6 TROUBLESHOOTING
6.2 Using the LED Indications to Check Errors
MELSEC-A
This section explains how to check errors using the LED indications of the AJ65SBT- 64AD.
Refer to the PLC CPU and master module user's manual for issues regarding the PLC CPU and master module.
(1) When the
Check item | Corrective action |
Is 24VDC power on? | Check the external power supply. |
Is the voltage of the 24VDC power supply within the | Set the voltage value to within the range 20.4 to |
specified value? | 26.4V. |
(2) When the AJ65SBT-64AD "RUN" LED is flashing
Check item | Corrective action | ||
| 1. Using the remote input signals (RXn4 to RXn7), | ||
Is the LED flickering at 0.1s intervals in the normal | check the channel at which the input range | ||
setting error has occurred. | |||
mode? | |||
2. Make correction to the sequence program or | |||
| |||
| GPPW setting. | ||
Is the LED flickering at 0.1s intervals in the test | Set all channels to any of "user range settings 1 to | ||
mode? | 3" in input range setting. | ||
Is the LED flickering at 0.5s intervals in the test | Change the offset/gain adjustment to within the |
| |
mode? | available setting range. |
|
(3) When the AJ65SBT-64AD "RUN" LED is off
Check item | Corrective action |
| Using the link special registers (SW0084 to |
| SW0087) of the master module, check the |
| watchdog timer error and power on the AJ65SBT- |
Has the watchdog timer error occurred? | 64AD 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. |
Has the TEST terminals (across | After making offset/gain adjustment, open the TEST |
to enter the test mode? | terminals (across |
(4)When the
For details, refer to troubleshooting in the user's manual of the master module used.
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