Hitachi NJI-350B Control instructions-11, Start interrupt scan program Interrupt, To 2 , 16 to 19

INT n

Chapter 5 Instruction Specifications

Item number

Control instructions-11

Name

Start interrupt scan program (INTERRUPT)

Ladder format

Condition code

Processing time (∝s)

Remark

R7F4

R7F3

R7F2

R7F1

R7F0

Average

Maximum

INT n

DER

ERR

SD

V

C

z

z

z

z

z

Instruction format

Number of steps

0.5



Condition

Steps

INT n

1

Bit

Word

Double word

Constant

Usable I/O

Other

X

Y

M

CU, CT

WX

WY

WM

TC

DX

DY

DM

R,

TD, SS,

WR,

DR,

n

Interrupt priority

{

0 to 2 , 16 to 19, 20

to 27 (Decimal)

Function

• This instruction declares the start of an interrupt scan program.

• n = 0 to 2 indicates a periodical interrupt scan. n = 16 to 19 indicates interrupt input. n = 20 to 27 indicates an interrupt scan when the counter input exceeds the preset value.

• It is set to the 10 ms periodic scan when n = 0, 20 ms periodic scan when n = 1, and 40 ms periodic interrupt scan when n = 2.

• The smaller the number n, the higher the interrupt priority.

• Always use INT n and RTI in pairs.

• Even if a startup condition is used for INT n, it will be ignored.

• Code the INT n to RTI subroutine program after the END instruction.

• The n in INT n cannot be used more than once within the same program.

Notes

•This instruction is checked prior to execution, and when there is an error, the following error code is set in the special internal output WRF001. Also, the CPU error code '34' is set to special internal output WRF000.

CPU error code	Special internal output	Error code	Error description
34	WRF001	H0005	Duplicate definition of INT
		H0014	INT undefined

Instruction for use

	• The program between INT0 and RTI is started and executed every 10 ms.
END

	INT 0	INT 0
10 ms interrupt scan program
		scan
	RTI

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