Using The Led Indications To Check Errors - Mitsubishi AJ65SBT-62DA User Manual

6 TROUBLESHOOTING

6.2 Using the LED Indications to Check Errors

This section explains how to check errors using the LED indications of the AJ65SBT-
62DA.
Refer to the PLC CPU and master module user's manual for issues regarding the PLC
CPU and master module.
(1) When the AJ65SBT-62DA "PW" LED is off
Check Item
Is 24VDC power on?
Is the voltage of the 24VDC power supply within the
specified value?
(2) When the AJ65SBT-62DA "RUN" LED flickers
Check item
Is the LED flickering at 0.1s intervals in the normal
mode?
Is the LED flickering at 0.5s intervals in the normal
mode?
Is the LED flickering at 0.1s intervals in the test
mode?
Is the LED flickering at 0.5s intervals in the test
mode?
(3) When the AJ65SBT-62DA "RUN" LED is off
Check item
Has the watchdog timer error occurred?
Has the TEST terminals (across 8-9) been shorted
to enter the test mode?
(4) When the AJ65SBT-62DA "L RUN" LED is off
Communications are broken.
For details, refer to troubleshooting in the user's manual of the master module
used.
Check the external power supply.
Set the voltage value to within the range 20.4 to
26.4V.
1. Using the error code (RWrn+2), check the
channel at which the output range setting error
has occurred.
2. Make correction to the sequence program or GX
Developer setting.
1. Using the error code (RWrn+2), check the
channel at which the digital value setting error
has occurred.
2. Check the check code (RWrn, RWrn+1) of the
channel at which the error has occurred.
3. Make correction to the sequence program.
Set all channels to any of "user range settings 1 to
3" in output range setting.
Change the offset/gain adjustment to within the
available setting range.
Using the link special registers (SW0084 to
SW0087) of the master module, check the
watchdog timer error and power on the AJ65SBT-
62DA again.
If the "RUN" LED is not lit after power is switched
on again, the possible cause is a hardware fault.
Contact your nearest Mitsubishi representative.
After making offset/gain adjustment, open the TEST
terminals (across 8-9).
6 - 2
MELSEC-A
Corrective Action
Corrective action
Corrective action