaves the Error Code if any and the Transaction w cn Time The transaction pointer a o o oro c we EN System Data points to the mem ber last updated um E m e de E e iem Figure 20 PAROCKI Configurator Par_Data Figure 21 shows Par Data the contents of Par_Data ar ray the global repository of uset data Error code CRC BCC Error in Recv Msg PLC IP Address 10 1 1 216 Slot 9 Demo Trial Mode OFF Click on the Tab to refresh data Utilities Slaves Polls Sys Data Data Xref Transaction ParData Product Registration Product Registration Use this section of the application to register your product with Parijat and also to know what options are currently installed The instruction 15 always
18. allation section This is a more involved way for installation than the first one amp is more prone to errors problems INSTALLATION SERIAL COMMUNICATION SETUP For ETHERNET COMMUNICATION SET UP proceed to next page for instructions Oth erwise for SERIAL Configuration follow these steps using RSLogix5000 fo Controller Properties ModbusMaster Channel 0 Configuration set up and Date Time Advanced SFCExecution File Redundancy Nonwolatile Memory Memory General SerialPort System Protocol User Protocol Major Faults Minor Faults installation Mode Val On the Serial Port tab the mode has to be set to ee User The other settings can be configured accord ing to your needs In the example shown E Figure 5 the settings are as follows Stop Bits ContiolLine No Handshake 2 Baud Rate 38400 Came amp Data Bit 8 BTS Send Delay 0 20 ms ATS Off Delay 0 x20 ms Parity None DCD Wait Delay 51 sec Stop Bit 1 Control Line No Handshake RTS Send Delay 0 RTS Off Delay 0 These settings must match the settings of the ex ternal device s o Controller Properties ModbusMaster On the User Protocol Tab the settings Date Time Advanced SFCExecution File Redundancy Nonvolatile Memory Memory General SerialPort System Protocol User Protocol Major Faults Minor Faults have to be as follows
19. ata The instruction reads and writes data from this array as it deems fit and when it deems fit Typically this action is performed when read or write action has to be executed As such the last or current contents of the array are used In time sensitive applications you may monitor the processing bit before reading or writing to the ap propriate members of this array In master mode the instruction keeps the appropriate members of this array updated as the instruction reads data from the external slaves It reads data from the appropriate section of this array when write operation has to be performed any external slave In slave mode any external masters reading data access this array The external masters write data into this array Any Boolean Modbus function code operations are always handled as packed bit operations Each member of this array supports 16 consecutive bits The bit number increases from the 0 bit LSB of the base word to 15 bit MSB in the base word to higher bit addresses in the adjacent in creasing words You may deal with up to 2000 contiguous bits in a single Modbus transaction Suppott for 32 bit type data is provided by using 2 adjacent registers You may treat it as an integer or floating point data Byte level and word level swapping is supported String type data shall be handled by your application packing up to 2 byte characters 8 bits each in one 16 bit members of this array TRANSACTI
20. ate Function Codes See Advanced Concepts section for more information Scattered Mode See Advanced Concepts for more details Site License Allows you to have unrestricted copies for your site Bundled with EWB module You may also procure the PAROCK1 from Parijat bundled with appropriate Rockwell EWEB module Support Agreements available for this product Contact Parijat for further details FUNCTION CODES SUPPORTED 01 Read Coil Status Reads the ON OFF status of discrete outputs 0X reverence coils in the slave 02 Read Input Status Reads the ON OFF status of discrete inputs 1X reference in the slave 03 Read Holding Registers Reads the integer contents of holding registers 4X references in the slave 04 Read Input Registers Reads the integer contents of input registers 3X references in the slave 05 Force Single Coil Forces a single coil OX reference to either On or OFE 06 Preset Single Register Preset a value into a single holding register 4X reference 15 OF Hex Force Multiple Coils Forces each coil OX reference in a sequence of coils to either ON or OFF 16 10 Hex Preset Multiple Regs Preset values into a sequence of holding registers 4X references DIAGNOSTICS Serial Channel 0 or TCP Embedded You may need 5232 hardware handshaking troubleshooting hardware to verify your cable witing Typically a cross serial cable is
21. bination may result in unpredictable behavior User is urged to test their application in a laboratory environment using various possible range of values for various variables before releasing it into the production target Also since this instruction deals with communications several outside factors also influence the performance Typically it takes more than one PLC scan for this instruction to complete any assigned or ongoing task s Any changes made to the data configurations while a related task is in progress can have an undesirable impact on the results and related process equipment operation unless done cautiously as described in this manual Serious damage to equipment and personnel may result if appropriate testing is not done of your total application using this instruction before releasing for production target Parijat assumes no responsibility for any of these consequential or other damages Parijat shall fix any bugs reported to Parijat in a reasonable manner and in some situations special case discussions may need to be entertained
22. ect serial interface you may use properly configured Channel 0 For TCP IP EWEB module is re quired however via TCP IP switches and commercial TCP to serial adapters this may support several serial communication ports and TCP IP devices If you are using serial to TCP adapters then the hardware communication port settings of the adapter must match with the serial Modbus devices set tings for a successful project execution The instruction does not play any role downstream of TCP to serial adapter s TCP port IP address for hardware interfacing Use your adapter s and Modbus de vice s user manuals to ensure compatibility Endless possibilities exist for your applications with this concept It can be a Modbus master polling several external slaves and or it can be a Modbus slave being polled by external Modbus master devices One instruction supports only one EWEB module You may share the same Par_Data the array in the PLC that is the global data repository for all Mod bus transactions array amongst as many instructions by judicially demarcating regions in the array You are responsible for managing the use sharing of this resource An external slave is a Modbus device physically external to the PLC system that shall be polled for reading writing of data by the instruction In this case the instruction may also be called working as a Modbus Master You may have as many external slaves polled the PLC model s limits apply An i
23. ent connection throughput Each external MB TCP slave and each TCP serial adapter s IPaddr port combination consumes a TCP connection from EWEB For internal TCP slave one connection is used for the listen port amp each external TCP master consumes a connection A connection is automatically dropped for communication inactivity time of over contiguous 5 minutes or so ADVANCED CONCEPTS Scattered read write This feature only for external slaves multi register non boolean operations e g func tion codes 3 4 16 allows you to read write data in a scattered way into global repository When you read write data it is sent received as a contiguous block of data ordinarily This feature also allows you to distribute the read data from or data to write to external slaves into non contiguous blocks in Par_Data The scattered feature is configured using the Data_Xref UDT described later The con tents must be within the legal ranges of arrays configured in the PLC system otherwise unpredictable operation may happen including a CPU fault If gaps exist in the data range that data in destination defaults to 0 or no change refer to Data Xref UDT for more details If overlap exists the last action prevails It is recommended that you use Parijat Configurator to configure this feature The instruction processes the data using Data_Xref from element 0 to the top seeking the Poll ID poll that is be ing currently processed The S
24. erably use one shot type method to set the priority event flag bits where appropriate Before invoking a normal poll the instruction evaluates to see if any priority or event poll is scheduled It finds it by start ing X from the 0 member proceeding to the last member in the poll UDT As it executes the prior ity event poll the appropriate flag in that UDT is cleared After the last priority event poll is finished the instruction resumes from that member onward for its normal polling This may result in missing some of the normal polls of current cycle that may be interspersed in between one or more of the priority or event polls Managing TCP Connections Parijat designed unique method to manage multiple TCP connections for the EWEB module This allows the PLC to dynamically and very efficiently add and drop TCP connections for devices outside the EWEB module As new device s try to establish connections with the EWEB module appropriate resources are allocated for the connection If a connected device decides to drop out or disconnect for whatever reason the resources are automatically de allocated There is a max limit imposed by EWEB on the quantity of simultaneously active connections If this limit is reached new device connections are denied This also regulates the flow of queries and responses between various devices and the PLC This allows for the maximum use of what is available from the EWEB module and provides the most effici
25. ist Slave List a window similar to Figure 11 Go to the Com 42 munication tab browse for the EWEB module Data Xref Data Xref and click OK to accept Buffer Buffer Par Par CreateSockMsg Par_DelAllMeg Par_DelSockMsq Par OpenconnhMsg Par Reads Par Accepts Par CreateSockMs Par Dells Par_DelSackMs Par OpenconnMaag Par Reads Repeat the operation for each ellipses in the instruction Par Par Par Par ReadBu Par VWritsEluf Par VWriteBuf Par MessageData Par MezssageDsta Message Configuration Par AcceptMsg Configuration Communication Tag Path EWEB Browse EWEB nunication Meti f od Channel Enable Enable Waiting Start Error Code Extended Error Code Error Path Error Text Done Length 0 Timed Out ox A CONFIGURATION The instruction uses several user defined type UDT variable structures to support itself Do not modify the structure layout of these UDTs as an unpredictable behavior may result You may however rename these UDTss to suit your needs The user manual is assuming that the default names are not changed Some of the members are read only and you should not make any attempt to write into these read only members data via your PLC application as absolutely unpredictable results may follow It is highly recommended that the members that are wri
26. l Figure 15 PAROCKI Configurator Polls Allows you to setup Polls slave data The various fields PAROCK1 Configurator CRC BCC Error in Msg are described already You may click on the status field to have a pop up shown that de Error code 10 1 1 216 9 Demo Trial Mode PLC IP Address Click on the Tab to refresh data Utilities Slaves Polls Slot scribes each bit for read or UU Ue um EE Start amp ddr Host amp ddrSta Status 14 0 0 33558544 write operation also 3 gt Polls Status Bits Polls Status Bits e QRAW 0 FC 1 Action 1 CFC Swapords SwapBytes cjojojojojojojo o c c ecjojojojojo jo jrs J 4 ecjojojojojojo jo o t T Oo fF Win Enable Swap 0 Cont 1 Scatterd Processing 32bit amp ddr ael o ro ol rol ecj ojojojojojojojojo ecjojojojojojo jo ecjojojojojojojojojoj o ecjo EE Priority Status Bits Figure 17 shows the description of Figure 16 16 each bit being used at the Polls Event Faulted Active Figure 17 PAROCK1 Configurator CRC BCC Error in Recv Msg Error code Sys Data It allows you to view or edit the following PLC IP Address 10 1 1 218 six 9 Click on the Tab to
27. l slave is beyond our control as so many vari ables play an active roll like media type physical distance noise external device s processing delays etc Once full message is received from external slave full processing is completed in one PLC scan An internal slave is always at the mercy of external masters At the end of every master poll if configured evaluation for internal slaves is done Any requests from external masters is processed before scheduling next poll A serial channel 0 internal slave may consume 2 3 PLC scans for processing this amp sending the response to the external master The TCP internal slave may consume mote scans to process this request from each of the external mas ters who have pending requests If no pending requests are there for the internal slave system waits for the inter poll delay before invoking next poll For this reason the external masters rate of activity amp their quantity typically determine the impact on the performance of the instruction on the overall PLC scan time Try only 1 poll Slave_List status 9 An external slave may have several polls configured in the instruction If a communication problem arises with this slave the instruction waits till timeout occurs This may impact the rest of the system turn around response In fact every poll for such a slave is going to wait for timeout delaying the rest of the system activity amp response If this presents response time problem i
28. n order is always from index 0 of this UDT to the high est for a certain poll You must verify that there are no overlaps amp user entered data is valid legal for your configuration Any gaps in data for reading from external slaves will leave the Par_Data unchanged Any gaps while writing to ext slaves will result in clearing the gap regis ter addresses to 0 The figure below illustrates an example of scattered write operation Utilities Slaves Polls Sys Data DataX tef Transaction ParData Product Registration 2 PAR DATA EXT SLAVI lt 1 lt 8 8 218 8 2818 2 8 0 1 2 3 4 A 5 7 3 Figure 12 SPECIAL CASE APPLICATIONS General Comments During dynamic configuration changes care should be taken when setting bits of interest in a wotd Poll amp Slave List status that other bits should not be affected You may also give a serious thought to changing other items that may be related in the same PLC scan These changes should only be enforced when processing status 12 bit in appropriate section is off clear INTER POLL DELAY VARIABILITY If your application needs a polling interval that varies poll to poll you can accomplish this by changing the inter poll delay before desired poll invocation This Instruction does not change the in ter poll delay So the last value of inter poll delay will prevail This may be a valuable tool if you need to conse
29. n your application you may set this bit By doing this the instruction shall only try to communicate with this slave only once in poll cycle The other polls shall be ignored till the communication problem is resolved This feature bit is not used by internal slaves Configurator Configurator also called 1 Configurator is a Microsoft Windows application to con figure or debug the It requires INET framework 2 0 or later After making any changes to the size of any arrays or configuration in the PLC related to PAROCK1 you may need to re launch the Configurator The UDT size changes are only read from the PLC at launch of the Configurator Error code Shows the last error code and its description from the instruction IP Address Enter the IP Address of the PLC Ethernet communication module This should generally be the same as you may use with RSLinx for your RSLogix 5000 application If the IP Ad dress is changed click on the Refresh button The last IP address is memorized Slot Number Enter the slot number where the PLC CPU is located Utilities E PAROCK1 Configurator U lities Yeallows you to ic Error code CRC BCC Error in Recv Msg voke commands and view the PLEIP Address 101 1216 Slot 9 Demo Trial Mode Click on the Tab to refresh data results in the Value section of grid on the left of the applica Action Commands Lets
30. ndary IP address for Slave The IP address should be part of the domain of the associated EWEB module Connection ID RO For the internal slaves and is for internal use CONFIGURATION POLLS POLLS You may have as many polls members as you want and each one allows you to define or configure polls for the external slaves Extend the UDT size in the PLC to suit your needs It also al lows you to monitor various status data about each poll 0 Slave R W Index into Slaves List It determines the Slave address being used 9 Function Code R W The function code that is desired to be executed The description of the Function codes supported is described later on the User Manual Start Address R W With Start Address you can select the desired address from where to statt polling points in the slave Quantity Points Qty Pts R W This part of the array lets you determine the number of points to be polled It is limited to 2000 for Boolean related function code operations It is limited to 67 16 bit integers or 33 32 bit data for serial channel 0 multi integer opera tions For TCP multi integer operations the limit is 124 consecutive 16 bit or 62 32 bit consecutive data registers o Host Address Start R W The Host Address Start is where you start reading or writing into the PLC program s Modbus global data repository Par Data For instance for read operation if the host address you have set to 10 that mean
31. nter poll delay for external masters in milliseconds 2 R W of periods for efficiency calculations 3 R W Start offset in Par Data for this instruction Defaults to 0 For large systems using multiple PAROCK1 instructions you may want to share the same data repository In that case you may demarcate the statting points in data repository for any instruction 4 Bits of this wotd are used as follows 1 R W Transaction logging control status 1 On 0 off 2 R W Clear Par_Data powerup of PLC This shall clear the full data repository 0 to highest word when PLC power on occurs In multi PAROCK1 applications sharing same Par_Datal this op tion set on any one of the instructions will affect the full range Careful analysis may be made of your system 3 R W Clear communication efficiency power up of the PLC 5 R W Listen Port for the slave Defaults to 502 You should clear this to 0 if no TCP internal slave used This shall improve the instruction s performance 6 Future 7 RO Transaction Pointer Index If transaction logging is on this returns the last index in Transaction UDT member that was updated 04 READ CLIENT INFO DINTS Shows the name address etc of the buyer client amp the date of purchase 05 REINITALIZE Allows you to reset the instruction Any communication related change that may affect the hardware warrants you to invoke this command before taking effect SUGGESTIONS
32. nternal slave is applicable when the instruction is being polled for read write by some physically external Modbus device s In this case the instruction may also be called working as a Modbus slave You can only have a single slave entity per instruction If more than one slaves con figured only the first one with lowest index in Slave List shall be in use the others shall be ignored For channel 0 serial interface only one external master may be applicable Theoretically you may have more than 1 external serial masters but that may result in unpredictable scenario unless these multiple external masters can ensure only one activity at a given time Also in channel 0 based serial systems you may not have both internal amp external slaves in use simultaneously Theoretically you may do it but severe practical limitations exist obliterating any practical use of this scenario Generally there is no reasonable way to guarantee the fact that an external master s request be treated as a response by the internal master or vice versa If you are using more than 1 instructions in a single PLC system you may use channel 0 serial interface only with one of these instructions Unpredictable results may happen otherwise Contact Parijat if any of the above conditions is affecting your application for alternative solu tions FEATURE LIST Contemporary Technology Simultaneous suppott of serial and TCP IP Simultaneous Modbus
33. ource address Src refers to the register offset address for the source The Destination address ID Dstn refers to the Register offset address in the destination The Qty range 1 124 is the quantity of registers for this transaction The scattered operation adds extra processing time to the operation Custom Private Function Code support Modbus function codes 1 2 3 4 5 6 15 and 16 are considered to be public The instruc tion supports all of these public function codes Also you may define your own user defined custom private function codes The approptiate option must be installed and purchased In the Poll Status wotd set bit 3 to invoke this Set the function code in Poll FC The rest of the data to create this message is used from the Host Address Start and Qty Pts as 2 ASCII packed characters from each 16 bit word in order ADVANCED CONCEPTS Dealing with Processing flag Bit 12 of Slaves_Data and Poll status member is 1 during the time that entity is actively in use by the instruction The ideal time to dynamically alter any related data for the polls or slaves should be done when this bit is 0 otherwise unpredictable results may occur Response time The instruction will try to execute amp complete polling a certain external slaves as a Master if any in 1 to 2 scans of the PLC before transmission of outgoing message The wait time for response to be received from externa
34. processing could result in an unpredict able result The active bit 29 allows you to configure different scenarios in anticipation and then en forcing these when appropriate dynamically The instruction also may be conditionally enabled disabled by your user PLC logic Period Cycle Used with internal master only The time consumed in completing a polling cycle starting with poll 0 to the highest poll is cycle time You may designate a quantity of cycles over which efficiency should be calculated for communication and time spent via Sys_Data in Action Commands This is called the period Two types of efficiencies are evaluated One is current or live from the beginning of period to now The other is efficiency of the last period Polling efficiency determines of good polls over total polls Time efficiency determines of actual transaction time spent as of timeout This may allow you to fine tune timeout setting CONFIGURATION SLAVES LIST Slaves_List The array for the Slaves lets you define or configure both internal and external slave characteristics It also allows you to monitor various status data about the slaves Create as many members as you need in your application R W refers to Read or Write RO is Read only ability of user program for that member This configuration will apply to all transactions for this slave Each member has the following entries Address R W Slave Address 1 247
35. provided in demo trial mode This time locked mode is a fully functional mode for the trial period of woo Vv oa a Win Figure 21 EXE about 2 houts after a program to run transition of the PLC You need to use the Parijat Configu Product registration rator application to unlock 3 PAROCK1 Configurator register the product as is shown Emorcode CRC BCC Error in Recv Msg in Figure 22 The registration is PLC IP Address 10 1 1 216 Slot 9 Demo Trial Mode done on a per PLC CPU basis Click on the Tab to refresh data Other options ate available Utilities Slaves Polls Sys Data Data X ref Transaction ParData contact Parijat for details Read Code 1962934030 Register After you purchase the product contact Parijat and provide the Lora Code to Parijat The sales person will provide you with the regis Master d Slave CONTROLWARE INC tration code 9603 Neuens Road Houston TX 77080 gt 5000 registers Phone 713 935 0900 You enter the registration code CFC support Fax 713 935 9565 http www parijat com sales parijat com Scattered Mode provided amp click on register ie Site License Product configuration will show the options you have currently installed in the PLC Read Op Next release To transfer the registration from a PLC to an tions section for more details
36. refresh data Demo Trial Mode Utilities Slaves Polls ata Xf Transaction ParData Product Registration Inter poll delay milliseconds Tries limit for efficiency calculation Start Offset in Par_Data Xsaction Inter poll delay Tries limit for efficiency call 8 8 D o Start offset in Par_Data Xsaction Logging On Clear Data Power Up Clear Comm Eff Power Up 6 68 Slave Listen Port Transaction pointer Logging On Clear Data Power Up Clear Comm Eff Power Up Slave Listen Port default is 502 and Transaction pointer All items are read or write except the transaction pointer The transaction pointer applies to the transaction history circular table or buffer Configurator Data X ref Data Xref used with Scat tered data option Allows you 3 PAROCK1 Co nfigurator Error code CRC BCC Error in Recv Msg PLC IP Address 10 1 1 216 Slot 9 Demo Trial Mode Click on the Tab to refresh data to set the scattered data con figuration Do not enter a number that points to non existent data in the PLC as unpredictable operation may result Refer to the Scattered data section for details oon nak aero or ror ro loro lo a Figure 19 Trans
37. required between the PLC and the other serial device You may contact Parijat for a Serial Comm Testing utility TCP If you do not have a need are not using a switch router use a cross Ethernet cable otherwise use a straight Ethernet cable Hardware troubleshooting tools available from Black Box B amp B Electronics etc may be used to verify cable and connections Then using a PC you should ping both IP addresses of master as well as slave To check the connections and types of connections use the built in Web server of the EWEB module Refer to Rockwell user manual The listen client and server ports should be active with correct IP addresses and port numbers displayed if not investigate The IP listen port defaults to 502 may be changed via system data settings is used by the internal slave to listen for external master communication activity All external masters must be configured to connect to this IP and port The refresh rate of the EWEB diagnostic page should always be greater than zero You may also employ products like WireShark to help you troubleshoot TCP IP communications Parijat also sells a Microsoft Windows based utility called Modbus Analyzer to aid in troubleshooting of Modbus networks ERROR CODES system scan time 01 FUNCTION CODE FC UNSUP PORTED 02 ILLEGAL REGISTER ADDRESS IN REQUEST 03 FUTURE ILLEGAL DATA VALUE 04SYSTEM FAULT NONFUNCTIONAL UNREGISTERED
38. ridge Fiber Media Allen Bradley When you click OK a window similar to 1756 2 1756 10 100 Mbps Ethernet Bridge Twisted Pair Media Allen Bradley 1756 1756 10 100 Mbps Ethernet Bridge Fiber Media Allen Bradley gure Iwill appear You need to fill up 1756 ENBT A 1756 10 100 Mbps Ethernet Bridge Twisted Pair Media Allen Bradley 1756 ENET A 1756 Ethernet Communication Interface Allen Bradley the name and a valid IP Address After 1756 ENET 1756 Ethernet Communication Interface Allen Bradle 5 OBTAIN PEL TE A OT RL EE E that this Module will be added to your 1756 5 SynchLink Interface Allen Bradley Controllers pt ogtam Digital Drives Figure 8 E Module Properties Local 1 1756 EWEB A 4 1 General Connection Module Info Configuration Diagnostics Backplane Type ede Mbps Ethernet Bridge w Enhanced Web Services Vendor Allen Bradley Parent Local Name EWEB Address Host Name PAddess 10 1 1 1 C HostName Slot p z L Revision fF 3l Electronic Keying Compatible Keying x Status Offline Cancel Apply Help INSTALLATION PARMCDBUS Parijat Modbus master Slave instruction Once you have finished configuring the 1756 EWEB module it needs to be linked to the PA 1 4 4 instruction ae Just click on the button and you will see Slave L
39. rve overall system communication bandwidth Different slave characteristics on same drop If external slave characteristics vary from slave to slave you may handle this situation by vary ing the status bits of the intended external slave before it goes in processing mode Any of the legal status bits or other variables in the Slave_list UDT may be manipulated The baud rate parity stop bits and other communication port hardware related configuration can not be dynamically changed on a given port be it Channel 0 or downstream ports on TCP Serial adapters SPECIAL CASE APPLICATIONS ADVANCED CONCEPTS This section is for more experienced users and may be used after comprehension Priority and event polling Priority Poll may be invoked by setting bit 22 of any active poll status word One or more priority polls may be invoked at any given moment Event polls also referred to as Demand polls are a group of significant active polls that may need to be executed in a succession associated with any event that your control sys tem detects or generates This may be accomplished by setting bit 23 of the appropriate poll s status word that are associated with this event Event polls have a lesser priority than the typi cal priority poll This feature should be used with caution as it affects the normal polling mechanism by delaying the normal polls till priority event poll processing is finished Pref
40. s setting the IP address In the configuration application configure slave information by entering data on the slaves tab configure slave poll information on the polls tab SLAVES IP Address For TCP slaves set the slave s IP address through RSLogix5000 Port_Pri For TCP slaves set the slave s IP port usually 502 Address Enter the slave s address Status Click on the cell under the status column to view the current status and set the bits according to your needs Mandatory bits set TCP Serial internal external slave enable bit suiting your needs POLLS Slave Select the slave ID to which this poll should be directed FC Enter the desired Modbus function code Start Address Enter the address of the first register to read or write Quantity Enter the quantity of registers to read write Host Address Enter the start index of Par Data the global data repository where registers will be read to or wtitten from Status Click on the cell under the status column to view the current status and set the bits according to your needs Mandatory bits enable bit INSTALLATION This section covers more detailed installation process of the instruction in your PLC program There are 2 ways to perform this 1 Importing the instruction into fs RSLogix 5000 ModbusMaster in ModbusMaster_11_19 ACD 1756 1 55 Modbus Interface MainRoutine 4
41. s that the data will be stored from index 10 in the Data array upwards For write operations the data to write to slaves will start at this index in Par_Datal array Status The following is the description of the bits in parenthesis e 1 Read 0 Write 1 R W Defines read 0 or write 1 action Works with action setting of status bit 2 only e 2 FC 0 ACTION 1 R W Defines whether field is used for function code 0 or an action 1 When set as action 1 set the memory type to operate on in the Poll FC property as follows 0 Coils 1 Digital inputs 2 Input registers 3 Holding registers e 3 CFC R W Sets if a custom or private Modbus Function Code is required Status bits 1 and 2 work with this option Specify the desired Function Code 0 to 127 For public function codes 1 2 3 4 5 6 15 or 16 it is not recommended to use although theoretically you may use it The additional data for the transaction is read from the Host Address Start and Qty Pts members e 6 Swap Words non Boolean Lo Pri R W For 32 bit data it would use IEEE 32 format 0 or not 1 and applies only to non Boolean operations e 7 Swap Bytes non Boolean Hi Pri R W For 16 bit data function codes whether to swap 1 the bytes or not 0 Bytes are 8 bit grouped CONFIGURATION POLLS e 8 Enable Swap R W Enables bytes or word swapping e 9 Contiguous 0 Scattered 1
42. table by your application may be writ ten to on a pulsed one shot basis This reduces overall application scan time and shall allow you to see if some other activity is inadvertently affecting your data in any way The instruction allows your application to modify the slaves and poll characteristics dynamically while the PLC application is run ning This may wisely be done and appropriate considerations like using the processing bit status 12 status must be taken as the instruction takes more than one PLC scans to complete its tasks If you want to dynamically change commsettings affecting the physical hardware such as changing IP ad dress port internal external slave type change bit 4 5 10 in slave_list status etc then a reinitialize command is also required described in the Action Codes section It is recommended that this type of dynamic switching be done in a monitored mode several times ensuring its satisfactory operation be fore releasing to the production target system This is important as the variable factors and other de pendencies impacts may be quite large You may also use active bit status 29 for slave list or Poll UDTs Unless this bit is set that slave or poll is not used by the instruction You may clear this bit make changes and then set it for any member of interest This again may be done when the appropriate member is not active in processing status bit 12 set Affecting a member that is
43. ve List Par Slave Inf Xsactions Par 1 Figure 3 INSTALLATION After you click on the screen Import Configuration the instruction will be added to the selected rung as seen on Figure 4 MainRoutine RSLogix 5000 ModbusMaster in ModbusMaster 11 19 ACD 1756 L55 Modbus Interface View Search Logic Communications Tools Window Hep alla 6 ale D FE E F RUN No Forces 3 HB ene a 9 Favorites Fan X m Controller ModbusMaster Controller Tags E Controller Fault Handler 8 Maintask C Modbus_Interface Program Tags MainRoutine E Unscheduled Programs Data Types User Defined 0 Strings E Add On Defined a MessageData Par MessageDota 3 Trends Configuration 1756 Backplane 1756 A10 0 1756455 ModbusMaster BJ 1 1756 EWEB A Ewes S B 2 1756 ENET B Figure 4 2 Copying the instruction into your PLC application Copy the instruction from another RSLogix5000 file into your program Create the UDTs and variables required manually in your PLC application Setup the IP related data as described in the main inst
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