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I'm a PLC vendor. I have a question about behavior of Modbus-TCP client (master) PLC. In our PLC, TCP connection is opened automatically before sending a query and closed immediately after receiving a reply from a server. End users are not able to control connection open/close. It is done automatically by PLC. So the same port is opened and closed many times in a short time in most practical cases.
I would like to know if this behavior is compliant with standard Modbus implementation. I'm afraid closing connection would be handled separately from query handling.
I would like to know if this behavior is compliant with standard Modbus implementation. I'm afraid closing connection would be handled separately from query handling.