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Automating Manufacturing Systems - Process Control and ...

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plc states - 12.46<br />

b) state-transition equations<br />

door<br />

closed<br />

(state 3)<br />

remote OR button OR bottom limit<br />

remote OR button<br />

door<br />

closing<br />

(state 2)<br />

light sensor<br />

door<br />

opening<br />

(state 4)<br />

remote OR button<br />

door<br />

opened<br />

(state 1)<br />

remote OR button OR top limit<br />

using the previous state diagram.<br />

ST1 = state 1<br />

ST2 = state 2<br />

ST3 = state 3<br />

ST4 = state 4<br />

FS = first scan<br />

ST1 = ( ST1 + T5) ⋅ T1<br />

ST2 = ( ST2 + T1) ⋅T2 ⋅T3<br />

ST3 = ( ST3 + T2) ⋅ T4<br />

ST4 = ( ST4 + T3 + T4) ⋅ T5<br />

T1 = state 1 to state 2<br />

T2 = state 2 to state 3<br />

T3 = state 2 to state 4<br />

T4 = state 3 to state 4<br />

T5 = state 4 to state 1<br />

T1 = ST1 ⋅ ( remote + button)<br />

T2 = ST2 ⋅ ( remote + button + bottomlimit)<br />

T3 = ST2 ⋅ ( remote + button)<br />

T4 = ST3 ⋅ ( lighbeam)<br />

T5 = ST4 ⋅ ( remote + button + toplimit) + FS

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