3 TROUBLESHOOTING
3.1 Troubleshooting with the LEDs
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3 TROUBLESHOOTING
This chapter describes errors that may occur in the use of the A/D converter 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 the A/D converter module can be checked with the RUN LED, ERR LED, and ALM LED. The following table shows
the correspondence of these LEDs and a state of the A/D converter module.
*1 For details, refer to the following.
Page 108 List of Error Codes
*2 For details, refer to the following.
Page 112 List of Alarm Codes
*3 For details, refer to the following.
Page 217 Disabling the Safety Module
Name Description
RUN LED Indicates the operating status of the module.
On: Normal operation
Flashing (1s cycles): In offset/gain setting mode
Flashing (400ms cycles): Selected as a module for the online module change
Off: 5V power supply interrupted, watchdog timer error occurred, or exchanging the module is allowed in the process of
the online module change.
ERR LED Indicates the error status of the module.
*1
On: Error occurred
Off: Normal operation
ALM LED Indicates the alarm status of the module.
*2
Or indicates the wait-for-restart status after the safety module is disabled.
*3
On: Alert (process alarm or rate alarm) issued
Flashing (1s cycles): Input signal error detected
Flashing (400ms cycles): Wait-for-restart
Off: Normal operation
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