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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

1045

13.13.24 FC 21: transfer PLC NCK data exchange

Function

When the Transfer block is called, data are exchanged between the PLC and NCK according to the selected

function code. Data are transferred as soon as FC 21 is called, not only at the start of the cycle.

The "Enable" signal activates the block.

FC 21 is processed only when "Enable" = "1".

The following functions for the data exchange between PLC and NCK are supported:

1. Signal synchronized actions at the NCK - channel

2. Signals synchronized actions from NCK - channel

3. Fast data exchange PLC-NCK (Read function in NCK)

4. Fast data exchange PLC-NCK (Write function in NCK)

5. Update control signals to NCK - channel

6. Update control signals to axes (data byte 2 of the user interface)

7. Update control signals to axes (data byte 4 of the user interface)

Declaration of the function

STL representation

VAR_INPUT

Enable : BOOL ;

Funct: BYTE ;

S7Var : ANY ;

IVar1 : INT ;

IVar2 : INT ;

END_VAR

VAR_OUTPUT

Error : BOOL ;

ErrCode : INT ;

END_VAR

Siemens SINUMERIK 828D Function Manual

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