PLX30 Series
EIP Protocol
Ethernet and Serial Gateways
User Manual
ProSoft Technology, Inc.
Page 85 of 200
September 19, 2012
5.4.3 ControlLogix and CompactLogix Processor Specifics
In order to exchange data between a Control/CompactLogix processor and the
gateway, the MSG instruction is used. 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. Either method
can be used, and the selection is left to the application developer.
Encapsulated PCCC Messages
This section contains information specific to the Control/CompactLogix processor
when used with the PCCC command set. The current implementation of the
PCCC command set does not use functions that can directly interface with the
Controller Tag Database. In order to interface with this database, the table-
mapping feature provided by RSLogix 5000 must be used. The software permits
the assignment of Controller Tag Arrays to virtual PLC 5 data tables. The ProSoft
gateway using the PLC 5 command set defined in this document can then reach
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. The following topics describe the
support for the read and write operations.
Encapsulated PCCC Write Message
Write commands transfer data from the processor to the gateway. The following
encapsulated PCCC commands are supported:
PLC2 Unprotected Write
PLC5 Typed Write
PLC5 Word Range Write
PLC Typed Write
An example rung used to execute a write command is shown in the following
diagram:
