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

3
TROUBLESHOOTING
This chapter describes errors that may occur in the use of the pulse input module and the corresponding troubleshooting.
3.1

Checking with LEDs

Check the display status of the LEDs to narrow down the possible causes of the trouble. This step is the first diagnostic before
using the engineering tool.
The statuses of the pulse input module can be checked with the RUN LED, ERR LED, and ALM LED. The following table
shows the correspondence of these LEDs and the statuses of the pulse input module.
Name
RUN LED
ERR LED
ALM LED
*1 For details, refer to the following.
Page 52 List of Error Codes
*2 For details, refer to the following.
Page 54 List of Alarm Codes
3 TROUBLESHOOTING
46
3.1 Checking with LEDs
Description
Indicates the operating status of the module.
On: Normal operation
Flashing (400ms cycles): Selected as a module for the online module change
Off: 5V power off, watchdog timer error occurred, or module replacement allowed in the process of the online module
change
Indicates the error status of the module.
On: Error occurred
Off: Normal operation
Indicates the alarm status of the module.
On: Alarm occurred
Off: Normal operation
*1
*2