Siemens S7-1200 - Page 186

Programming concepts
6.5 Programming language
S7-1200 Programmable controller
186 System Manual, 03/2014, A5E02486680-AG
PEEK(area:=_in_,
dbNumber:=_in_,
byteOffset:=_in_);
Reads the byte referenced by byteOffset of
the referenced data block, I/O or m
emory
area.
Example referencing data block:
%MB100 := PEEK(area:=16#84,
dbNumber:=1, byteOffset:=#i);
Example referencing IB3 input:
%MB100 := PEEK(area:=16#81,
dbNumber:=0, byteOffset:=#i); // when
#i = 3
PEEK_WORD(area:=_in_,
dbNumber:=_in_,
byteOffset:=_in_);
Reads the word referenced by byteOffset of
the referenced data block, I/O or memory
area.
Example:
%MW200 := PEEK_WORD(area:=16#84,
dbNumber:=1, byteOffset:=#i);
PEEK_DWORD(area:=_in_,
dbNumber:=_in_,
byteOffset:=_in_);
Reads the double word referenced by
byteOffset of the referenced data block, I/O or
memory area.
Example:
%MD300 := PEEK_DWORD(area:=16#84,
dbNumber:=1, byteOffset:=#i);
PEEK_BOOL(area:=_in_,
dbNumber:=_in_,
byteOffset:=_in_,
bitOffset:=_in_);
Reads a Boolean referenced by the bitOffset
and byteOffset of the referenced data block,
I/O or memory area
Example:
%MB100.0 := PEEK_BOOL(area:=16#84,
dbNumber:=1, byteOffset:=#ii,
bitOffset:=#j);
POKE(area:=_in_,
dbNumber:=_in_,
byteOffset:=_in_,
value:=_in_);
Writes the value (Byte, Word, or DWord) to
the referenced byteOffset of the referenced
data block, I/O or memory area
Example referencing data block:
POKE(area:=16#84, dbNumber:=2,
byte
Offset:=3, value:="Tag_1");
Example referencing QB3 output:
POKE(area:=16#82, dbNumber:=0,
byteOffset:=3, value:="Tag_1");