Checking The Leds - Mitsubishi Electric MELSEC L Series User Manual

11.4
This section describes troubleshooting using the LEDs.
(1) When the RUN LED turns off
Is the head module installed correctly?
If the above action does not solve the problem, perform a unit test on the head module to check for a hardware
failure. (
(2) When the RUN LED flashes
Is the switch on the head module set to "RUN"?
Is it in the remote STOP state?
Has an error occurred in the head module?
Is the master station in the RUN state?
Was the head module disconnected during STOP of the master
station?
(3) When the MODE LED turns off
Is the mode of the head module set to Online?
If the above action does not solve the problem, perform a unit test on the head module to check for a hardware
failure. (
(4) When the MODE LED flashes
Is the head module in preparation for the unit test?
Is the head module in execution of the unit test? (The 1 or 10
LED is flashing.)
Is the mode of the module on the master station set to Online?
If the above actions do not solve the problem, perform a unit test on the head module to check for a hardware
failure. (
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Checking the LEDs

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Page 45, Section 6.4)
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Page 45, Section 6.4)
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Page 45, Section 6.4)
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Connect the head module to the power supply module again.
Set the switch on the head module to RUN to start data link.
Cancel the remote STOP state and start data link.
Identify the error cause on the "System Monitor" window using GX
Works2, and take action. (
Set the operating status of the master station to RUN. If the master
station has stopped due to an error, troubleshoot it referring to the
manual for the master station. (
module used)
• Set the operating status of the master station to RUN and reconnect
the head module to the network.
• Reset the head module because it retains the STOP status of the
master station.
Change the mode to Online. (
If the switch on the head module was repeatedly switched between
STOP and RESET/TEST, reset the head module and start the unit test.
The head module is in execution of the unit test. Upon completion of the
unit, the D LINK LED turns on. Take action according to the unit test
result. ( Page 45, Section 6.4 (1))
Change the mode to Online. (
module used)
CHAPTER 11 TROUBLESHOOTING
Action
Action
Page 84, Section 11.2)
User's manual for the master/local
Action
Page 53, Section 7.1 (1))
Action
User's manual for the master/local
11
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