Product data

Publication 1785-SG001B-EN-P - June 2006
Introduction 5
Apply Backup Solutions
The ControlNet Hot Backup Module, 1785-CHBM, provides backup of
ControlNet I/O. A secondary controller qualifies critical-control information
with the primary controller. Both controllers consume information from
inputs and connect to outputs, but only the primary controller controls the
outputs. The secondary controller establishes control of outputs if the primary
controller shuts down.
For more information, see page 23.
The PLC-5 Backup Communication Module, 1785-BCM, helps increase the
fault tolerance of PLC-5 programmable controller systems controlling I/O on
a remote I/O link by providing backup of the PLC-5 programmable
controller.

ControlNet PLC-5
Controller with 1785-CHBM
Cartridge Installed
PanelView Plus
or Other Interface
Device
ControlNet PLC-5
Controller with 1785-CHBM
Cartridge Installed
1794 FLEX I/O
1746 I/O
1771 I/O
Redundant
ContolNet Network
and/
or
and/
or
Cat. No. Connections Customer Relay Design Considerations Power
Dissipation
Backplane Current
Load
1785-BCM 1771-WG wiring arm
(included)
0.25 A @ 24V dc (resistive) Place in local I/O chassis 10 W max 1 A
Local I/O Chassis
Local I/O Chassis
1785-BCM Module
1785-BCM Module
PLC-5 Controller
PLC-5 Controller
High-speed Serial Link
Remote
I/O Link
DH+ Link
DH+ Link
Remote I/O Chassis
Remote I/O Chassis
Terminator
Remote I/O Link
1771-ASB
1771-ASB