Siemens SINUMERIK 840DE SL - Page 1142

Detailed description
2.12 Block descriptions
Power Line Basic PLC Program (P3)
2-230 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Call example
1. Read double word of position offset 4 with semaphore in byte 0 and store in MD 100:
Data type Dword (4 bytes)
Position offset 4
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CALL FC 21 (
Enable := M 10.0, // if True, FC 21
is active
Funct := B#16#3, //Read data
S7Var := P#M 100.0 DWORD 1,
IVAR1 := 4,
IVAR2 := 0,
Error := M 10.1,
ErrCode := MW12);
UN M10.1; //Enable while 1, until value is read
R F10.0;
Examples of NCK programming:
Data transfer from NC to PLC, with data written via synchronized actions;
Byte 0 serves as the semaphore
ID=1 WHENEVER $A_DBB[0] == 0 DO $A_DBR[4] = $AA_IM[X] $A_DBB[0] = 1