Siemens SINUMERIK 828D Function Manual page 1050

P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Basic structure in NCK:
Variable value ranges
The following signals are relevant:
Typ
Signal
e
Enable I
Funct I
S7Var I
IVAR1 I
IVAR2 I
Error O
ErrCode O
1050
Type Value range
BOOL
BYTE 3, 4
ANY S7 data area, except
local data
INT 0 ... 4095
INT -1 ... 4095
BOOL
INT
Comment
= FC 21 active
3: Read data
4: Write data
Source/destination data storage area
Position offset
Semaphore byte
Transfer without semaphore: -1
20: Alignment error
21: illegal position offset
22: Illegal semaphore byte
23: No new data to be read
24: Cannot write data
25: Local data parameterized for
S7Var
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions