Troubleshooting With Led Indicators; Led Status Of The Cpu Module - Mitsubishi Electric MELSEC iQ-R Series User Manual

33.1

Troubleshooting with LED Indicators

Check the LED status of each module as primary diagnostics.

LED status of the CPU module

The following table lists the check points on the LED status of the CPU module.
The error status can be checked visually using the READY LED and ERROR LED.
LED indicator Error
status
READY ERROR
On Off No error
On Minor error
Flashing Moderate
error
Off On/ Major error
flashing
Off Hardware
failure
No error
Flashing On Minor error
Off No error
Flashing Off No error
The LED status can also be checked on the module diagnostics window using the engineering tool. ( GX
Works3 Operating Manual)
Program Description
execution
status
Continued Normal operation
A minor error or warning has been detected.
Program execution and data communications
with network stations are continued.
Stopped A programming error, parameter setting error,
or temporal noise has been detected.
Program execution and data communications
with network stations are stopped.
A hardware failure has been detected. No
operation cannot be performed.
A hardware failure has been detected. No
operation cannot be performed.
Power is not supplied or power went out.
A minor error has been detected during
online module change.
• The READY LED is flashing every 400ms:
Online module change is in progress.
• The READY LED is flashing every 2s:
Initial processing is being performed.
The READY LED is flashing every 2s: Initial
processing is being performed.
Action

Identify the error cause using the engineering tool, and
take an action.
Identify the error cause using the engineering tool, and
take an action.
Perform troubleshooting for the error module. If the
problem still exists after troubleshooting, replace the
error module. ( Page 536 When the READY LED
of the CPU Module Turns Off)
Check that the power is supplied to the system. If the
power is supplied properly, the possible cause is a
hardware failure. Perform troubleshooting for the error
module. If the problem still exists after troubleshooting,
replace the error module. ( Page 536 When the
READY LED of the CPU Module Turns Off)

Identify the error cause using the engineering tool, and
take an action.


33 TROUBLESHOOTING PROCEDURE
33.1 Troubleshooting with LED Indicators
33
533