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5.1.2
Setting /resetting operations
RS flip-flop for latched signal outputs
O r i g i n a l
I
STEP 5 r e p r e s e n t a t i o n
:'
....
: . : ' : . * . . : : ' L , : : . :
....
: . .
A "1" a t i n p u t I 1.4 r e s e t s t h e
@$@E;:@:
...%..:.
S. . :
i s o n l y necessary if program i s
f l i p - f l o p .
t o be represented i n LAD o r CSF f o r m
on t h e 670/675 programmer. When
If t h e s i g n a l a t i n p u t I 1.4 changes
programming w i t h LAD o r CSF, these
t o "OU, t h i s s t a t u s i s maintained.
NOP
@
operations a r e automat i c a l l y
i n c l uded.
C o n t r o l system
f l o w c h a r t
Statement
l i s t
1 1 4
I17
Q 1
5
RS flip-flop with flags
Ladder
diagram
A I 1 7
I 1.7
Q
1 5
S
Q 1 5
Q
1 5
R
Q 1 5
HOP #f
R
a
O r i g i n a l
I
A "1" a t s i g n a l I 1.7 s e t s t h e f l i p -
I f t h e s e t ( i n p u t I 1.7) and r e s e t
f l o p .
( i n p u t I 1.4) s i g n a l s a r e a p p l i e d
simultaneously, t h e scan o p e r a t i o n
I f t h e s i g n a l a t i n p u t I 1.7 changes
l a s t programmed ( i n t h i s case A I 1.4)
t o "ON, t h i s s t a t u s i s maintained, i.e.
remains e f f e c t i v e d u r i n g p r o c e s s i n g
t h e s i g n a l i s latched.
of t h e remaining program.
A
"1"
a t i n p u t I 1.6 s e t s t h e f l i p -
I f t h e s i g n a l a t i n p u t I 1.3 changes
f l o p .
t o "OM, t h i s s t a t u s i s maintained.
I f t h e s e t ( i n p u t I 1.6) and r e s e t
If t h e s i g n a l a t i n p u t I 1.6 changes
( i n p u t I 1.3) s i g n a l s a r e a p p l i e d s i -
t o "OM, t h i s s t a t u s i s maintained,
mu1 taneously, t h e scanning o p e r a t i o n
i.e.
t h e s i g n a l i s latched.
l a s t programmed ( i n t h i s case A I 1.6)
remains e f f e c t i v e d u r i n g p r o c e s s i n g o f
A
"1"
a t i n p u t I 1.3 r e s e t s t h e
t h e remaining program, i.e.
f l a g F 1.7
f l i p - f l o p .
i s s e t ( s e t t i n g s i g n a l has p r i o r i t y over
t h e r e s e t t i n g s i g n a l ).
5.4
STEP 5 r e p r e s e n t a t i o n
C o n t r o l system
f l o w c h a r t
Statement
Ladder
A
1 1 3
= 0
1 4
I
l i s t
diagram
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