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P3: Basic PLC Program for SINUMERIK 840D sl

13.13 Block descriptions

Basic Functions

Function Manual, 09/2011, 6FC5397-0BP40-2BA0

1019

Call example

13.13.19 FC 12: AUXFU call interface for user with auxiliary functions

Function

FC AUXFU is generally called on an eventdriven basis in the basic program if the channel transferred in the

input parameter contains new auxiliary functions. The PLC user can extend FC AUXFU with program instructions

for processing his auxiliary function to avoid cyclic polling of the channel DBs. This mechanism permits auxiliary

functions to be processed on a jobdriven basis. FC AUXFU is supplied as a compiled empty block in the basic

program. In this case, the basic program supplies parameter "Chan" with the channel number. The PLC user

knows which channel has new auxiliary functions available. The new auxiliary functions can be determined by the

auxiliary-function change signals in the channel concerned.

Declaration of the function

Explanation of formal parameters

The table below lists all formal parameters of the AUXFU function:

Example

CALL FC 10 ( //Error and operational messages

ToUserIF := TRUE, //Signals from DB 2 are transferred to

//interface

Ack := I6.1); //Acknowledgement of the error message done via

//Input E6.1.

FUNCTION FC 12: VOID //Event control of auxiliary functions

VAR_INPUT

Chan: BYTE ;

END_VAR

BEGIN

BE;

END_FUNCTION

Signal Type Type Value range Remark

Chan I BYTE 0 ... 9 No. of NC channel -1

FUNCTION FC 12: VOID //Event control of auxiliary functions

VAR_INPUT

Chan: BYTE ; //Parameter is supplied by basic program

END_VAR

VAR_TEMP

ChanDB: INT;

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