Set and Reset Bit Device

Bit Device Set and Reset: SET, RST

Function

-SET instruction sets a bit device permanently ON. The turned-on device remains the turned-on status even after SET instruction is turned OFF.

-RST instruction resets a bit device permanently OFF. The turned-on device by SET instruction can be turned OFF and reset by RST instruction.

Instruction

Device address

No. of Steps

Flag

M

X

Y

K

L

F

T

C

S

Z

D

@D

Int.

Error

Zero

Carry

SET

RST

S

o

-

o

-

o

-

1

-

o

-

o

-

o

-

Example)

-Turning ON X00 causes Y00 to turn ON. Y00 remains ON even after X00 turns OFF.

-Turning ON X01 causes Y00 to turn OFF. Y00 remains OFF even after X01 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.

Steps	Instruction	Device
0	LD	X00
1	SET	Y00
2	LD	X01
3	RST	Y00
4	LD	X02
5	SET	M00
6	LD	X03
7	RST	M00
8	LD	X04
9	SET	L00
10	LD	X05
11	RST	L00