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27 PROCEDURE FOR STARTING UP A REDUNDANT SYSTEM
27.5 System A/B Settings
Checking method
Check the LED of each redundant function module to check the system status.
Users can check the system A/B setting with the engineering tool. ( GX Works3 Operating Manual)
• System monitor
• "System A/B Setting" window
• Monitor status bar
Precautions
• Do not power off or reset the CPU module during system A/B setting. Doing so may not properly reflect the system A/B
setting. If the system A/B setting has not been properly reflected, set the system again.
• For the system A/B setting, use the CPU module that has been connected with a USB cable or an Ethernet cable. Users
cannot set a system if they have changed the connection destination on the engineering tool.
• The set system A/B information cannot be deleted. Only changing the set system A/B information is supported.
• When starting up both systems, if both systems have no system A/B setting yet or the same system A/B setting, a stop
error will occur when tracking communications are established. Set a different system A/B setting for each system.
• If the system that has no system A/B setting yet is started first, a stop error will occur when tracking communications are
established. Set a different system A/B setting for each system.
• Be careful not to connect between running system As or between system Bs with tracking cables. Otherwise, a continuation
error will occur.
Setting on the engineering tool LED of the redundant function module
System A
System B
When the system setting is switched from system A to B
When the system setting is switched to the system B with the engineering tool,
The SYS B LED will flash.
Powering on or resetting the CPU module turns off the SYS A LED and turns
on the SYS B LED.
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