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MELSEC-Q
4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
(b) Mode setting for the forward loop/reverse loop test on the redundant
system
To perform the forward loop/reverse loop test on the redundant system, set
the operation mode of the redundant CPU to backup mode.
If the power to both systems cannot be turned on or off, perform the
forward loop/reverse loop test in separate mode.
1) When designating the redundant system as the testing station
The table below shows the mode settings for the case where the
redundant system is specified as a testing station.
Set station Description of setting
Station performing
the test
Redundant system
In backup mode
Set "Forward loop test" or
"Reverse loop test."
In separate mode
Station not
performing the test
Redundant system
In backup mode Set "Offline."
In separate mode Set "Online."
Non-redundant system station Set "Online."
The following shows the setting where system A (station No. 1) of the
redundant system (in backup mode) is specified as a station
performing the forward loop test.
Redundant
CPU
Redundant
CPU
Power supply
module
Q25H
CPU
Station
No. 4
Q25H
CPU
Control system
(system A)
Standby system
(system B)
Set "Offline" for the mode of system B
(station No. 2).
Set "Forward loop test" for the mode of
system A (station No. 1).
Set "online" for the mode of non-redundant
stations not performing the test
(station Nos. 3 and 4).
Power supply
module
Station
No. 3
Power supply
module
Power supply
module
Station
No. 2
Station
No. 1
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