Mitsubishi Q12PRHCPU - Page 241

6
REDUNDANT SYSTEM NETWORKS
6.2 Redundant System Network Overview
6.2.2 MELSECNET/H Remote I/O network
6 - 18
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
(2) Redundant System Operation at System Switching
When system switching occurs, the new control system network module operates as
the master station, and takes over the control of remote I/O stations.
Diagram 6.14 shows a redundant system operation when a stop error occurs in the
control system CPU module.
Diagram 6.14 Redundant System Operation at System Switching
Control system
Standby system
Tracking cable
Tracking cable
MELSECNET/H Remote I/O network
Remote I/O station
(station No. 3)
Remote I/O station
(station No. 2)
Control
system
Standby
system
MELSECNET/H Remote I/O network
Stop
Remote I/O station
(station No. 3)
Remote I/O station
(station No. 2)
Output is preserved
during system switching
Output is preserved
during system switching
2) Perform system switching
Stop Error has
occurred
1)
Master
station
Multiplexed Remote Master
Station (station No. 0)
Multiplexed Remote Sub-master
Station (station No. 1)
Multiplexed Remote Master
Station (station No. 0)
Multiplexed Remote Sub-master
Station (station No. 1)
Standby
System
Control
System