Mitsubishi Q12PRHCPU - Page 235

6
REDUNDANT SYSTEM NETWORKS
6.2 Redundant System Network Overview
6.2.1 CC-Link IE Controller Network or MELSECNET/H PLC to PLC network
6 - 12
1
OVERVIEW
2
SYSTEM CONFIGURATION
3
TRACKING CABLE
4
PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
5
REDUNDANT SYSTEM FUNCTIONS
6
REDUNDANT SYSTEM NETWORKS
7
PROGRAMMING CAUTIONS
8
TROUBLESHOOTING
[Example]
Diagram 6.9 shows the redundant system operation when the control system
network module detects a communication error, on the assumption that the
control system network module is the control station of station No.1, and the
standby system network module is the normal station of station No. 2.
Diagram 6.9 Continuation of Data Link via System Switching
CC-Link IE Controller Network
CC-Link IE Controller Network
Control systemStandby system
Normal station
(Station No. 3)
Normal station
(Station No. 4)
Normal station
(Station No. 3)
Operation when a communication error occurs
in the MELSECNET/H PLC to PLC network
Standby system
Control system
Control station
(Station No. 1)
Normal station
(Station No. 2)
Normal station
(Station No. 1)
Normal station (Station No. 2)
Sub-control station
Communication
error
The new control system's
normal station becomes the
sub-control station and
maintains the data link
System switching
request
Communication
not possible
Tracking cable
Tracking cable