Check Of Module Condition (Self-Loopback Test) - Mitsubishi MELSEC-Q Series User Manual

6 TROUBLESHOOTING

6.7 Check of Module Condition (Self-loopback Test)

*1: Only for the Q02/Q02H/Q06H/Q12H/Q25H/Q02PH/Q06PH/Q12PH/Q25PHCPU and C Controller module.
RUN
When normal ON
ON
When faulty
OFF
ON
*2: Dimly lit or blinks.
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This test allows you to check if the module itself operates normally or not.
Follow the steps shown below.
Connect cable and supply 24V DC through
dedicated power supply or power supply
adapter
Before power ON, check the following:
Installed condition of module
Voltage input from power supply
"Stop" position of RUN/STOP switch of
CPU module
"Central position" of RESET switch of CPU
module
*1
Turn "ON" SW8 of operation setting switch
of QJ61CL12 and set it to test mode.
Reset the CPU module by the following
procedure.
1) Set switch to RESET position.
2) Set switch to middle position.
LED Indication
ERR. SD RD
OFF *2 *2
OFF OFF OFF
OFF OFF OFF
ON OFF OFF
Start
Power ON
RESET
RESET
END
[Test Results]
L RUN L ERR.
ON OFF
OFF ON
Replace module because of faulty hardware
OFF OFF
OFF OFF Set operation setting switch again.
MELSEC-Q
Corrective Action
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