Mitsubishi Electronics FX1S manual Identification of normally closed contacts, Set Stl

FX Series Programmable Controllers STL Programming 3

Once at the discharge point the truck opens its bottom doors (Y13). After a timed duration in which the truck empties its contents, the program checks to see if the repeat mode was selected on the last cycle, i.e. M2 is reset. If M2 was reset (in state S21) the program ‘jumps’ to step S21 and the ore truck is returned for immediate refilling. If M2 is not reset, i.e. it is active, the program cycles back to STL state S0 where the ore truck will wait until the start push button is given.

This is a simple program and is by no means complete but it identifies the way a series of tasks have been mapped to an STL flow.

S 0

X0

X2

Y13

S 21

X1

S 22

T1

S 23

X2

X0

Y10

RST M2

Y11

T1 K70

Y12

M8002		SET S 0
	ZRST	S 21 S 25
STL X0	X2 Y13	SET S 21
S 0
STL		Y10
S 21
	X0
		RST M 2
	X1	SET S 22
STL		Y11
S 22
		K70
		T1
	T1

S 24 Y13

T2 K50

T2

M2 M2

S 25 SET M2

M2

STL			SET		S 23
					Y12
S 23	X2
STL			SET	S 24
					Y13
S 24
					K50
					T2
	T2
		M2
			SET	S 25
	T2	M2
STL					S 0

LD M8002 SET S 0 ZRST 40 S 21 S 25

STL S 0 LD X 0 AND X 2 ANI Y 13 SET S 21 STL S 21 OUT Y 10 LD X 0 RST M 2

LD	X	1	OUT T		2
SET S 22			K		50
STL S 22			LD	T	2
OUT Y 11			ANI	M	2
OUT T		1	SET	S 25
K		70	LD	T	2
LD	T	1	AND	M	2
SET S 23			OUT	S	0
STL S 23			STL	S 25
OUT Y 12			SET	M 2
LD	X	2	LD	M 2
SET S 24			OUT S 21
STL S 24			RET
OUT Y 13			END

		SET	M 2
S 25	M2
				S 21
				RET
				END

Identification of normally closed contacts

This example has used the line convention to identify normally closed contacts, for further variations and different methods used to perform this task please see the information note page 3-3.

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