Download Q Corresponding Ethernet Interface Module User`s Manual (Basic)

11 TROUBLESHOOTING
MELSEC-Q
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 the sequence program.
(1) How to turn off [COM.ERR.] LED using input/output signals
The [COM.ERR.] LED on the front of the Ethernet module is turned on when a
communication error occurs in an external device. (Input/output signal X1C: ON)
(a)
The [COM.ERR.] LED is turned off by turning on the off request signal
(Y17).
[COM.ERR.] LED off request signal (Y17)
(LED on)
(LED off)
(LED on)
[COM.ERR.] LED on signal (X1C)
Error occurrence
Error
occurrence
Error
occurrence
Error
occurrence
(b)
The off request is processed continuously while the off request signal (Y17)
is on.
(c)
The error information in the error log area of the buffer memory is not
cleared (deleted) by turning the off request signal (Y17) is on.
(2) How to turn off [COM.ERR.] LED on the "Ethernet diagnostics"
screen of GX Developer (See Section 11.2.1.)
(a)
Clicking on the COM.ERR off 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) How to read/clear error information using the dedicated instructions
Error information can be read/cleared at arbitrary timing by using the following
dedicated instructions.
(a)
Dedicated ERRRD instruction
Using this instruction, initial abnormal code information or open abnormal
code information can be read.
(b)
Dedicated ERRCLR instruction
Using this instruction, it is possible to turn off [COM.ERR.]LED and clear
initial abnormal code/open abnormal code, or error log.
For the details of the dedicated instruction, see Chapter 10, "Dedicated
Instructions".
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