Predefined Protocol Function - Mitsubishi Electric Q26UD(E)HCPU User Manual

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.
The relevant connection has not been opened.
In "Open Settings" for "Built-in Ethernet port setting" in PLC
parameter, "Predefined protocol" is not selected for "Open
system".
SM1354 (Predefined protocol ready) is not turned on.
Execution instruction for the predefined protocol is
completed with an error.
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.
Communication status of the external device is abnormal.
(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.
(Reading)
The protocol setting data cannot be read.
(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.
If communication is not possible even after taking the above actions, the possible cause is a hardware failure.
Please consult your local Mitsubishi representative.
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Check item
Check item
Corrective action
Perform OPEN processing of the connection with the
external device.
Set the "Open system" to "Predefined protocol".
After the protocol setting is written, turn off and on the power,
reset, or check the protocol setting.
Check the execution result in the completion status area of
the predefined protocol execution instruction and eliminate
the error cause.
Specify the execution protocol number in the control data of
the predefined protocol execution instruction.
Correct the error of the external device.
Corrective action
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.
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.