Siemens SIMATIC S5-100U System Manual page 145

S5-100U
Further Reduction in the Execution Time in Normal Mode
Logic operations executed in one input byte, output byte, or flag byte require only 2 µs per logic
operation. Program your control according to example 2.
Example 1:
STL
A I 0.0
AN I 1.1
ON I 2.3
O I 3.5
= Q 4.2
A F 15.1
A F 16.3
AN F 17.7
= Q 4.5
Execution time
Approx. 6 µs/binary operation
EWA 4NEB 812 6120-02b
Example 2:
Time/ µs
5
A
6
AN
6
ON
6
O
8
=
5
A
6
A
6
AN
8
=
56 µs
Execution time
Approx. 4 µs/binary operation
Introduction to STEP 5
Time/ µs
STL
5
I 0.0
2
I 0.1
2
I 0.3
2
I 0.5
8
Q 4.2
5
F 15.1
2
F 15.3
2
F 15.7
8
Q 4.5
36 µs
7-23