Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 144

4 SETUP AND PROCEDURES BEFORE STARTING THE OPERATION
CPU
module
CPU
module
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2) When designating a station in other than the redundant system as a
testing station
The settings are the same as those for the usual forward loop/reverse
loop test (refer to (1) (a) of this section).
Set "Online" to the redundant system modes of both systems A and B.
(2) Starting the test
Perform the following on the station to be tested first, and then the station
executing the test.
(a) High Performance model QCPU, Process CPU, and Redundant CPU
Set the RUN/STOP switch to STOP position, and reset with the
RESET/L.CLR switch.
Center
3
4
5
STOP RUN
RESET L.CLR
(b) Basic model QCPU, Universal model QCPU, and Safety CPU
Reset with the RESET/STOP/RUN switch.
Hold the switch in the RESET position until the ERR. LED starts flashing,
and release it after the LED turns off.
STOP
RESET RUN
STOP
POINT
To execute the forward loop/reverse loop test, connect the cable correctly to IN and
OUT. Do not connect or disconnect the cable during execution of the test. (Doing
so will result in test failure.)
<Settings for system A>
Set "Online" for the mode of both systems A and B.
RESET
3
4
5
STOP RUN
RESET L.CLR
Move to RESET.
RESET RUN
STOP
MELSEC-Q
<Settings for system B>
Center
3
4
5
STOP RUN
RESET L.CLR
The ERR. LED flickers.
When it goes off, release
the switch.
RESET RUN
STOP
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