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15.3.7 Predefined protocol function
(1) Data communication is not possible
If data communication through the predefined protocol function is not possible, check the following items.
(2) Reading or writing of the protocol setting is not possible.
If reading or writing of the protocol setting is not possible, check the following items.
If communication is not possible even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
Check item Corrective action
The relevant connection has not been opened.
Perform OPEN processing of the connection with the
external device.
In "Open Settings" for "Built-in Ethernet port setting" in PLC
parameter, "Predefined protocol" is not selected for "Open
system".
Set the "Open system" to "Predefined protocol".
SM1354 (Predefined protocol ready) is not turned on.
After the protocol setting is written, turn off and on the power,
reset, or check the protocol setting.
Execution instruction for the predefined protocol is
completed with an error.
Check the execution result in the completion status area of
the predefined protocol execution instruction and eliminate
the error cause.
In the control data of the predefined protocol execution
instruction, the execution protocol number is not specified, or
the specified protocol number is outside the range.
Specify the execution protocol number in the control data of
the predefined protocol execution instruction.
Communication status of the external device is abnormal. Correct the error of the external device.
Check item Corrective action
(Reading)
The protocol setting data cannot be read.
Check whether the protocol setting is written to the target
drive.
If the value for SD1359 to SD1362 (Predefined protocol
setting data error information) is 0 and SD1363 (Number of
protocols registered) is 0, protocol setting has not been
written to the target drive.
(Writing)
At power-on, reset or protocol setting check after the protocol
setting is written to the CPU module, the protocol setting
data error (error code) occurs.
Check that the written protocol setting is correct.
Check SD1359 to SD1362 (Predefined protocol setting data
error information) and correct the protocol where the protocol
setting data error was detected (protocol number, packet
number, component number). After correction, write the
protocol setting again.
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