Mitsubishi Electric MELSEC Q Series Reference Manual page 163

*1 When the redundant system is in separate mode, power OFF and ON only system B or reset the CPU module of system
B.
*2 When the redundant system is in separate mode,
1) Set the mode of system B to online mode, and write the data to the system B CPU module.
2) Power OFF and ON only system B or reset the CPU module of system B.
3) Connect the programming tool to the control system CPU module, and change the mode of the redundant system
to backup mode.
● When executing the self-loopback test, be sure to connect a cable.
Also, do not insert or remove the cable during test execution. (Doing so will result in error completion.)
● The self-loopback test result can be confirmed with the link special relay (SB0092, SB0093). (
1)
CHAPTER 5 PREPARATION AND SETUP
Page 568, Appendix
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