Siemens S7-1200 System Manual page 680

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Communication processor and Modbus TCP

12.3 Point-to-point (PtP) communication

Recognize message end by

message timeout

Recognize message end by

response timeout

The message end occurs when the configured amount of time to wait for the message end

has expired. The message timeout period begins when a start condition has been satisfied.

The default is 200 ms and the range is 0 to 65535 ms.

Received characters

Start Message condition satisfied: message timer starts

Message timer expires and terminates the message

The message end occurs when the configured amount of time to wait for a response

expires before a valid start sequence is received. The response timeout period begins

when a transmission ends and the CM or CB begins the receive operation. The default

response timeout is 200 ms and the range is 0 to 65535 ms. If a character is not received

within the response time period, RCVTIME, then an error is returned to the corresponding

RCV_PTP instruction. The response timeout does not define a specific end condition. It

only specifies that a character must be successfully received within the specified time. You

must configure another end condition to indicate the actual end of a message.

Transmitted characters

Received characters

First character must be successfully received by this time.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG