Chapter 3 Troubleshooting; Troubleshooting With The Leds; Checking The State Of The Module - Mitsubishi Electric MELSEC iQ-R Series User Manual

3
TROUBLESHOOTING
This chapter describes errors that may occur in the use of a temperature input module and those troubleshooting.
3.1

Troubleshooting with the LEDs

Check the state of the LEDs to narrow down the possible causes of the trouble. This step is the first diagnostics before using
the engineering tool.
A state of a temperature input module can be checked with the RUN LED, ERR LED, and ALM LED. The following table
shows the relation of these LEDs and a state of a temperature input module.
Name
RUN LED
ERR LED
ALM LED
*1 For details, refer to the following.
Page 83 List of Error Codes
*2 For details, refer to the following.
Page 87 List of Alarm Codes
3.2

Checking the State of the Module

Open the module diagnostics window of the engineering tool to check the error codes of a temperature input module.
[Diagnostics]  [System Monitor]  Right-click the module to be checked.  "Module Diagnostics"
3 TROUBLESHOOTING
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3.1 Troubleshooting with the LEDs
Description
Indicates the operating status of the module.
On: Normal operation
Flashing (1s cycle): In offset/gain setting mode
Flashing (400ms cycle): The module for online module change selected
Off: 5V power supply interrupted or watchdog timer error occurred, module change for online module change possible
Indicates the error status of the module.
On: Error occurred
Off: Normal operation
Indicates the alarm status of the module.
On: Alert (process alarm or rate alarm) issued
Flashing: Disconnection detected
Off: Normal operation
*1
*2