Conversion Operations - Siemens SIMATIC S5-90U System Manual

STEP 5 Operations
8.2.6

Conversion Operations

Conversion operations convert the values in ACCU 1.
conversion operations. Examples follow the table.
Table 8-16. Overview of Conversion Operations
Operation Operand
CFW
CSW
Processing Conversion Operations
Execution of these operations does not depend on the RLO nor does it affect the RLO.
The "CSW" operation sets the condition codes (see section 8.4).
STL
Load the contents of data word DW12 into ACCU 1.
L DW 12
Invert all bits in ACCU 1.
CFW
Transfer the new contents of ACCU 1 to output word QW 20.
T QW 20
15
ACCU 1
0 1 1 1 0 0 0 1
15
ACCU 1 1 0 0 0 1 1 1 0 0 1 1 0 0 0 1 1
8-50
One's complement
The contents of ACCU 1 are inverted bit by bit.
Two's complement
The contents of ACCU 1 are inverted bit by bit. Afterwards the word
0001 is added.
H
Explanation
Numeric Example
DW12
0
1 0 0 1 1 1 0 0
CFW
0
Table 8-16 provides an overview of the
Meaning
In a system, normally open contacts
have been replaced by normally
closed contacts. If the information in
data word DW12 is to maintain its
previous effect, DW12 must be
inverted.
EWA 4NEB 812 6115-02b
S5-90U/S5-95U