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MELSEC-F
TROUBLESHOOTING11
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POINT
• If the external device communicates normally, the following conditions occur.
For TCP communication
When the external device's open status is complete, LEDs C3, C4, which are
in correspondence with connections 3, 4, turn on.
For UDP communication
When external device communication is possible, LEDs C3, C4, which are in
correspondence with connections 3, 4, turn on.
• In connections used for communication using MC protocol, it is necessary to set
the communication parameter to "MC protocol usable" in "Connection usage" as
described in the table in Subsection 5.5.2, or select "Unpassive open (MC)" or
"Fullpassivel open (MC)" in the open system settings in FX Configurator-EN-L .
Is the IP address of the
command correct?
NO
1)
Correct the IP address and send the
command again.
YES
Are the
command formats,
such as command type, device
designation, and address
designation, designated
correctly?
NO
YES
NO
YES
Check and fix the faulty part.
Correct the command format.
Are there any open
errors or initial errors in the error
log area?
The Ethernet module hardware may
be faulty. Consult your nearest dealer
with the details of the errors.