User Manual for the HE693SNP900 and HE693SNP940
Contents
1. change all the network devices to only 1 stop bit 3 5 Port Handshaking The SNP900 940 provides two different hardware handshaking modes to provide for standard SNP configurations SNP COMPATIBLE MODE This mode is typically compatible with most SNP devices SNP900 940 asserts RTS when an ATTACH message with a valid address is received from the master device Thereafter SNP900 940 also begins to sample the CTS line assuming the master device drives this line for the remainder of the attachment When the CTS line drops SNP900 940 breaks the attachment and ignores all messages until a new attach sequence begins CHAPTER 3 OPERATION 20 AUGUST 1998 PAGE 18 Note NO CTS MODE The mode behaves as the SNP Compatible Mode with the exception that CTS is not monitored This is for SNP master devices which do not provide hardware handshaking In this case SNP900 940 assumes the attachment is broken when either the IDLE timer has timed out or a new attachment sequence has begun Do not select NO CTS handshaking mode in multidrop applications 3 6 SNP Timing Parameters Configuring a SNP network also involves setting up time out and time delay values IDLE TIME This specifies the amount of time which may pass after an attachment without receiving new messages before the slave breaks the connection This is a configurable value and is in terms of seconds Note that the master can optionally either increase this time or turn off2. SNP ID ComReq changes the SNP ID of the SNP900 940 slave device to a specified value the SNP ID of the PLC CPU is not affected This section discusses the structure of a ComReq and describes the use of Change SNP ID ComReg in particular For details on using communications requests refer the GE Faunc s User Manual Series 90 PLC Serial Communications GFK 0582C a Using a COMREQ Instruction A ComReg is initiated when a COMREQ Ladder Instruction is activated An associated Status Word reports the progress and results of the ComReq The COMREQ instruction has four inputs and two outputs ENABLE LOGIC 2 FUNCTION FAULTED COMMAND BLOCK POINTER RACK SLOT LOCATION K ag TASK NUMBER Figure 3 1 Comreq Instruction Inputs Outputs Enable Logic Control logic for activating the COMREQ instruction Command Block Pointer IN Location of the command block Command block contains additional information about the ComReq and can be located in any word oriented area of the memory R AI or AQ Rack Slot Location SYSID This is a hexadecimal value The value specifies the rack slot location of the SNP900 940 associated with this ComReq For example for rack 0 and slot 4 the value is 0004h and for rack 3 and slot 9 the value is 0309h Task Number TASK Set the Task Number to 1 PAGE 13 20 AUGUST 1998 CHAPTER 3 OPERATION FT Output In case of a WAIT mode ComReg FT o
3. SNP ID communication request WARNING This portis not intended for the transfer of series 90 30 system configuration data Logicmaster 90 support includes transfer of program and reference table data only Figure 1 1 Front and Side Views PAGE 7 20 AUGUST 1998 CHAPTER 1 INTRODUCTION Configuration of the port type associated serial protocol parameters and hardware handshaking is easily accomplished through either the GE Fanuc Hand Held Programmer HHP or LogicMaster 90 LM90 The SNP900 940 can be used with ALL Series 90 30 CPUs However the following conditions must be met 1 The SNP900 940 requires that the associated Series 90 30 PLC must be version 5 01 or greater for communication with any compatible SNP device 2 The SNP900 940 requires a version of 6 50 or greater for use with LogicMaster 90 CHAPTER 2 INSTALLATION 20 AUGUST 1998 PAGE 8 CHAPTER TWO INSTALLATION 2 1 Mounting Requirements The SNP Module is designed to plug into any 90 30 backplane slot For installation information refer to the 90 30 Installation Manual 2 2 Power requirements Table 2 1 Power Requirements IA SNP900 SNP940 Inrush 300mA 5VDC 3msec 350mA 5VDC 3msec 200mA 5VDC 300mA 5VDC 2 3 Module Installation Remove power to the 90 30 CPU Rack Install the SNP900 940 in a free slot Apply power to the PLC Configure the communication port parameters with the HHP or LM90 Connect the SNP master
4. coke eget its debe sabe ts dy 2 LIMITED WARRANTY AND LIMITATION OF LIABILITY 0 cee eeeeeeeeeeeeeeeeeeeeaeeeeeeaaeeeeeeaaaeeeeeaaanees 3 ABOUT PROGRAMMING EXAMPLES oore cece cece ee onana eee ee ee ee ae ASEET ARAE EEE EE EEN RE ES 3 TABLE OF GONTENTS caca aia TOETAN 4 GRAP TER ONE INTRODUCTION ceso catalina tata iaa tia 6 1 0 Product DescrHplONiuaiia R ANA TS 6 CHAPTER IWG INSTALLATION i355 creh Zee ancy fas ir dai 8 2 1 Mounting Requirement cceccsseeeeceneeeeceaeeeeeeeaeeeeeeeaaeeeeseaaeeeeseaaeeeeeaaeeeseaaneeeeeaaneeseeags 8 2 2 Power requirements reret en a n AE r AE ia Ka ai aa EA N KEA EA AAEE ARENAER AS 8 2 3 MOdUIG MNStAllatlOn ae a a A E A det Gnetade dead ceadee teas 8 2 4 Module Configuration cceceeeeeceeneeeeceeeeeeeceaeeeeeeaeeeeseaaeeeeseaaeeeeseaaeeeseaaeeeeseaaeeeeeeaaeeeeeaags 8 2 4 1 Configuration with the Hand Held Programmer cecceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeenees 8 2 4 2 Configuration with Logicmaster 90 seeren nnii i e ii 10 CHAPTER 3 OPERATION waco ines a a donee A evdes i eeesber yaw A a r paS 11 3 1 SNP Protocol casio ie a 11 3 2 9NP Identification 12 3 2 1 Changing SNP Dioni t cita d 12 338 Port Selec o ot rd eee asin 17 3 4 Port Parameters iii e ree 17 3 5 Port Handsnaking sicsscctseicsonsetctacnstitancnsecetannytesadeneptasadesnesancnteccsane RAAE AATRE EEA EENAA TER 17 3 6 SNP Timing Parameters er E AAE AAE A 18 3 7 Front Panel Diagnostic LEDS cssc
5. service The obligation of HE under this warranty shall be limited to the repair or exchange of any part or parts which may prove defective under normal use and service within two 2 years from the date of manufacture or eighteen 18 months from the date of installation by the original purchaser whichever occurs first such defect to be disclosed to the satisfaction of HE after examination by HE of the allegedly defective part or parts THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR USE AND OF ALL OTHER OBLIGATIONS OR LIABILITIES AND HE NEITHER ASSUMES NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR HE ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OF THIS SNP Interface Card THIS WARRANTY SHALL NOT APPLY TO THIS SNP Interface Card OR ANY PART THEREOF WHICH HAS BEEN SUBJECT TO ACCIDENT NEGLIGENCE ALTERATION ABUSE OR MISUSE HE MAKES NO WARRANTY WHATSOEVER IN RESPECT TO ACCESSORIES OR PARTS NOT SUPPLIED BY HE THE TERM ORIGINAL PURCHASER AS USED IN THIS WARRANTY SHALL BE DEEMED TO MEAN THAT PERSON FOR WHOM THE SNP Interface Card IS ORIGINALLY INSTALLED THIS WARRANTY SHALL APPLY ONLY WITHIN THE BOUNDARIES OF THE CONTINENTAL UNITED STATES In no event whether as a result of breach of contract warranty tort including negligence or otherwise shall HE or its suppliers be liable of any special consequential incidental or penal damages including but n
6. the timer completely MODEM TURNAROUND TIME This specifies the amount of time which must pass between the reception and transmission of a new message This allows for propogational transmission delays in SNP handshake mode This is a configurable value and is in terms of 10mSec Please note that the master can optionally increase this time MAX ACKNOWLEDGE TIME This specifies the amount of time which may pass after sending a message before an acknowledgment is received from the master before the slave breaks the connection This value is not configurable and is set to 1 Second Note that the master can optionally either increase this time or turn off the timer completely 3 7 Front Panel Diagnostic LEDs In RS 232 applications RXA and TXA will flicker when there is activity on the associated lines for the RS 232 port In RS 485 applications RXB and TXB will flicker when there is activity on the associated lines for the RS 485 port For modem applications RXB indicates a ring and TXB indicates a carrier detect For all applications the ATTCH LED indicates that the SNP900 940 has received a properly addressed attached message and is communicating with the master RB C O exa TXB C CD TXA ATTCH O Figure 3 2 Front Panel LEDs PAGE 19 20 AUGUST 1998 CHAPTER 3 OPERATION 3 8 Remote Modem Access SNP940 Only The HE693SNP940 module is designed to provide convenient remote programming data access for Series 90 30 PLCs v
7. to the appropriate port Start SNP master application Our oh gt 2 4 Module Configuration Before the SNP900 940 is connected to the SNP Master it should be configured with the appropriate parameters Either the GE Fanuc Hand Held Programmer HHP or LogicMaster 90 LM90 can be used to configure the parameters The SNP900 940 also requires a PLC CPU version 5 01 or later A CPU version of 6 50 or later is required for use with LogicMaster 2 4 1 Configuration with the Hand Held Programmer 1 Install the SNP Interface module into the PLC 2 Apply power to the PLC rack The PLC will perform it s power up diagnostics and a menu will appear on the Hand Held Programmer s display 3 Enter the following key sequence on the Hand Held Programmer DISPLAY KEYSTROKE COMMENTS 1 PROGRAM Press the MODE key to reach this screen 2 DATA 4 1 PROGRAM Press the 4 key a 4 will appear as the first 2 DATA 4 character in the display RO 00 PLC Press the ENTER key the display will now show KEY CLK OFF ENTER the PLC CPU status PAGE 9 20 AUGUST 1998 CHAPTER 2 INSTALLATION DISPLAY KEYSTROKE COMMENTS Press the DOWN ARROW key until the RO 01 EMPTY lt S slot number containing the SNP y Interface Module appears following the RO This example assumes the module resides in slot 1 therefore the DOWN ARROW key is only pressed once Press the READ VRFY key then RO 01 READ lt S READ enter ENTER This will cause
8. 016 gt gt ALW_ON T0004 s R0001 R0001 CONST 00001 END OF PROGRAM LOGIC PAGE 17 20 AUGUST 1998 CHAPTER 3 OPERATION 3 3 Port Selection Via the software configuration the user may select the RS 232 or RS 485 or modem port The HE6935NP900 940 does not allow simultaneous communication on multiple ports Table 3 5 Pinouts 9 Pin RS 232 Port 15 Pin RS 485 Port Signal Direction Pin Signal Direction Pin 1 DCD Always High Output 5 PWR 5VDC Power NA 2 mxo Output 6 RTS Output 3 RxD Iwt 7 GND NAA 4 NoConnection Na 8 CTS inut 5 GND Nna 9 TERM inut 6 DSR Output 10 RXD Input 7 CTS npt Por oo RXD Imput 8 ARIS Output 12 XD Output _ A A a Activity on these ports may be monitored by the LED s on the front panel See Front panel diagnostic LED s in Section 3 7 3 4 Port Parameters The user specifies the baud rate stop bits and parity of the SNP port SNP devices typically default to 19 2k baud Odd parity and 1 stop bit Modem applications utilizing the Logicmaster 90 dialer are restricted to 9600 baud no parity and 1 stop bit Note The SNP900 940 is unable to generate 2 stop bits when a parity other than NONE is selected This may or may not affect other devices on a network with these parameters If problems exist with this configuration
9. HORNER APG User Manual for the HE693SNP900 and HE693SNP940 SNP Interface Module Fifth Edition 20 August 1998 MANO0081 05 PREFACE 20 AUGUST 1998 PAGE 2 PREFACE This manual explains how to use the Horner APG SNP Interface Card for use with GE Fanuc Series 90 30 PLCs Copyright C 1998 Horner APG LLC 640 North Sherman Drive Indianapolis Indiana 46201 All rights reserved No part of this publication may be reproduced transmitted transcribed stored in a retrieval system or translated into any language or computer language in any form by any means electronic mechanical magnetic optical chemical manual or otherwise without the prior agreement and written permission of Horner APG LLC All software described in this document or media is also copyrighted material subject to the terms and conditions of the Horner Software License Agreement Information in this document is subject to change without notice and does not represent a commitment on the part of Horner APG LLC Series 90 and Logicmaster are trademarks of GE Fanuc Inc For user manual updates contact Horner APG Technical Support Division at 317 916 4274 or visit our website at www heapg com PAGE 3 20 AUGUST 1998 PREFACE LIMITED WARRANTY AND LIMITATION OF LIABILITY Horner APG LLC Inc HE warrants to the original purchaser that the SNP Interface Card manufactured by HE is free from defects in material and workmanship under normal use and
10. d 4 of new SNP ID A 41h B 42h Word 10 14130 3732 Characters 5 and 6 of new SNP ID 2 32h 7 37h Word 11 00000 0000 Characters 7 and 8 of Slave SNP ID null null Do not change For the Series 90 30 PLCs the SNP ID is restricted to a maximum of 6 bytes followed by a null character 0 The 6 bytes must be the ASCII characters 0 through 9 inclusive and upper case A through F inclusive A null SNP ID Character 1 0 is not allowed The Status Word R1 reports on the progress and results of a ComReq The memory address to which the Status Word is written by SNP900 940 is specified in the Command Block Word 3 and Word 4 Word 3 describes the memory type and Word 4 describes the offset within the memory type The offset is a zero based number For example when R1 is to be used for Status Word the offset is zero and when using R100 the offset is 99 Note the following points when interpreting the Status Word 1 SNP900 940 never sends a zero for the Status Word to the PLC CPU If the user program needs to know if the command is complete it can zero the Status Word before issuing the ComReq and then check for being nonzero 2 If the Status Word selected is invalid SNP900 940 ignores the ComReg and no status is reported 3 A status code of 1 in the low byte and 0 in the high byte indicates that the request was successfully completed 4 Non zero values other than 1 in the low by
11. gramming and data access but does not support configuration Revision C or later adds utilization of the SNP X protocol The SNP900 940 uses the SNP X protocol if the SNP handshaking option is selected and the device with which it is communnicating is utilizing SNP X Revision D or later supports the Change SNP ID communication request When an SNP master sends a request to a slave it must create a connection ATTACHMENT before it transfers the data If the master needs to communicate with another slave it must break the first connection and establish a different connection with the other slave SNP connections are established with the communication line BREAK signal and RTS CTS is used to maintain the connection Note If an external modem is to be used it must be able to support receipt and transmission of the BREAK character The SNP Read and Write Memory requests allow the master device to directly read and write memory in the PLC through SNP900 940 Any one of the read or write requests can only be directed to a contiguous group of a single memory type However SNP provides an additional type of request called Datagrams Datagrams offer the capability to read from several slave memory locations in a single request and provide significantly faster retrieval of mixed memory types from a slave device than from separate readings of each memory type Master devices use either of the two types of requests to access reference data Howe
12. ia telephone modem The SNP940 can only accept a call No dial out capabilities exist The following procedures must be followed for Logicmaster 90 30 dial up access 1 Configure the SNP940 module Due to limitations in the Logicmaster 90 telephone dialer the SNP940 must be configured for the following parameters a Modem port b 9600 baud rate C No parity d 1 stop bit e SNP Handshaking 2 Connect the Telephone Line to SNP940 module The Ry 11 LINE jack present on the front of the SNP940 is designed to directly accept a telephone line NOTE t is recommended that an external surge protector be installed on the telephone line to offer some protection against lightening strikes 3 Run the Logicmaster Auto dialer The Logicmaster 90 Dialer is accessible from the Logicmaster 90 Utilities entry from the main menu This program must be setup for the appropriate personal computer COM port baud rate parity and stop bits The configuration parameters in the edit menu must be configured to the following values a 9600 baud rate b 8 data bits c No parity d 1 stop bit The telephone number for any other SNP940 module s must also be setup For additional instructions see the Logicmaster 90 30 documentation from GE Fanuc 4 Dial the SNP940 After following the proper procedures as outlined in the Logicmaster Auto Dialer documentation initialize a telephone call to the telephone line connected to the SNP940 mod
13. ieii i A a a 18 3 8 Remote Modem Access SNP940 Only ccoooocccccnonocccononoccnononaconononnccnonnnnccnnnnnnccnnnnnnccnonnnncinns 19 PAGE 5 20 AUGUST 1998 PREFACE THIS PAGE INTENTIONALLY LEFT BLANK CHAPTER 1 INTRODUCTION 20 AUGUST 1998 PAGE 6 CHAPTER ONE INTRODUCTION 1 1 Product Description Congratulations on your purchase of the SNP Interface Module The HE6935NP900 940 SNP900 940 is a Series 90 30 compatible interface module which allows an additional SNP slave port to be added to any Series 90 30 PLC The SNP900 port may be configured for either RS 232 or RS 485 operation The SNP940 may be configured for RS 232 RS 485 or up to a 14 4k baud modem Note The SNP900 940 does not support radio modem operation The SNP Series Ninety Protocol Interface Module functions as an SNP slave module SNP900 940 expands the capablity of a Series 90 30 PLC to support multiple SNP masters SNP900 940 allows a SNP master device to access Series 90 30 PLC reference data as though it were connected directly to the PLC s SNP port SNP messages may access up to 10 000 bytes of data in a single request Datagram requests are supported up to a limit of 250 bytes per request Revision A of the SNP900 product does not support Logicmaster 90 communications Revision B or later supports Logicmaster communications for programming and data access Revision C or later adds utilization of the SNP X protocol Revision D or later supports the Change
14. ion Package from the Main Menu lt F2 gt Select the proper folder Choose I O Configuration from the Configuration Menu lt F1 gt Cursor over to the slot containing the SNP Interface module Select Other lt F8 gt and Foreign lt F3 gt The following screen should be displayed CMONOARWN gt IG l l l l l 1 hs Bra ia RR By A oy gt SERIES 98 38 MODULE IN RACK 3 SLOT E SOFTWARE CONFIGURATION Catalog FOREIGN FOREIGN MODULE Module ID Ej xI Ref Adr I6661 Byte 1 BHBBHHH1 Byte BB I Size 8 Byte 2 BBBBBBAA Byte 18 z B2 7Q Ref fdr Q6661 Byte 3 Byte 11 z iE z0 Size B Byte 4 BB Byte 12 C8 Al Ref Adr AIBBBL Byte 5 Bl Byte 13 68 AI Size A Byte 6 BB Byte 14 BB AQ Ref Adr AQBB1 Byte 7 B7 Byte 15 BB AQ Size B Byte 8 Bl Byte 16 68 Figure 2 1 Example Configuration Screen 10 Configure the l Reference Address of choice and the l size as 8 11 Cursor over to byte 1 and enter a 1 00000001 This signifies to the PLC that the SNP Module is an intelligent module 12 Bytes 5 through 12 should be setup according to Table 2 3 13 All remaining bytes should be set to 0 Table 2 3 Byte Setup Byte Value Definition 0 RS 232 1 RS485 2 modem h 1 60 Seconds in Hex h 0 255 0 2 55 Seconds in Hex Modem Turn around Time PAGE 11 20 AUGUST 1998 CHAPTER 3 OPERATION CHAPTER 3 OPERATION 3 1 SNP Protocol The Series Ninety Protocol SNP is a pr
15. oprietary serial communications protocol developed by GE Fanuc for communication between PLCs and related equipment The protocol is a set of rules that establish and maintain a communication link between an SNP master and SNP slave device SNP is typically a half duplex protocol that uses either RS 485 enhanced version of RS 422 or RS 232 electrical interfaces Both types are provided in the SNP900 940 SNP also allows serial communications characteristics to be varied such as baud rate parity and stop bits SNP devices are connected in direct point to point or multidrop arrangements For multiple drop configurations only one SNP master exists When multiple slave devices exist each slave is addressed by a unique SNP ID For the SNP900 940 the SNP ID is the same as that configured for the associated PLC In a multiple twisted pairs RS 485 multidrop configuration up to one master and 31 slaves can be supported Termination resistors need to be provided at each end of the cable matching the impedance typically 120 ohms SNP is a master slave protocol where the master device initiates all communications requests to which the slave device responds The SNP900 940 is an SNP slave device designed to respond to most data requests issued by the master LogicMaster 90 communicates with PLCs through SNP and Revision A of SNP900 940 does not support Logicmaster communications Revision B and later supports Logicmaster communications for pro
16. ot limited to loss of profit or revenues loss of use of the products or any associated equipment damage to associated equipment cost of capital cost of substitute products facilities services or replacement power down time costs or claims of original purchaser s customers for such damages To obtain warranty service return the product to your distributor with a description of the problem proof of purchase post paid insured and in a suitable package ABOUT PROGRAMMING EXAMPLES Any example programs and program segments in this manual or provided on accompanying diskettes are included solely for illustrative purposes Due to the many variables and requirements associated with any particular installation Horner APG cannot assume responsibility or liability for actual use based on the examples and diagrams It is the sole responsibility of the system designer utilizing the SNP Interface to appropriately design the end system to appropriately integrate the SNP Interface Card and to make safety provisions for the end equipment as is usual and customary in industrial applications as defined in any codes or standards which apply Note The programming examples shown in this manual are for illustrative purposes only Proper machine operation is the sole responsibility of the system integrator PREFACE 20 AUGUST 1998 PAGE 4 TABLE OF CONTENTS PREFACE ts ces cts cits teeth da Sanit sites centage ete detonate tt gad a engin oo abate abs eee dots
17. out value word 5 is not used Maximum Communication Time Word 6 In case of WAIT mode this value specifies the maximum amount of time the program should hold the window open when the communications module is busy For NOWAIT mode this value is not used Note Change SNP ID uses NOWAIT mode and maximum communication time word 6 is not used Data Block Words 7 134 The Data Block contains information related to a particular ComReq and depends on the communication protocol used Note For Change SNP ID ComRegq the next section describing the Command Block discusses the Data Block format PAGE 15 20 AUGUST 1998 CHAPTER 3 OPERATION C Change SNP ID ComReq Example The following information covers the Command Block for the Change the SNP ID ComReq using an example The SNP ID of the slave device in SNP900 940 is set to 12AB27 using a Change SNP ID ComReq kR1 is used to get the status of the ComReq Command Block Word 1 00005 0005 SNP Data Block Length Do not change Word 2 00000 0000 NOWAIT Mode Do not change Word 3 00008 0008 Status Word Memory Type R Word 4 00000 0000 Status Word Address minus 1 R1 Word 5 00000 0000 Not Used Do not change Word 6 00000 0000 Not Used Do not change Word 7 07002 1B5A SNP Command Number Do not change Word 8 12849 3231 Characters 1 and 2 of new SNP ID 1 31h 2 32h Word 9 16961 4241 Characters 3 an
18. te indicate errors In case of error the low byte provides the major error code and the high byte contains any applicable minor error code Table 3 4 below lists the possible error codes in case of the Change SNP ID ComReg error Table 3 4 Error Codes Error Description High Byte of Status Low Byte of Status Word Word Invalid SNP 1D Invalid request Word 7 of Note The first COMREQ issued to an SNP900 940 after PLC power up must be delayed the SNP900 940 cannot accept COMREQs immediately after a PLC application is started Itis recommended to have a delay of five seconds past the first scan CHAPTER 3 OPERATION 20 AUGUST 1998 PAGE 16 Refer to the following Ladder Program example using the Change SNP ID ComRea Ladder Program Example START OF PROGRAM LOGIC lt lt RUNG 4 STEP 0001 gt gt FST_SCN T0001 Si lt lt RUNG 5 STEP 0004 gt gt T0001 T0002 4 CONST 00050 R0002 00000 lt lt RUNG 6 STEP 0007 gt gt T0002 T0001 R CONST R0005 CONST R0012 00005 12849 CONST CONST 00000 16961 CONST CONST COMREQ 00008 14130 COMMAND CONST CONST BLOCK 00000 00000 CONST CONST 00000 00000 CONST CONST 00000 00000 CONST CONST 07002 00000 lt lt RUNG 7 STEP 00011 gt gt T0002 T0003 MOVE_INT s CONST IN N Qf R0001 R0005 00000 00001 00005 CONST 0002 CONST 00000001 lt lt RUNG 8 STEP 00
19. the program will not wait for a reply and the program execution begins immediately after sending the ComReq In case of WAIT mode the program will wait for a reply from the communication module to the ComReg The maximum length of time that the PLC waits for the response is specified in the Command Block as Idle Timeout Value If no response is received within the timeout value the program execution continues Table 3 2 WAIT NOWAIT Values Mode NOWAIT OT WAIT Note Change SNP ID uses NOWAIT mode CHAPTER 3 OPERATION 20 AUGUST 1998 PAGE 14 Status Word Pointer Memory Type Word 3 The Status Word is written into PLC memory at the location specified by the Command Block Word 3 and 4 The format of the location includes memory type Word 3 and offset Word 4 Table 3 3 Memory Type Memory Type Decimal Hexadecimal Discrete Input Table R_ Register Memory 8 8h Status Word Pointer Offset Word 4 Word 4 contains the offset within the memory type selected The status word is a zero based number For example when R1 is to be used for Status Word the offset would be zero and when using R100 the offset would be 99 Idle Timeout Value Word 5 In case of WAIT mode idle timeout value is the maximum time the PLC waits for the communications module to acknowledge the receipt of the request For NOWAIT mode the value is not used Note Change SNP ID uses NOWAIT mode and idle time
20. the PLC to VRFY read the SNP Interface Module The model number of the module will be displayed Enter the starting reference for the 8 f ENTER digital inputs l assigned to the 108 I module Press the ENTER key RO 01 SNP900 Pressing the RIGHT ARROW key will gt cause the first configuration parameter to be displayed RO 01 SNP900 108 1001 016 All of the additional parameters can be RO 01 SNP900 modified by entering the numeric data or PORT RS4 pressing the key then pressing O 485 gt ENTER Pressing the RIGHT ARROW key will RO 01 SNP900 cause the next configuration parameter BAUD RT 19200 to be displayed These additional parameters are described below and in greater detail in Chapter 3 Table 2 2 Configuration Parameters Additional Parameters Limits Options Port RS 232 RS 485 or modem Baud 300 600 1200 2400 4800 9600 14400 19200 Parity None Even and Odd See Limitations Stop Bits Handshake SNP No CTS Idle Time 1 60 Seconds Modem TAT 0 255 units of 10 milliseconds Certain fields will generate a CNF_ERR on the Hand Held Programmer if they are invalid for the mode of operation CHAPTER 2 INSTALLATION 20 AUGUST 1998 PAGE 10 2 4 2 Configuration with Logicmaster 90 Install the SNP Interface module as described in the PLC documentation Connect serial port of the pc to the PLC s main programming port Execute the Logicmaster 90 software Enter the Configurat
21. ule Once the CARRIER 9600 message is displayed on the PC screen exit the Logicmaster Auto Dialer and enter the Logicmaster Programming Package CHAPTER 3 OPERATION 20 AUGUST 1998 PAGE 20 5 Setup the Logicmaster Serial Parameters After entering the Logicmaster Programmer check the PLC Communications Serial Port Setup accessible from the Programmer Mode and Setup menu selection Make sure the COM port and serial parameters are correct 9600 n 1 Once these are setup properly Logicmaster is able to go ONLINE and offer full programmability The TXB light is constantly green in color The ATTCH light flickers indicating a properly addressed message and communications with the master Program downloads are not possible to the SNP940 if a device is in the Hand Held Programming mode and it is attached to the PLC Power Supply SNP port 6 Hang up After completing the programming task s exit the Logicmaster Programmer Package and select the Auto Dialer Hang Up option from within Logicmaster 90 Utilities WARNING Use of LogicMaster 90 for configuration purposes is not supported Use of the feature may result in undesirable effects such as loss of configuration and data
22. utput provides power flow to optional logic depending upon whether the ComReq was successfully completed Table 3 1 FT Outputs Not Active The COMREQ Instruction never passes power to the FT output in NOWAIT mode Note Change SNP ID uses NOWAIT mode and the power is not passed to the FT output b Command Block The Command Block contains the details of a ComReg The address of the Command Block is specified by the IN input of the COMREQ Ladder Instruction The address is in any word oriented area of the memory R AI or AQ The Command Block structure is placed in the designated memory area using an appropriate programming instruction The Block MOVE instruction is recommended The Command Block has the following structure Word 1 Data Block Length Word 2 WAIT NOWAIT Flag Word 3 Status Pointer Memory Type Word 4 Status Pointer Offset Word 5 Idle Timeout Value Word 6 Maximum Communication Time Word 7 134 Data Block Data Block Length Word 1 The parameter is the length of the Data Block portion of the Command Block The length is measured from the beginning of the Data Block at Word 7 not from the beginning of the Command Block Note In case of Change SNP ID ComReg the Data Block Length word 1 is always 5 WAIT NOWAIT Flag Word 2 This flag determines whether the PLC will wait for a reply from SNP900 940 to the COMREQ Ladder Instruction If the Command Block specifies NOWAIT mode
23. ver there are certain limitations on the SNP900 940 which restrict the amount of data the master device can access over the port with one request An SNP request is divided into several smaller packets however the largest amount of inclusive data which may be passed or requested in any single request is 10 000 bytes of data A single datagram request or response is limited to 250 bytes of data Master devices also use the logon request to attempt to access restricted level services such as changing the PLC run state clearing fault tables changing the SNP ID downloading programs etc SNP900 940 does not support this type of logon request and the associated restricted services If a logon is attempted an SNP error message 5 17 programmer is already attached will be generated While it is outside the scope of the manual to describe the actual SNP message protocol additional information can be found in the GE Series 90 PLC Serial Communications User s Manual GFK 0582 CHAPTER 3 OPERATION 20 AUGUST 1998 PAGE 12 3 2 SNP Identification The SNP900 940 responds to either a null address or the SNP address assigned the associated Series 90 30 PLC To configure the PLC or SNP address refer to the associated reference manual 3 2 1 Changing SNP ID The SNP900 940 supports the Change SNP ID Communications Request ComReq After the power up initialization the SNP900 940 module defaults to the same SNP ID as the PLC CPU The Change
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