Mitsubishi Electric Melsec iQ-R Series User Manual page 76

Check alarm codes, error history, and alarm history on the Event History window of the engineering tool.
[Diagnostics]  [System Monitor]  [Event History] button
Module Information List
Switch the tab to the "Module Information List" tab and check each status information of the A/D converter module.
Item
LED information
Input signal error detection
4 TROUBLESHOOTING
74
4.2 Checking the State of the Module
Description
Indicates the LED status of the A/D converter module.
Indicates the input signal error detection status of the A/D converter module for each channel.