udpRcvFromVar

This function receives the contents a variable sent from another controller and saves it to a local variable. This allows for the exchange of data across controllers.

Limitations:

Only PDMM, PCMM, and Simulators are supported. PACs are not supported.
FunctionA function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. block instance variable types are not supported.
The following types of variables cannot be sent or received:
- Variables defined with a UDFB"User Defined Function Block" UDFB can be used as a sub-function block in another program of the application. It is described using FBD, LD, ST or IL language. Input / output parameters of a UDFB (as well as private variables) are declared in the variable editor as local variables of the UDFB.
- The Input and Output variables defined for a sub-program.
udpSendToVar and udpRcvFromVar will not automatically swap bytes for big vs. little endian systems.
Send / receive between a Simulator and PDMM/PCMM is not supported.
3rd party stand-alone programs on x86 platforms are responsible for endian conversions for UDP telegrams from a PDMM/PCMM.

En	Description	Execute the function
	Data type	BOOL
	Range	[0,1]
	Unit	n/a
	Default	—
sock	Description	Socket number, return value from udpCreate
	Data type	DINT
	Range	[0,+65535]
	Unit	n/a
	Default	—
add[]	Description	Array which contains information about the server
	Data type	USINT
	Range	[0,32]
	Unit	n/a
	Default	—
varName	Description	The name of a variable to save the data received from the sender. The variable should be the same type as what is being sent. See udpSendToVar.
	Data type	STRING
	Range
	Unit	n/a
	Default	—

OK	Description	Returns true when the function successfully executes. See Function - General rules.
	Data type	BOOL
	Unit	n/a
Q	Description	Number of bytes received
	Data type	DINT
	Unit	n/a

udpRcvFromVar

Description

Arguments

Input

Output

Examples

Structured Text

Ladder Diagram

Function Block Diagram