13.13.24 Fc 21: Transfer Plc Nck Data Exchange - Siemens SINUMERIK 828D Function Manual

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
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
1045