Siemens SIMATIC S5-100U System Manual page 164

STEP 5 Operations
OR before AND Operation
Output Q 1.0 is "1" when both OR conditions have been
satisfied.
Output Q 1.0 is "0" when at least one OR condition has not
been satisfied.
STL
A(
O I 0.0
O I 0.1
)
A(
O I 0.2
O I 0.3
)
= Q 1.0
8-6
Example
CSF
I 0.0
=1
>
&
I 0.1
I 0.2
=1
>
I 0.3
Circuit Diagram
I 0.0
I 0.2
I 0.0
I 0.1
Q 1.0
S5-100U
I 0.1
I 0.3
Q 1.0
LAD
Q 1.0
I 0.2
I 0.3
EWA 4NEB 812 6120-02b