Rockwell Automation 1785-BCM_BEM, D17856.5.4 PLC-5 Backup Communication Module User Manual - Manual (Page 13)

Backup Concepts for the PLC-5 System
Chapter 1
1-5
Figure 1.2
PLC-5 Backup System Configuration Using 1785-BCM
and 1785-BEM Modules
Remote I/O Chassis No. 1 Remote I/O Chassis No. n
1771 –P4S
Power Supply 1771 –P4S
Power Supply
1785 –BCM Module
Local I/O Chassis Local I/O Chassis
PLC –5/60
or –5/40
PLC –5/60
or –5/40
1785 –BEM Module 1785 –BCM Module 1785 –BEM Module
DH+ or RIO (BEM Module)
19088
HSSL
BCM DH+ or RIO
BEM RIO
BEM DH+ or RIO
BCM DH+ or RIO
DH+ or RIO (BCM Module)
DH+ or RIO (BCM Module)
Do not put modules
for controlling your
process in local I/O
chassis.
HSSL connects between the two 1785-BCM modules only.
Remote
I/O
(BEM
Module)