190
13 TROUBLESHOOTING
13.1 Troubleshooting with the LEDs
13
TROUBLESHOOTING
This chapter describes the details of errors that may occur when using the I/O module with diagnostic functions and
troubleshooting.
13.1
Troubleshooting with the LEDs
By checking the LED indicator status, primary diagnostics without the engineering tool can be performed to narrow down the
range of causes of error occurrences.
The status of the I/O module with diagnostic functions can be checked with RUN LED, ERR LED, ALM LED, and S MODE
LED. The following table shows the correspondences between the LEDs and the statuses of the I/O module with diagnostic
functions.
*1 For details, refer to the following.
*2 For details, refer to the following.
Page 155 Safety module operation
Name
Description
RUN LED
Displays the module operating status.
On: Normal operation
Off: When 5V power supply was disconnected or a watchdog timer error occurred
ERR LED
Displays the error occurrence status of the module.
On: An error occurred (minor error).
Flashing: An error occurred (moderate error).
Off: Normal operation
ALM LED
Depending on "LED display settings during an error", displays the wait-for-restart state after the safety module is
enabled or the error occurrence state.
When "Do not display I/O error" is set
Flashing (400ms cycle): Wait-for-restart
Off: Normal operation
• When "Always display I/O error" or "Display I/O status and error switching (1 second interval)" is set
A minor error occurrence can be checked.
Page 181 LED indication setting on error condition
S MODE LED
Displays the module operating status (related to SIL2 mode).
On: Safety I/O in operation
Flashing (1s cycle): Safety I/O stopped
Flashing (400ms cycle): Executing the module position check
Off: Operating in normal mode
Summary of Contents for MELSEC iQ-RX40NC6B
Page 1: ...MELSEC iQ R I O Module With Diagnostic Functions User s Manual Application RX40NC6B RY40PT5B ...
Page 2: ......
Page 125: ...4 OVERVIEW 123 4 MEMO ...
Page 191: ...12 MAINTENANCE AND INSPECTION 189 12 MEMO ...
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