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FX Series Programmable Controllers

Devices in Detail 4

4-11

4.6

Interrupt Pointers

Device Mnemonic: I

Purpose: Interrupt program marker

Alias: Interrupt

High speed interrupt
I

Available forms: Label: appears on the left of the left hand bus bar when the program is

viewed in ladder mode
(see

in the example device usage diagram).

Devices numbered in: Special numbering system based on interrupt device used and input

triggering method

Further uses: Input interrupts - see page 4-12

Timer interrupts - see page 4-12
Disabling interrupts - see page 4-13
Counter interrupts - see page 4-13

Example device usage:

Additional applied instructions:

•

Interrupts are made up of an interrupt device, an interrupt pointer and various usage of
three, dedicated interrupt applied instructions;

- IRET function 03: interrupt return - see page 5-9
- EI function 04: enable interrupt - see page 5-9
- DI function 05: disable interrupt - see page 5-9

Nested levels:

•

While an interrupt is processing all other interrupts are disabled. To achieve nested inter-
rupts the EI-DI instruction must be programmed within an interrupt routine.
Interrupts can be nested for two levels.

Pointer position:

•

Interrupt pointers may only be used after an FEND instruction (first end instruction, func-
tion 06).

0(S)

FX FX

(2C)

2N(C)

I101

IRET

FEND

END