Mitsubishi Melsec-L Series User Manual page 318

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2) When the following problem occurs at the time of access to other station
CPU module, clear the programmable controller CPU information and
retry. (Refer to Section 15.5.)
• Accessible device range is narrowed. (Error code: 7140
• Some of commands and/or devices cannot be used.
(Error code: 7142
(b) When response messages cannot be received
Change the setting value for the response monitoring time (timer 1, default
value is 5 seconds).
(Refer to the User's Manual (Application).)
If response messages still cannot be received after changing the setting value,
check the communication protocol setting of the corresponding interface, the
ON status of the indicator LED, and the connection cable.
(c) When the first part of a response message cannot be received
Increase the setting value of the message wait time (the default value is 0 ms).
(Refer to the User's Manual (Application).)
If response messages still cannot be received after increasing the setting
value, it is necessary to reduce the processing time from the end of
transmission processing to the start of reception processing on the external
device side.
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15 TROUBLESHOOTING
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