Troubleshooting Flowchart - Mitsubishi MELSEC-F User Manual

11 TROUBLESHOOTING

11.5 Troubleshooting Flowchart

Data cannot be communicated.
Check whether or not an error
occurred in the PLC base unit to
which the Ethernet module is installed.
that makes the PLC
Check the status of the applicable
Ethernet module.
Is the Ethernet module's
Is the Ethernet module's
Is the Ethernet module's
Is the connection cable
securely connected?
(binary/ASCII) setting of the
communication data
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This section explains some simple troubleshooting procedures when the Ethernet
module and an external device have communication problems in a flowchart format. ( 1)
POINT
If trouble occurs when using the Ethernet module, check the block status, error
status and others for the Ethernet module using the Ethernet diagnostic function of
FX Configurator-EN described in Section 11.2.2.
Did an error
stop processing
occur?
NO
[RUN] LED on?
YES
[ERR] LED on?
[COM.E] LED on?
Is the data code
correct?
YES
1)
Refer to the troubleshooting section
YES
in the applicable PLC 's user's
manual and fix the problems.
Turn on the PLC and Ethernet module
again.
If the [RUN] LED does not turn on
even after resetting, the Ethernet
module's hardware may be faulty.
Replace the Ethernet module and
NO
restart all the external devices that
communicate with the local station.
Is the connection cable
securely connected?
Check whether or not a parameter
NO
error occurred. If an error is found,
first correct it and then re-download.
Check the error contents using the
NO
diagnostics function of
FX-Configurator-EN.
NO
Lock the cable securely.
Data cannot be sent/received
because the data code is different in
sending node and receiving node
and the command can therefore not
NO
be successfully decoded.
Change the setting in
[Communicational data code] of
[Operational settings] using
FX Configurator-EN.
(See Section 4.6.) (*2)
MELSEC-F
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