Simple Plc Communication Function - Mitsubishi MELSEC L Series User Manual

15.3.5

Simple PLC communication function

For details on the simple PLC communication function, refer to the following.
MELSEC-L CPU Module User's Manual (Built-In Ethernet Function)
(1) Communication with a communication target station is not possible.
If the specified device data cannot be communicated with a target station, check the following items.
An error was detected in the simple PLC communication
status diagnostics, or Ethernet diagnostics (simple PLC
communication status).
The simple PLC communication status does not change from
"Preparing".
After the simple PLC communication setting was changed,
the CPU module has not been powered off and on or has not
been reset.
The communication retry has occurred in another simple
PLC communication setting configured for communication
with the same target station.
Communication was enabled when the settings for the retry
count and time-out period were increased.
If communication cannot be performed even after taking the above actions, the possible cause is a hardware
failure.
Please consult your local Mitsubishi service center or representative, explaining a detailed description of the
problem.
Check item
CHAPTER 15 TROUBLESHOOTING
Action
Remove the cause of the error.
Check that the cable between the CPU module and the hub
is connected properly and that the hub operates normally.
Power off and on or reset the CPU module to which the
setting is written.
Wait until the communication retry in another simple PLC
communication setting ends. (When two or more settings are
communicated with a target station, do not perform
communications of other settings while the communication of
one setting is being retried.)
• Adjust the settings of the retry count and time-out period.
• Check the status of devices (such as cables, hubs, and
routers) on the Ethernet network, and confirm that the
traffic on the communication line is not heavy.
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