Siemens SIMATIC S7 - Page 518

Libraries
9.4 Open user communication library
S7-200 SMART
518 System Manual, V2.3, 07/2017, A5E03822230-AF
Note that UDP messages are not guaranteed to be delivered. There is no error returned if
the remote device is not present.
Table 9- 19 Parameters of the UDP_SEND instruction
Parameter
Declaration
Data type
Description
EN
IN
BOOL
Enable input
Req IN BOOL The CPU starts the send operation if Req =
TRUE. If Req = FALSE, then the outputs show
the current status of the send operation.
ConnID IN WORD The Connection ID (ConnID) is the number of the
connection for this send operation (defined during
the connect process with UDP_CONNECT).
DataLen IN WORD
The DataLen is the number of bytes to transmit (1
to 1024).
DataPtr IN DWORD The DataPtr is the pointer to the data to be sent.
This is an S7-200 SMART pointer to I, Q, M, or V
memory (for example, &VB100).
IPaddr1
...
IPaddr4
IN BYTE These are the four IP address octets. IPaddr1 is
the most significant byte and IPaddr4 is the least
significant byte of the IP address.
RemPort IN WORD The RemPort is the port number on the remote
device. The remote port number range is 1 to
49151.
Done OUT BOOL The instruction sets the Done output when the
connect operation is complete with no errors.
Busy OUT BOOL The instruction sets the Busy output while the
connection operation is in progress.
Error OUT BOOL The instruction sets the Error output when the
connection operation is complete with an error.
Refer to "Open user communication library in-
struction error codes" (Page 524) for further in-
formation.
Status OUT BYTE The Status output shows the error code if the
instruction sets the Error output. Status is zero
(no error) if the instruction sets the Busy or Done
outputs.