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Санкт-Петербургский государственный электротехнический университет "ЛЭТИ"

Предмет:

Электротехника

Файл:

Jack H.Automating manufacturing systems with PLCs.2005.pdf

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plc states - 12.34

12.4 PRACTICE PROBLEM SOLUTIONS

IDLE	Time Button

Timer Done + Cancel Button + Door Open

COOK		Time Button
COOK
	Cancel Button	CLOCK
	Cancel Button	SET
		SET
		Power Button

Start Button

COOK

TIME SET

T1 = FS

)

S1 = ( S1 + T1 + T3 + T5)

P = S1 + S2

T2 = S1( BA

T3 = S2( E( C + D + F) )

Q = S0 + S2

S2 = ( S2 + T2) T3

T4 = S1(

)

S0 = ( S0 + T4

)

R = S0 + S1

F + E

T5 = S0( A( C +

) )

plc states - 12.35

T1 = ST1 • A

ST1 = ( ST1 + T2 + T4 + T6)

T2 = ST2 •

ST2 =

( ST2 + T1 T3 T5) T2

T3 = ST1 •

ST3 =

( ST3 + T3

)

T4 = ST3 •

ST4 = ( ST4 + T5 + FS)

T5 = ST1 • E

T6 = ST4 •

ST1

ST2

ST1

ST3

ST1

ST4

ST1

ST2

ST3

ST4

plc states - 12.36

FS = first scan

T1 = ST2 A

ST1

ST3

T2 = ST1 B

C * B

T3 = ST3 ( C B)

T4 = ST2 ( C + B)

ST1 = ( ST1 + T1)

+ FS

ST2 = ( ST2 + T2 + T3)

ST2

C + B

ST3 = ( ST3 + T4 T1) T3

ST2

ST1

ST3

ST2

ST1

first scan

ST2

ST3

T4 T1

plc states - 12.37

TA = ST2 A

ST1 = ( ST1 + TA + TC)

TB = ST1 B

ST2 = ( ST2 + TB + TF) TA TE

TC = ST3

ST3 = ( ST3 + TD + TE) TC TF

TD = ST1 D

TE = ST2 E

TF = ST3

ST2

ST1

ST3

ST1

ST2

ST3

ST1

ST2

ST3

plc states - 12.38

button A + button B

	door idle	motor on
	door idle	door opening
		door opening

counter > 20,000

thermal relay + 15 sec delay

service mode

reset button - assumed

b)	Legend
b)	button A	I:001/01
	button A	I:001/01
	button B	I:001/02
	motor	O:000/03
	thermal relay	I:001/03
	reset button	I:001/04 - assumed
	state 1	B3:0/0
	state 2	B3:0/1
	state 3	B3:0/2
	lamp	O:000/07

plc states - 12.39

first scan	MCR
first scan
		state 1
	L

		state 2
	U	state 2
	U	state 3
	U	state 3
	U
	MCR
state 2		motor
state 2		motor

state 3		light

state 1	MCR
state 1

button A	L	state 2


		state 1
button B	U



	MCR
	MCR

plc states - 12.40

state 2

T4:0/DN

thermal relay

C5:0/DN

MCR

TON

T4:0 base 1 preset 15

state 1

state 2

CTU

C5:0

preset 20000

state 3

state 2

state 1

MCR

plc states - 12.41

state 3	MCR
state 3

reset button ??	L	state 1


		state 3
	U

		counter
	RES	counter
	MCR

c)S0 = ( S0 + S1( delay( 15) + thermal) ) S0( buttonA + buttonB)

S1 = ( S1 + S0( buttonA + buttonB) ) S1( delay( 15) + thermal) S3( counter)

S3 = ( S3 + S2( counter) ) S3( reset)

motor = S1 light = S3

plc states - 12.42

a) block logic method		door
		closed
remote OR button OR			(state 3)
	bottom limit
door
		light sensor

closing (state 2)

	remote OR button	door
	remote OR button	opened
		opened
		(state 1)

remote OR button

door opening (state 4)

remote OR button OR top limit

plc states - 12.43

first scan		L	state 1
		L
		U	state 2
		U
		U	state 3
		U
		U	state 4
		U
state 2			close door
state 4			open door
state 2	TOF
	TOF
	T4:0
	preset 300s
state 4
T4:0/DN		garage light
		garage light
state 1	MCR
	MCR
remote	U	state 1
		state 1

button	L	state 2
		state 2

	MCR

plc states - 12.44

state 2	MCR
	MCR
remote	U	state 2
		state 2

button	L	state 3
		state 3

bottom limit
light beam	U	state 2
		state 2

	L	state 4
	L
	MCR
state 3	MCR
	MCR
remote	U	state 3
		state 3

button	L	state 4
		state 4

	MCR

plc states - 12.45

state 4	MCR
	MCR
remote	U	state 2
		state 2

button	L	state 3
		state 3

top limit
	MCR

plc states - 12.46

b) state-transition equations

door

closed

remote OR button

(state 3)

remote OR button OR bottom limit

door

light sensor

closing

opening

(state 2)

(state 4)

remote OR button

door

remote OR button OR top limit

opened

(state 1)

using the previous state diagram.

ST1 = state 1

T1 = state 1 to state 2

ST2 = state 2

T2 = state 2 to state 3

ST3 = state 3

T3 = state 2 to state 4

ST4 = state 4

T4 = state 3 to state 4

FS = first scan

T5 = state 4 to state 1

ST1 = ( ST1 + T5)

T1 = ST1 ( remote + button)

T2 = ST2 ( remote + button + bottomlimit)

ST2 = ( ST2 + T1) T2 T3

T3 = ST2 ( remote + button)

ST3 = ( ST3 + T2)

T4 = ST3 ( lighbeam)

ST4 = ( ST4 + T3 + T4)

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

ST1

ST2

ST3

ST4

plc states - 12.47

remote

button

remote

button

bottom limit

remote

button

light beam

remote

button

top limit

first scan

plc states - 12.48

T1		ST1
		T5
T2	T3	ST2
		T1
T4		ST3
		T2
T5		ST4
		T3
		T4
ST2
ST4
ST2
ST4
T4:0/DN

ST1

ST2

ST3

ST4

close doo

open doo

TOF

T4:0 preset 300s

garage light

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