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6-12
Peer-to-Peer Messaging
Communicate with PLC-5 or
SLC 500 Processors
Publication CNET-UM001C-EN-P - November 2005
If the message is to a PLC-5 or SLC 500 processor and it reads or writes
integers (not REALs), use a buffer of INTs in the message.
• Logix5000 controllers execute more efficiently and use less memory
when working with 32-bit integers (DINTs).
• PLC-5 and SLC 500 processors require 16-bit integers.
• Use an INT buffer in the message and move the data to or from DINTs
as needed. Use the DINTs in the rest of the program; this can decrease
the program scan.
Logix5000 controllers can only send messages to SLC 500
IMPORTANT
processors over ControlNet if the SLC processor uses a
KFC ControlNet communication card.
However, an SLC cannot send messages to Logix5000
controllers over ControlNet at all.
Initiate MSGs from PLC-5 Processors to Logix5000 Controllers
If the originating controller is a PLC-5 processor, in the MSG instruction,
select PLC5.
The figure Configure the Message shows how to configure the message above.
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