Modbus Automatic Communication Timeout Monitoring; Writing Access In Multi-Client Operation - Mitsubishi Electric NZ2FTGN User Manual

Modbus automatic communication timeout monitoring

This function monitors the automatic communication of Process data with the master station.
When the TCP/IP connection is disconnected due to a timeout, a fieldbus error occurs.
The monitoring time is set with the parameter "Modbus connection timeout". ( Page 304 Parameter list)
Modbus connection timeout
30000s
0
Connected
TCP/IP connection to
the master station
Not connected
Automatic
communication
Reception
Field bus error
For the operation of the master station when the TCP/IP connection is disconnected during automatic communication, refer to
the following.
• When the master station is the RJ71EN71: Communication timeout time, number of communication retries, abnormal
monitoring time ( MELSEC iQ-R Ethernet User's Manual (Application))
• When the master station is the QJ71MT91: Operating status of the automatic communication function ( MODBUS/TCP
Interface Module User's Manual (Details))

Writing access in multi-client operation

This function sets from which connection would writing be enabled when the parameter "Additional TCP port" is set and up to
two master stations are connected. (The connection is a combination of IP address and port number. Even if the IP address is
the same, if the port number is different, the connection will be different.)
The TCP port number 502 is not related.
The write enabled setting is set with the parameter "Writing access in multi-client operation". ( Page 304 Parameter list)
Counting
down
A timeout has
occurred.
Recovery
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11.4 Functions