Filter
Top Products
11 - 4
MELSEC-F
TROUBLESHOOTING11
11 - 4
11.1.2 How to turn off COM.ERR LED and to read/clear error information
This section explains how to turn off [COM.ERR] LED and to read/clear error
information using a sequence program.
(1) How to turn off [COM.ERR] LED using buffer memory
The [COM.ERR] LED on the front of the Ethernet module is turned on when a
communication error occurs in an external device. (BFM#28...b4: ON)
(a) The [COM.ERR] LED is turned off by writing "0001
H" to the off request signal
(BFM#1601).
(b) The off processing is performed by writing "0001
H" to BFM#1601.
(c) The error information in the error log area of the buffer memory is not cleared
(deleted) even if "0001
H" is written to BFM#1601.
(2) How to turn off [COM.ERR] LED on the "Ethernet diagnostics"
screen of FX Configurator-EN (See Subsection 11.2.2.)
(a) Clicking on the button turns the [COM.ERR] LED off.
(b) The error information in the error log area of the buffer memory is not cleared
(deleted).
(3) Reading buffer memory to read error information
Read the error information stored in the buffer memory of Ethernet module.
The "Initial alarm code" and each connection's "Open alarm code" are stored in the
following buffer memory.
Initial error code BFM#105
Error code for connection 1 BFM#124
Error code for connection 2 BFM#134
Error code for connection 3 BFM#144
Error code for connection 4 BFM#154
Error code for connection 5 BFM#164
Error code for connection 6 BFM#174
Error code for connection 7 BFM#184
Error code for connection 8 BFM#194
[COM.ERR] LED off request signal
BFM#1601=0001
H
[COM.ERR] LED on
BFM#28, b4
Error occurrence
(LED on) (LED off) (LED off)
(LED on)
(LED on)
R
0000H
W
0001
H
R
0002H
W
0001H
R
0002H
Error
occurrence
Error
occurrence
Error
occurrence
COM.ERR off