Hardware reference guide

Modbus Plus NOM
306
35013379 02 October 2007
Hot Standby
Systems
The following figure shows the self healing ring configuration for hot standby
systems example.
490NR25400 Fiber Optic Repeater
for Modbus Plus
Primary System
P/S CPU CRP
CHS
252
MB+ Cable
Legend
Fiber Optic Cable
MB+ Tap with
Terminator
Node # 1
P/S CPU I/ONOM
I/O
252
PC with SA85 Card
P/S CPU I/O I/OI/O
Remote I/O Drop
P/S
NOM
931
110
Standby System
P/S CPU CRP
CHS
252
P/S
NOM
931
110
Node # 2
MB+ Tap
Remote I/O
RIO Cable
Coaxial RIO Link
To Other
RIO Drops
490NR95400 Fiber Optic Repeaters (for RIO)
Typical Hot Standby System with Remote I/O
Self Healing Ring Configuration for Hot Standby Systems Example
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com