EIP Protocol
PLX3x Series ♦ Multi-Protocol Gateways
User Manual
Page 84 of 215
ProSoft Technology, Inc.
January 25, 2018
MG
Code
Description
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Control
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Error
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RLEN
3
DLEN
5.4.3 ControlLogix and CompactLogix Processor Specifics
Messaging from a ControlLogix or CompactLogix Processor
Use the MSG instruction to exchange data between a Control/CompactLogix
processor and the gateway. There are two basic methods of data transfer
supported by the gateway when using the MSG instruction: encapsulated PCCC
messages and CIP Data Table messages. You can use either method.
Encapsulated PCCC Messages
This section contains information specific to the Control/CompactLogix processor
when using the PCCC command set. The current implementation of the PCCC
command set does not use functions that can directly access the Controller Tag
Database. In order to access this database, you must use the table-mapping
feature in RSLogix 5000. RSLogix 5000 permits assigning Controller Tag Arrays
to virtual PLC 5 data tables. The PLX3x gateway using the PLC 5 command set
defined in this document can then access this controller data.
PLC5 and SLC5/05 processors containing an Ethernet interface use the
encapsulated PCCC message method. The gateway simulates these devices
and accepts both read and write commands.
Encapsulated PCCC Write Message
Write commands transfer data from the processor to the gateway. The gateway
supports the following encapsulated PCCC commands:
PLC2 Unprotected Write
PLC5 Typed Write
PLC5 Word Range Write
PLC Typed Write
