CODEWITHSUNDEEP
tcpmodbus
i486
i486

Reputation: 6573

Modbus TCP client - new connection for every command

Is there practice to use the same TCP connection for long time and send thousands of Modbus commands there or in most cases a new connection is opened and closed for every Modbus command?

Upvotes: 0

Views: 62

Answers (1)

Brits
Brits

Reputation: 18380

See page 10 of the MODBUS MESSAGING ON TCP/IP IMPLEMENTATION GUIDE V1.0b which provides guidance including:

It is recommended to keep the TCP connection opened with a remote device and not to open and close it for each MODBUS/TCP transaction

Opening a connection takes some time, and consumes resources. There is generally no need to disconnect/reconnect per transaction (but I have encountered devices that drop the connection after responding to a request).

Upvotes: 3

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