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MELSEC-QnA
15 FUNCTIONS (FUNCTION VERSION B OR LATER)
15.5 Standby Master Function
This function allows data link to continue when an error occurs at the master station, by
switching to the standby master station.
However, switching from the standby master station to the master station will not occur
automatically when the master station returns.
15.5.1 Operation overview
The operation overview of the standby master function is shown in Figure 15.3.
R1
R2
L3
CPU
R1
R2
L3
CPU
CPU device Master station
Local station
(Standby master
station)
Remote output
Remote input
Master station down
CPU device Master station
Local station
(Standby master
station)
Remote output
Remote input
1
2
1: Accepts refresh from the CPU by the switching instruction of the link special relay
(SB0001).
2: The host area is retained/cleared (by the DIP switch).
Figure 15.3 Operation overview of the standby master function