26 BASIC CONCEPT
26.7 Determination of Control System/Standby System
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Operation example
1. Both systems are temporarily powered
off due to a power failure or other
causes while the system B is operating
as the control system.
2. The system A is started as the control
system when both systems are
powered on. SM1636 turns on for only
one scan after the CPU module in the
system A is set to the RUN state.
3. The system switching is performed by
the SP.CONTSW instruction.
4. The system B is switched from a
standby system to a control system.
System A
Standby system → Power-off
System B
Control system → Power-off
GOEND
SP.CONTSW D0 M0
SM1636
GOEND
SP.CONTSW D0 M0
SM1636
System A
Power-on → Control system
System B
Power-on → Standby system
System A
Control system
System B
Standby system
System switching
System A
Control system → Standby system
System B
Standby system → Control system
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