S5-95F STEP 5 Operations
8.2.6 Conversion Operations
Conversion operations convert the values in ACCU 1. Table 8-16 provides an overview of the
conversion operations. Examples follow the table.
Table 8-16. Overview of Conversion Operations
Operation MeaningOperand
CFW One's complement
The contents of ACCU 1 are inverted bit by bit.
CSW Two's complement
The contents of ACCU 1 are inverted bit by bit. Afterwards the word
0001
H
is added.
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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).
CFW
015
ExplanationSTL
L DW 12
CFW
T QW 20
Load the contents of data word DW12 into ACCU 1.
Invert all bits in ACCU 1.
Transfer the new contents of ACCU 1 to output word QW20.
Numeric Example
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have been replaced by normally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.
1 0 0 0 1 1 1 0 0 1 1 0 0 0 1 1
15 0
0 1 1 1 0 0 0 1ACCU 1
ACCU 1
DW12
1 0 0 1 1 1 0 0
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