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11 TROUBLESHOOTING
11.2 Checking the LEDs
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.
*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.
When the RUN LED does not turn on
When the RUN LED does not turn on, check the following items.
When the RUN LED flashes
When the RUN LED flashes, check the following items.
RUN LED ERR. LED Error type
*1
Description
Off On
*2
Major error When this error occurs, the module stops operating, and the customer must consult
with their local Mitsubishi representative for troubleshooting.
On On Moderate error When this error occurs, the module stops operating, but the error can be handled
through operation by the customer.
On Flashing Minor error When this error occurs, the module continues to operate.
Check item Action
Is any LED other than the PW LED turned on? When any LED other than the PW LED turns on, the possible cause is a hardware
error. Please consult your local Mitsubishi representative.
Is the module power supply (24VDC) wired? Wire the module power supply (24VDC).
Is the module power supply (24VDC) turned on? Turn on the module power supply (24VDC).
Is the voltage of the module power supply (24VDC) within the
specified range?
Set the voltage value within the range of performance specifications.
Check item Action
Has any hardware error occurred? Check that the module power supply voltage is within the range of performance
specifications. ( Page 22 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.
Check item Action
Is the IP address/station number setting switch (x16) of the I/O
module set to F, and is function setting switch 1 set to ON?
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. (
Page 198 Unit Test)
When a unit test is not conducted, set the IP address/station number setting switches
to an appropriate value, and set function setting switch 1 to OFF.
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