Libraries
9.4 Open user communication library
S7-200 SMART
510 System Manual, V2.3, 07/2017, A5E03822230-AF
The TCP_SEND instruction transmits the requested number of bytes (DataLen) from the
requested buffer location (DataPtr) over the existing connection (ConnID). You use the
instruction for both TCP protocol and for ISO-on-TCP protocol.
DataLen, DataPtr, Done,
Busy, Error, Status
The TCP_SEND transmits the requested number of bytes from the
requested buffer location over an existing connection.
The TCP_SEND instruction initiates sending the specified number of bytes when the
following occur:
● The program calls the instruction with the Req input set to TRUE.
● The connection is not currently busy with another send operation.
The Req input is level-triggered. It is recommended that you put a positive edge trigger on
the Req input so that the instruction does not initiate unintended send operations. The
program ignores the Req input while the TCP_SEND is busy. The Done, Busy, and Error
outputs and the Status output byte show the status of the TCP_SEND for each call.
To Next Page
Loading...
