Mitsubishi Electric MELSEC iQ-R-R00CPU - System A;B Settings

36 PROCEDURE FOR STARTING UP A SYSTEM USING THE SIL2 PROCESS CPU
36.5 System A/B Settings
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36.5 System A/B Settings
Set the system A or B with the engineering tool and write the system settings to the CPU module.
[Online]  [Redundant PLC Operation]  [System A/B Setting]
Setting procedure
Besides the method that uses the engineering tool for setting system A and B, system A and B can be
automatically set by using the systems.
When one system is set to system A and gets ready for tracking communications, the other system is
automatically set to system B, and vice versa.
For the system to which system A or system B has been assigned automatically, the system setting will be
overwritten automatically. In that case, the system setting change can be checked in the event history. (Event
code: 00700)
• If a system that has no system A/B setting yet is connected to the system specified as system A, the system
that has no system A/B setting will be automatically set to system B. (This event is not recorded in the event
history.)
• If a system specified as system A is connected to another system specified as system A, the system where
the CPU module is turned off and on or reset will be automatically set to system B. (This event is recorded
in the event history.)
1. Set the CPU module to the STOP state.
2. Select the setting to be written to the own system on the
"System A/B Setting" window.
3. Click the [Execute] button.
4. Click the [Yes] button on the window on the left. Check
that the SYS A LED or SYS B LED of the redundant
function module flashes in accordance with the setting.
5. To change the system A/B settings, power off and on the
system or reset the CPU module, and then click the
[OK] button. Check that the SYS A LED or SYS B LED
of the redundant function module turns on in
accordance with the new setting.