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C.3 The Models Constructed for the Case Study Lydia Models
/ / D e f i n i t i o n s o f t w a r e e r r o r
system E r r o r
(
bool A, B ,
bool ERROR
) {
/ / s o f t w a r e i s assumed t o be c o r r e c t ,
/ / so t h e r u l e i s i n d e p e n d e n t of any h e a l t h
ERROR = (A != B) ;
}
/ / D e f i n i t i o n P o t m e t e r / Encoder Unit
system PEU
(
bool POSVAL ERROR,
bool h
) {
}
/ / d e f i n i t i o n b e h a v i o r
POSVAL ERROR => ! h ;
/ / D e f i n i t i o n LUC Extension
system LUC Extension
(
bool e pos ,
bool Pset , Pact ,
bool POSITION ERROR ,
bool h PEU ,
bool h
) {
}
/ / d e f i n i t i o n b e h a v i o r
( P a c t != P s e t ) => POSITION ERROR ;
e p o s = ( P a c t != P s e t ) ; / / by d e f i n i t i o n
h => ( POSITION ERROR => ( e p o s or ! h PEU ) ) ;
/ / D e f i n i t i o n beam p r o p e l l e r movement of t h e f r o n t a l s t a n d .
system FS Beam Propeller Movement
(
bool e pos ,
bool CURRENT ERROR, SPEED ERROR , POSITION ERROR ,
bool POSVAL ERROR,
bool h EXT , h MVR , h MBU , h Stand , h PEU
) {
/ / d e c l a r a t i o n i n t e r m e d i a t e v a r i a b l e s
bool I a c t , I s e t , Vact , Vset , Pact , P s e t ;
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