S5-115F Manual STEP 5 Operations
3.2.6 Conversion Operations
Conversion operations convert the values in ACCUM 1. Table 3-16 provides an overview of the
conversion operations. Examples follow the table.
Table 3-16. Overview of Conversion Operations
Operation MeaningOperand
CFW One's complement
The contents of ACCUM 1 are inverted bit by bit.
CSW
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Two's complement
The contents of ACCUM 1 are inverted bit by bit. Afterwards the
word 0001
H
is added.
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 ( 3.4).
CFW
015
ExplanationSTL
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L DW 12
CFW
T QW 20
Load the contents of data word DW 12 into ACCUM 1.
Invert all bits in ACCUM 1.
Transfer the new contents of ACCUM 1 to output word QW 20.
Numeric Example
In a system, normally open contacts
have been replaced by normally
closed contacts. If the information
in data word DW 12 is to maintain
its previous effect, DW 12 must be
inverted.
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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 1ACCUM 1
ACCUM 1
DW 12
1 0 0 1 1 1 0 0
EWA 4NEB 811 6149-02
3-51
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