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6.2 Redundant System Network Overview
6.2.3 Ethernet
6
REDUNDANT SYSTEM NETWORKS
The control system Ethernet module can issue a system switching request to the control
system CPU module when it detects a communication error or disconnection*
2
.
System switching is carried out when the control system CPU module receives the system
switching request from that Ethernet module.
The system switching request can be set to be issued or not in the network parameters, as
indicated in (3).
* 1: Only the QJ71E71-100 can detect disconnection.
Remark
A system switching request is not issued when Ethernet interface module is
mounted to the extension base unit.
Diagram 6.21 Operation when a communication error or disconnection is detected
System A - Control System
System B - Standby System
OPS
System B - Standby SystemSystem A - Control System
OPS
System switching request
Communications
error occurred
Communication not possible
(malfunction, severed cable)
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