Mitsubishi Electric MELSEC iQ-R Series User Manual page 189

(0) When the system is switched from standby system to control system by redundant system switching, turn off 'Forced master switching' (SB000C),
'EnableControlProgramExecution' (M100), and 'Compl_ScanWaitAfterBackUpLinkDevice' (M103). Also, clear 'NumberOfScansAfterBackUpLinkDevice'
(D0).
(7) After saving the RX, RY, RWr, RWw data to devices and wait a fixed number of scans, turn on 'Compl_ScanWaitAfterBackUpLinkDevice' (M103).
After saving the link devices, wait a fixed number of scans and execute the processing that sets the link devices saved at master switching and 'Refresh
instruction at standby master switching' (SB0001). (In the program example, wait for the number of scans for the value entered in the position "K0".)
For details, refer to precautions of the standby master function. ( Page 47 Precautions)
(16)When 'Master switching request acceptance' (SB005A) is turned on, the data in RX, RY, RWr and RWw will be saved in 'BackUpRX' (W1300), 'BackUpRY'
(W1200), 'BackUpRWr' (W1500), and 'BackUpRWw' (W1400).
(42)When 'Master switching request completion' (SB005B) and 'Compl_ScanWaitAfterBackUpLinkDevice' (M103) are turned on, the data saved in the
'BackUpRX' (W1300), 'BackUpRY' (W1200), 'BackUpRWr' (W1500), and 'BackUpRWw' (W1400) will be stored in RY, RX, RWw and RWr.
(69)Turn on 'Refresh instruction at standby master switching' (SB0001).
(77)Turn off 'Refresh instruction at standby master switching' (SB0001).
(88)Execute refresh for link devices (RX, RY, RWr, and RWw).
Appendix 8 How to Use Standby Master Function in Redundant System
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