Arithmetic Operations - Siemens S5-100U User Manual

S5-100U
Example: The values of input bytes IB19 and IB20 are compared. If they are equal, output
Q 1.0 is set.
Circuit Diagram
IB19 IB20
C 1 C 2
=
Q 1.0
8.1.7

Arithmetic Operations

Arithmetic operations interpret the contents of the accumulators as fixed-point numbers and
manipulate them. The result is stored in ACCU 1. Table 8-7 provides an overview of the arithmetic
operations. An example follows the table.
Operation Operand
+ F
- F
CPU 102 and higher have integral function blocks for multiplication and division (see section 9.2).
EWA 4NEB 812 6120-02
STL
L IB
L IB
!=F
= Q
Table 8-7. Overview of Arithmetic Operations
Addition
The contents of both accumulators are added.
Subtraction
The contents of ACCU 1 are subtracted from the contents of
ACCU 2.
19
20
IB19
1.0
IB20
Meaning
STEP 5 Operations
CSF/LAD
C 1 F
!=
C 2 Q
Q 1.0
8-31