udpRcvFromVar

 Function - Receives the contents of a variable from another controller through UDP.

Inputs

Input	Data Type	Range	Unit	Default	Description
En	BOOL	0 to 1	N/A	No default	Execute the function.
sock	DINT	0, 65535	N/A	No default	Socket number, return value from udpCreate.
add[ ]	USINT	0 to 32	N/A	No default	Array which contains information about the server. This includes the sender's IP address.
varName	STRING		N/A	No default	The name of a PxMM variable (or array or structure) that stores data from the sender. The variable should be the same type as what is being sent. See udpSendToVar for more information.

Outputs

Output	Data Type	Range	Unit	Description
OK	BOOL		N/A	Returns TRUE when the function successfully executes. See Function - General Rules.
Q	DINT		N/A	Number of bytes received.

Remarks

• 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.

Figure 1: udpRcvFromVar

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• Limitations

  • Function block instance variable types are not supported.
  • These types of variables cannot be sent or received:
    • Variables defined with a UDFB.
    • The Input and Output variables defined for a sub-program.
  • udpSendToVar and udpRcvFromVar do not automatically swap bytes for big vs. little endian systems.
  • Send / receive functionality is:

    	PCMM / AKD PDMM	PCMM2G	Simulator
    PCMM / AKD PDMM
    PCMM2G
    Simulator

    Compatibility is based on the endianness of the controller's information.
    PCMM and AKD PDMM are big-endian.
    PCMM2G and Simulator are little-endian.

  • 3rd party stand-alone programs on x86 platforms are responsible for endian conversions for UDP telegrams from a AKD PDMM / PCMM.

FBD Language Example

FFLD Language Example

IL Language Example

Not available.

ST Language Example

            udpRcvFromVar( Socket_Number, Add, MyUDPVar )