Accessing Data on a Logix PLC with the ICC ETH
Contents
1. 4 f Monitor Tags A Edit Tags ls Figure 3 Viewing the PLCInfo Tag 4 The PLCinfo tag can now be accessed by configuring a Data Table Read Write service object on the ETH 1000 targeting the PLCInfo tag The Slot field must be set to 0 to correspond with the location of the controller in the Logix rack The Element Data Type is set to 16 bit signed to correspond with the PLCInfo data type of INT The Element Type must match the size of the tag s data type If the tag s data type is SINT then the Element Data Type must be set to 8 bit signed unsigned Likewise if the tag s data type is DINT the Element Data Type must be set to 32 bit signed unsigned Refer to the ETH 1000 User s Manual for more detailed information regarding configuration of EtherNet IP connection objects and service objects 08 07 2013 Rev 4 Page 2 of 6 EEC 1600 Aspen Commons Suite 210 Middleton WI USA 53562 Tel 608 831 1255 INDUSTRIAL CONTROL COMMUNICATIONS INC Fax 608 831 2045 Email sales iccdesigns com Method 2 PLC SLC Mappin The PLC SLC mapping method is achieved by mapping a Controller Tag to a File Number Once this is completed an ETH 1000 Typed Read Write service object can be configured to target the File Number and hence access the associated Controller Tag This method provides full read write capability from the ETH 1000 to the PLC memory In the following example in the controller at slot 0 we will create a2. EEC 1600 Aspen Commons Suite 210 Middleton WI USA 53562 Te 608 831 1255 INDUSTRIAL CONTROL COMMUNICATIONS INC Fax 608 831 2045 Email sales iccdesigns com Accessing Data on a Rockwell Automation Logix PLC With the ETH 1000 Ethernet Gateway The ICC ETH 1000 Multiprotocol Ethernet Gateway has the ability to act as a client to remote EtherNet IP enabled devices which include not only I O or low level slaves but PLCs as well There are two types of data transfer mechanisms that exist within the EtherNet IP protocol TCP IP based explicit messaging and UDP IP based implicit or I O messaging EtherNet IP explicit messaging is a point to point request response client server protocol typically used for unscheduled on demand information messaging On the other hand implicit messaging is a multicast unicast producer consumer protocol designed for scheduled control data transfer In ControlLogix parlance I O messaging is the transfer of I O data with an I O device in the I O configuration tree or the transfer of Tag data via a Produced Tag connection Legacy Rockwell Automation PLCs such as the PLC5E and SLC5 05 only support a subset of explicit messaging data on these units can be accessed from the ETH 1000 by configuring an EtherNet IP client Typed Read Write service object Logix PLCs such as the ControlLogix however support both explicit and implicit mechanisms Retrieving data from a Log
3. P connection objects and service objects i ee Cancel T Help Delete Map Tag Name m PLC 2 Mapping 08 07 2013 Rev 4 Figure 8 Mapping the SLCInfo Tag Page 4 of 6 1600 Aspen Commons Suite 210 aa Middleton WI USA 53562 OT Tel 608 831 1255 INDUSTRIAL CONTROL COMMUNICATIONS INC Fax 608 831 2045 Email sales iccdesigns com Method 3 Produced Tag Connection A Produced Tag connection allows another device the ETH 1000 in this case to make a direct connection to a tag in the PLC s database Like standard implicit I O data transfers these connections are class 1 cyclic multicast transfers The main difference is that rather than connecting to a predetermined I O assembly any tag in the PLC that the user designates as a Produced Tag can be accessed The user must select the Produced Tag option when creating the tag in RSLogix 5000 This designation makes the tag known to the PLC s Connection Manager as a potential connection target Note that it is only possible to share controller scoped tags Produced Tag connections use unidirectional data flow from the PLC to the ETH 1000 with a heartbeat in the return direction The ETH 1000 does not need to be present in the PLC s I O configuration although this is certainly allowed if required by the application as the ETH 1000 is capable of simultaneously acting as both an EtherNet IP client and
4. d as an array of 40 elements of data type INT Note that in practice this tag could be a standard tag or an alias tag We will then access the tag via a Data Table Read Write explicit messaging command from the ETH 1000 Example 1 In RSLogix 5000 create a new tag by right clicking on the Controller Tags menu in the project tree and selecting New Tag refer to Figure 1 2 Define an array named PLClInfo which is comprised of 40 elements of data type INT refer to Figure 2 Click Ok 08 07 2013 Rev 4 Page 1 of 6 EEC 1600 Aspen Commons Suite 210 Middleton WI USA 53562 Tel 608 831 1255 INDUSTRIAL CONTROL COMMUNICATIONS INC Fax 608 831 2045 Email sales iccdesigns com Name PLCInfo gt Controller EIP_example Description Monitor Tags Sal MainT Edit Tags J a eM Verify Unsch Sn Motion Gr Export Tags Tipe Base aa Un or 5 B Trends Print H S Alias For Data Types i Us pal Defined Data Type INTIAO Scope fi EIP_Esample io Read rite wt Style Decimal O w Figure 1 New Tag Menu Constant Open Configuration 3 The PLCInfo tag should now be visible in the Fiqure 2 Create PLCInfo Arrav Ta Controller Tags window refer to Figure 3 g i y tag Controller Spaniae AAB kk EIP AE Sue ten Alias For Base Tag Data Type Description zapadosd A E mu _ INTO
5. er Tags window refer to Figure 6 Controller Jaiz EIP Apam plalconteoier Show Show All Scape S EIF eie Alias For Base Tag b SLCInfo T INTIA Data Type Style Decimal Description j L Figure 6 Viewing the SLCInfo Tag 4 Navigate to Logic Map PLC SLC Messages refer to Figure 7 The PLC2 3 5 SLC Mapping window will appear 5 In the first row under the File Number column enter a value of 10 On the same row click on the dropdown box in the Tag Name column and select the SLCInfo tag refer to Figure 8 Click OK 6 The mapping is complete The SLCinfo tag can now be accessed by configuring a Typed Read Write service object on the ETH 1000 targeting File Number 10 The Slot field must be set to 0 to correspond with the location of the controller in the Logix rack The Element Data Type is set to 16 bit signed to correspond with the PLCInfo data type of INT The Element Type must match the size of the tag s data type If the tag s data type is DINT then the Element Data Type must be set to 32 bit signed unsigned Refer to the ETH 1000 User s Manual for detailed Se 4 troller EIP_exe fl a Monitor Tags F Edit Tags Produced Tags Verify LO Forcing eo SFC Forcing Controller Faul Power Lp Han information regarding configuration of EtherNet I
6. fied of changes to the produced tag s values when the IOT instruction executes e Uncheck this box to automatically notify the ETH 1000 of changes to the produced tag s values at the RPI rate no IOT instruction is necessary Click OK to close the Produced Tag Connection properties window and then click OK again to close the New Tag window 08 07 2013 Rev 4 Page 5 of 6 ay 1600 Aspen Commons Suite 210 Middleton WI USA 53562 NN Te 608 831 1255 INDUSTRIAL CONTROL COMMUNICATIONS INC Fax 608 831 2045 Email sales iccdesigns com Connection Name ProducedT ag Description Mas Consumers Include Connection staty M Send Data State Change Event To Consumers Type Produced Connection Alias For f E Data Type DINT H Scope i EIP_example Cancel Help e Decimal o o i we Figure 10 Produced Tag Connection Properties Open Configuration Figure 9 Create the Produced Tag 3 The tag is now ready to be accessed by the ETH 1000 You can now define the ETH 1000 EtherNet IP client connection object s and Produced Tag service object s to target the ProducedTag tag The Slot field must be set to 0 to correspond with the location of the controller in the Logix rack The Consumed Bytes must be set to the amount of data bytes contained in the produced tag which in this example is 4 bytes as determined by the DINT data ty
7. ix PLC can be achieved by several methods This document will explain three methods for accessing data on a Logix PLC with provided examples The first and simplest method directly accesses the Controller Tags with explicit messaging data transfers The second method maps Controller Tags to File Numbers and uses explicit messaging data transfers The third method requires the use of a Produced Tag connection on the PLC and uses implicit messaging data transfers In places this document shows some steps to take using Rockwell Automation software products such as RSLogix 5000 This is not intended to be a complete tutorial on using these products It is assumed that the reader has familiarity with the basic use of the controllers and software to program them The information presented here applies to all members of the ControlLogix family CompactLogix DriveLogix SoftLogix and FlexLogix etc This document applies to ETH 1000 coprocessor firmware V2 320 and later Older firmware must upgrade to at least firmware version V2 320 Method 1 Direct Tag Access The ETH 1000 Data Table Read Write service object is an explicit message that can be configured to directly target Controller Tags with a data type of SINT INT and DINT This method provides full read write capability from the ETH 1000 to the PLC memory In the following example in the controller at slot 0 we will create a tag called PLCInfo which is structure
8. pe References e Establishing O Communications with RA ControlLogix Systems on EtherNet IP Rev 1 0 Rockwell Automation March 10 2003 e Communicating with RA Products Using EtherNet IP Explicit Messaging Rev 1 2 Rockwell Automation June 7 2001 e ETH 1000 User s Manual Industrial Control Communications 08 07 2013 Rev 4 Page 6 of 6
9. server Produced tags must have a data type that is cumulatively 4 bytes or larger Therefore single 8 bit SINT and 16 bit INT tags cannot be configured as produced tags Use DINT REAL or user defined data types Any user defined data types must be at least 4 bytes or larger An array of DINT REAL or user defined data types are also permitted Produced tags must be less than 500 bytes in total size In the following example in the controller at slot 0 we will create a Produced Tag in the ControlLogix PLC called ProducedTag which is structured as a single DINT 32 bit or 4 byte data type Example 1 In RSLogix 5000 create a new tag by right clicking on the Controller Tags menu in the project tree and selecting New Tag refer to Figure 4 2 The New Tag window will appear refer to Figure 9 In the Name field type ProducedTag In the Type dropdown box select Produced For Data Type select DINT Click on the Connection button next to the Type dropdown box the Produced Tag Connection properties window as shown in Figure 10 will appear Depending on the PLC program decide whether or not to check the Send Data State Change Event To Consumer s checkbox according to the following criteria e Check this box if the PLC program will use an IOT instruction to send updated tag values to the ETH 1000 Note that if this box is checked then the ETH 1000 will only be noti
10. tag called SLCInfo which is structured as an array of 40 elements of data type INT Note that in practice this tag could be a standard tag or an alias tag We will then expose the SLCInfo tag to the EtherNet IP network by mapping it to File Number 10 which will provide PLC SLC style direct access to the underlying tag via a Typed Read Write explicit messaging command from the ETH 1000 Example 1 In RSLogix 5000 create a new tag by right clicking on the Controller Tags menu in the project tree and selecting New Tag refer to Figure 4 2 Define an array named SLCInfo which is comprised of 40 elements of data type INT refer to Figure 5 Click Ok 3 Controller EIF_example Contr plabas Name SI Clrte SS contr 24 Mew Tag Ctrl oe Sal Powel Descriptions Cancel 23 Tasks Monitor Tags Sa Maint Edit Tags i Help aj M Verify Unsch 3 Motion Gr Export Tags Ungra Type Base Print b ia E Alias Eor 3 Data Types Ca User Defined eee ean Data Type INT 40 Figure 4 New Tag Menu Scope f EIP_example style Decimal h Figure 5 Create SLCInfo Array Tag 08 07 2013 Rev 4 Page 3 of 6 c INDUSTRIAL CONTROL COMMUNICATIONS INC 1600 Aspen Commons Suite 210 Middleton WI USA 53562 Tel 608 831 1255 Fax 608 831 2045 Email sales iccdesigns com 3 The SLCInfo tag should now be visible in the Controll
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