Siemens SIMATIC S7 System Manual page 557

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Recognize message end by

message timeout

Recognize message end by

response timeout

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

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.

105BCommunication processor

12.3 Point-to-Point (PtP) communication

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