Mitsubishi Electronics FX1S manual Set and Reset, Resetting timers and counters

FX Series Programmable Controllers Basic Program Instructions 2

2.15Set and Reset

FX1S FX1N FX2N FX2NC

	Mnemonic	Function	Format	Devices	Program steps
	SET	Sets a bit device			Y,M:1
	(SET)	permanently ON	SET	Y, M, S	S, special M
					coils:2
		Resets a bit		Y, M, S, D, V, Z
				(see section	D, special D
	RST	device
	(ReSeT)	permanently	RST	2.16 for timers	registers, V and
				and counters	Z:3
		OFF
				T,C)
Program example:

X0

SET Y0

X1

RST Y0

X2

SET M0

X3

RST M0

X4

SET S0

X5

RST S0

X6

RST D0

0	LD	X	0
1	SET	Y	0
2	LD	X	1
3	RST	Y	0
4	LD	X	2
5	SET	M	0
6	LD	X	3
7	RST	M	0
8	LD	X	4
9	SET	S	0
10	LD	X	5
11	RST	S	0
12	LD	X	6
13	RST	D	0

Basic points to remember:

-Turning ON X0 causes Y0 to turn ON.

Y0 remains ON even after X0 turns OFF.

-Turning ON X1 causes Y0 to turn OFF. Y0 remains OFF even after X1 turns OFF.

-SET and RST instructions can be used for the same device as many times as necessary.

However, the last instruction activated determines the current status.

X0

X1

Y0

-It is also possible to use the RST instruction to reset the contents of data devices such as data registers, index registers etc. The effect is similar to moving ‘K0’ into the data device.

Resetting timers and counters:

• Please see next page.

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