Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
680 System Manual, 03/2014, A5E02486680-AG
Recognize message end by
message 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.
① Received characters
②Start Message condition satisfied: message timer starts
Message timer expires and terminates the message
Recognize message end by
response timeout
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.
① Transmitted characters
② Received characters
First character must be successfully received by this time.
To Next Page
Loading...
