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MELSEC-A
6 TROUBLESHOOTING
6.2 Using the LED Indications to Check Errors
This section explains how to check errors using the LED indications of the
AJ65VBTCU-68DAVN.
Refer to the PLC CPU and master module user's manual for issues regarding the PLC
CPU and master module.
(1) When the AJ65VBTCU-68DAVN "POWER" LED is off
Check Item
Corrective Action
Is 24VDC power on?
Check the external power supply.
Is the voltage of the 24VDC power supply within the
specified value?
Set the voltage value to within the range 20.4 to
26.4V.
(2) When the AJ65VBTCU-68DAVN "RUN" LED flickers
Check item
Corrective action
When used as the ver.
1 remote device station
(ver. 1 compatible slave
station)
1. Check that the mode select switch is not set to
other than 0. (When the module is used as the
ver. 1 remote device station, set the mode select
switch to "0".)
2. Check the error code (RWrn+8) to confirm the
channel where the output range setting error
occurred.
3. Correct the sequence program or GX Developer
setting.
Is the LED flickering at
0.1s intervals in the
normal mode?
When used as the ver.
2 remote device station
(ver. 2 compatible slave
station)
1. Check that the mode select switch is not set to
other than 3. (When the module is used as the
ver. 2 remote device station, set the mode select
switch to "3".)
2. Check the error code (RWrn+8) to confirm the
channel where the output range setting error
occurred.
3. Correct the sequence program or GX Developer
setting.
Is the LED flickering at 0.5s intervals in the normal
mode?
1. Check that the mode select switch has not been
moved from the position at power-on. (When the
switch is returned to the original setting, the
flickering LED is lit.)
2. Using the error code (RWrn+8), check the
channel at which the digital value setting error
has occurred.
3. Check the check code (RWrn to RWrn+7) of the
channel at which the error has occurred.
4. Make correction to the sequence program.
Is the LED flickering at 0.1s intervals in the test
mode?
Check that the mode select switch is not outside the
setting range.
Is the LED flickering at 0.5s intervals in the test
mode?
Change the offset/gain adjustment to within the
available setting range.
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