Rockwell Automation 1747-DCM,D17476.8 Direct Communication Module - Manual (Page 46)

Chapter 6
Programming
6–4
Physical Input into First SLC – Physical Output from Second SLC
For this example the second SLC has a logical PLC rack address of 3 and an
SLC slot address of 4.
I:020
10
( )
O:031
00
O:3.1
00
]/[
I:4.0
08
( )
O:1.0
00
SLC
PLC
First
SLC
Processor
DCM Second
SLC
Processor
RIO
Input
Output
] [
I:021
00
OUT
DCM
] [
00
IN ] [
I:4.1
00
(No physical input into the PLC)
]/[
I:2.0
PLC with
RIO
scanner
Logical Or Status Bit
Logical Or Status Bit
( )
When transmitting data from a PLC to an SLC, if the Clear On Fault (CLR
ON FLT) is active (switch is OFF), the instruction to examine the Logical
OR bit of the status word can be omitted as long as clearing the DCM input
image table puts SLC outputs into a safe state for the specific application.