Siemens 100-8D Technical Manual page 50

T h e p h o t o s w i t c h i s m o u n t e d o n t h e d e c k a s s e m b l y a n d i s i n a c t i v a t e d b y a t a b o n
t h e c a r r i a g e b l o c k i n g t h e L E D o u t p u t .
c i r c u i t 6D ( s e e F i g u r e 3 - 1 6 ) .
d e c o d e to p r o v i d e a T R K 00 o u t p u t .
g a t e 6C to s e n d a n a c t i v e t r a c k 00 s i g n a l to t h e h o s t c o n t r o l l e r .
d i a g r a m F i g u r e 3 - 1 7 .
TR AC K
SWITCH
PHASE A
PHASE B
PHASE C
TR AC K 00
T h i s s i g n a l is A N D e d i n t e r n a l l y w i t h t h e P h a s e A
T h e h i g h o u t p u t o f t h e L S I c i r c u i t e n a b l e s
F i g u r e 3 - 1 6 .
00 01
J___ L
V-
j -
jr
F i g u r e 3 - 1 7 .
T h e o u t p u t o f C o m p a r a t o r 3A is l o w to L S I
T r a c k 00 L o g i c
02 03 04
J ___ L
i r a c k 00 T i m i n g
3 - 2 1
R e f e r to t i m i n g
05