And Before Or Logic; Or Before And Logic - Siemens Simatic S5-101U Programming Instructions Manual

AND before OR logic
O r i g i n a l
A "1" s i g n a l appears a t o u t p u t
Q
1.1
when t h e output o f a t l e a s t
one o f t h e AND gates i s "1".
STEP 5 r e p r e s e n t a t i o n
A "On s i g n a l appears a t o u t p u t
Q
1.1
when n e i t h e r o f t h e AND
gates has "1" a t i t s output.
Statement
l i s t
OR before AND logic
O r i g i n a l
Ladder
d iagram
ai.
I
ai.1
C o n t r o l system
f l o w c h a r t
C o n t r o l system
f l o w c h a r t
STEP 5 r e p r e s e n t a t i o n
A "1" s i g n a l appears a t o u t p u t Q 1.1
if i n p u t I
1.0
o r I 1.1 and one o f
t h e i n p u t s I 1.2 o r I 1.3 have a "1"
s i g n a l .
Statement
l i s t
A
"0"
s i g n a l appears a t o u t p u t Q 1.1
when i n p u t I
1.0
has a "0" s i g n a l
and t h e AND gate has a "0" a t i t s o u t p u t .
Ladder
diagram