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MELSEC-Q
3 SPECIFICATIONS
(2) System switching when a system switching dedicated instruction is
executed, a system switching request is issued by GX Developer,
or the link cable is disconnected on other network module
Multiplexed remote master station (DM
R
)
Control system standby system
Multiplexed remote sub-master station (DSM
R)
Standby system control system
Remote I/O station (R)
Remote I/O station (R) Remote I/O station (R)
GX Developer
System switching request
(a) CPU system switching time < System switching time from the multiplexed
remote master station to the multiplexed remote sub-master station
Standby system control system CPU
Output holding time of remote I/O station
System switching request from GX Develope
r
SS
Ds2
Toh
Control system standby system CPU
[Output holding time (Toh)]
Toh = Ds2 + SS [ms]
Ds2: Switching time from the multiplexed remote master station to the
multiplexed remote sub-master station [ms]
SS: Scanning time of the redundant CPU [ms]