Festo CPX-2AA-U-I, Electronic Manual

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3. An al ogu e i npu t modu le CPX− 4AE −I
3−29
F est o P. BE −CPX− A X− E N e n 0503 b
3. 4 .5 C h a nn el−s p e c ifi c modu le p a r a m ete r s L i m its
Y ou c a n d ete rm i n e li m its w it h t h e ch a nn el−s p e c ifi c p a r a
m ete r s Low e r li m it " a nd U pp e r li m it " . Th e m ea n i ng o f t h e
li m it p a r a m ete r s d e p e nd s on t h e p a r a m et r ize d d ata f orm at o f
t h e modu le.
W it h d ata f orm at VZ + 15 b its li n ea r s c ale d" , t h e li m its h a v e
t h e f unc ti on o f d efi n i ng t h e s c ali ng e nd v al u es o f t h e d ata
r a ng e. Th is r es u lts i n a n a dd iti on al s c ali ng o f t h e a n al ogu e
v al u es.
If t h e i npu t d ata lie ou tsi d e t h is d ata r a ng e, a d ia gno sti c
m essa g e c a n b e g e n e r ate d w it h a ppropr iate p a r a m et r izi ng .
W it h o t h e r d ata f orm ats t h e d ata r a ng e is al r ea dy d efi n e d by
t h e s c ali ng e nd v al u es. I n t h is c ase, t h e li m its p e rm it d ata
mon it or i ng e v e n w it h i n t h e d ata r a ng e.
D ata for mat
1)
D ata r an g e L imits / sca l in g en d v a l ues
2)
VZ + 15 b its
li n ea r s c ale d
−30000... + 30000 Low e r s c ali ng e nd v al u e:
−30000... + 29999
U pp e r s c ali ng e nd v al u e:
−29999... + 30000
VZ + 12 b its
r i gh t−j u stifie d
0... 4 095 Low e r li m it:
0... 4 09 4
U pp e r li m it:
1... 4 095
VZ + 15 b its
left−j u stifie d
0...32760 Low e r li m it:
0...32759
U pp e r li m it:
1...32760
VZ + 12 b its left−
j u stifie d + d ia gno sis
3)
0...32760 Low e r li m it:
0...32752
U pp e r li m it:
1...32760
1)
VZ = S i gn
A s t h e a n al ogu e i npu ts w it h t h e F i x e d v al u e " d ata f orm ats VZ + 12 b its r i gh t−j u stifie d" ,
VZ + 15 b its left−j u stifie d" a nd VZ + 12 b its left−j u stifie d + d ia gno sis " g e n e r ate on l y po siti v e
si gn als, t h e si gn b it w it h t h ese f orm ats is al w a y s 0.
2)
Th e l ow e r li m it / s c ali ng e nd v al u e mu st al w a y s b e less t h a n t h e upp e r li m it / s c ali ng e nd v al u e.
3)
If t h e m a x . curr e n t v al u es a r e e xc ee d e d , v al u es gr eate r t h a n 4 095 w ill als o b e ou t pu t.
T a b .3 / 19: L i m its or s c ali ng e nd v al u es o f t h e a n al ogu e i npu t modu les