Checking The Leds - Mitsubishi Electric NZ2GN2B1-32D User Manual

11.2

Checking the LEDs

This section describes how to troubleshoot the system by the LEDs.
Determining the module error status
An error status can be determined by the On/Off status of RUN LED and ERR. LED as follows.
RUN LED ERR. LED
Off On
On On
On Flashing
*1 When multiple errors occur, the error status is displayed in the order of major error > moderate error > minor error.
*2 When the module is faulty, the LED may not turn on.
When the PW LED does not turn on
When the PW LED does not turn on, check the following items.
Check item
Is any LED other than the PW LED turned on?
Is the module power supply (24VDC) wired?
Is the module power supply (24VDC) turned on?
Is the voltage of the module power supply (24VDC) within the
specified range?
When the RUN LED does not turn on
When the RUN LED does not turn on, check the following items.
Check item
Has any hardware error occurred?
When the RUN LED flashes
When the RUN LED flashes, check the following items.
Check item
Is the I/O module in execution of the unit test?
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11.2 Checking the LEDs
Error type
*2
Major error
Moderate error
Minor error
*1
Description
When this error occurs, the module stops operating, and the customer must consult
with their local Mitsubishi representative for troubleshooting.
When this error occurs, the module stops operating, but the error can be handled
through operation by the customer.
When this error occurs, the module continues to operate.
Action
When any LED other than the PW LED turns on, the possible cause is a hardware
error. Please consult your local Mitsubishi representative.
Wire the module power supply (24VDC).
Turn on the module power supply (24VDC).
Set the voltage value within the range of performance specifications.
Action
Check that the module power supply voltage is within the range of performance
specifications. ( Page 17 Performance Specifications)
After the check, power off and on the module.
If the RUN LED does not turn on even after the module power supply is turned off and
on, the possible cause is a module failure. Please consult your local Mitsubishi
representative.
Action
When a unit test is conducted on the I/O module, the RUN LED turns on after the unit
test is completed. Take corrective action according to the result of the unit test.
When a unit test is not conducted, set the IP address setting switch to an appropriate
value and set function setting switch 1 to OFF.
Page 94 Unit Test