Udp_Send Instruction - Siemens SIMATIC S7 System Manual

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9.4 Open user communication library

This is an example usage of the TCP_RECV instruction:

UDP_SEND instruction

The UDP_SEND instruction transmits the requested number of bytes (DataLen) from the

requested buffer location (DataPtr) to the device specified by the IP address (IPaddr1 –

IPaddr4) and port (RemPort). This instruction is used only for UDP protocol and connections

created with UDP_CONNECT.

UDP_SEND Req, ConnID,

DataLen, DataPtr, IPaddr1,

IPaddr2, IPaddr3, IPaddr4,

RemPort, Done, Busy, Er-

The UDP_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 UDP_SEND is busy. The Done, Busy, and Error

outputs and the Status output byte show the status of the UDP_SEND for each call.

The UDP_SEND instruction transmits the requested number of

bytes from the requested buffer location to the device specified by

the IP address and port.

System Manual, V2.3, 07/2017, A5E03822230-AF

S7-200 SMART

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