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11
TROUBLESHOOTING
Contents
Error code
Exception code
Function code
Local station port No.
Target IP address
Target device port No.
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(d)
Error log (error log 1 to 32)
• The error log area stores the 32 latest errors.
• The error log area stores the errors in order of occurrence, starting from
the error log 1.
• If 33 or more errors have occurred, the error logs are overwritten, starting
from the area of the error log 1.
Master function
Automatic
Dedicated instruction
communication
Stores a code corresponding to the error occurred at any timing such as during processing of a
request message from the master, at power-on or when changing a MODBUS device
assignment parameter.
Refer to Section 11.3.3 for the error codes.
Stores an exception code returned from a
slave in reply to a request sent by the
automatic communication function or
dedicated instruction.
Stores the function code with which the error originated.
Stores the local station port No. at error occurrence.
Stores "0" for an error occurred below the TCP/UDP level, at power-on or in parameter setting.
Stores an IP address of the target station at error occurrence.
Stores "0" for an error occurred below the IP level, at power-on or in parameter setting.
Stores the port No. of the target station at error occurrence.
Stores "0" for an error occurred below the TCP/UDP level, at power-on or in parameter setting.
Function
Slave function
When an error occurs
for a request from the
master, stores an
exception code returned
to the master.
MELSEC-Q
GX Developer
Others
connection
Stores "0".
Stores "0".
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