Siemens SIMATIC S7-1200 - A.9 Communication Interfaces

Basic instructions
8.9 Word logic operations
S7-1200 Programmable controller
328 System Manual, V4.2, 09/2016, A5E02486680-AK
Table 8- 172 Data types for the parameters
Parameter
Data type
Description
IN ENCO: Byte, Word, DWord
DECO: UInt
ENCO: Bit pattern to encode
DECO: Value to decode
OUT ENCO: Int
DECO: Byte, Word, DWord
ENCO: Encoded value
DECO: Decoded bit pattern
Table 8- 173 ENO status
ENO
Condition
Result (OUT)
1
No error
Valid bit number
0
IN is zero
OUT is set to zero
The DECO parameter OUT data type selection of a Byte, Word, or DWord restricts the
useful range of parameter IN. If the value of parameter IN exceeds the useful range, then a
modulo operation is performed to extract the least significant bits shown below.
DECO parameter IN range:
● 3 bits (values 0-7) IN are used to set 1 bit position in a Byte OUT
● 4-bits (values 0-15) IN are used to set 1 bit position in a Word OUT
● 5 bits (values 0-31) IN are used to set 1 bit position in a DWord OUT
Table 8- 174 Examples
DECO IN value
DECO OUT value ( Decode single bit position)
Byte OUT
8 bits
Min. IN
0
00000001
Max. IN
7
10000000
Word OUT
16 bits
Min. IN
0
0000000000000001
Max. IN
15
1000000000000000
DWord OUT
32 bits
Min. IN
0
00000000000000000000000000000001
Max. IN
31
10000000000000000000000000000000