Siemens SIMATIC S5 - Arithmetic Operation

STEP 5 Operations S5-115F Manual
3.3.3 Arithmetic Operation
Arithmetic operations increase the contents of ACCUM 1 by a specified value. The parameter
represents this value as a positive or negative number. Table 3-28 shows the essential features of
the ”ADD” operation. An example follows the table.
Table 3-28. Overview of the ”ADD” Operation
Operation MeaningOperand
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ADD Add a constant.
Add byte or word constants.
Parameter
-128 to +127
-32768 to +32767
ID
BF
KF
Processing
An arithmetic operation is executed independently of the RLO. It does not affect the RLO or the
condition codes.
You can subtract by entering a negative parameter.
Even if the result cannot be represented by 16 bits, no carry is made to ACCUM 2, i.e. the contents
of ACCUM 2 are not changed.
STL ExplanationExample
Decrement the constant 1020
H
by 33
and store the result in flag word
FW 28. Afterwards add the constant
256 to the result and store the sum in
flag word FW 30.
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L KH 1020
ADD BF -33
TFW28
ADD KF 256
TFW30
The constant 1020
H
is loaded into
ACCUM 1.
The constant -33
10
is added to
the ACCUM contents.
The new ACCUM contents
(0FFF
H
) are stored in flag word
FW 28.
The constant 256
10
is added to
the last result.
The new ACCUM contents
(10FF
H
) are stored in flag word
FW 30.
3-68 EWA 4NEB 811 6149-02