How To Turn Off The Com.err. Led - Mitsubishi Electric MELSEC-L SERIES Basic User Manual

16.10

How to Turn Off the COM.ERR. LED

The COM.ERR. LED turns on when an error occurs during communications with the connected device. The
COM.ERR. LED does not turn off even after the error cause is removed. Turn it off using the following methods.
(1) Using an I/O signal
Turn off the COM.ERR. LED by turning on COM.ERR. LED OFF request (Y17). An off request continues to be
issued while COM.ERR. LED OFF request (Y17) is on. However, this method does not clear the error information
in the error log area in the buffer memory.
(2) Using a dedicated instruction
Turn off the COM.ERR. LED using the ERRCLR instruction. (
also clear the error information (initial error code, open error code) or the error log.
(3) In the "Ethernet Diagnostics" window
Turn off the COM.ERR. LED by clicking the
this method does not clear the error information in the error log area in the buffer memory. For the window, refer
to "Ethernet Diagnostics".
( Page 300, Section 16.8)
(4) Using the MC protocol
Turn off the COM.ERR. LED using the dedicated command for the MC protocol (LED off, Error code initialization:
1617). For details, refer to the following.
MELSEC Communication Protocol Reference Manual
[COM.ERR.] LED OFF request
signal (Y17)
[COM.ERR.] LED ON
signal (X1C)
Error timing
(LED: ON) (LED: OFF) (LED: ON)
Error Error Error
Page 226, Section 15.11) This method can
button in the "Ethernet Diagnostics" window. However,
CHAPTER 16 TROUBLESHOOTING
303
16