Allen-Bradley 1770-M11 User Manual download pdf (Page 22)

22 SLC 500™ Chassis–Based Processors

Publication 1747-2.39

Interrupt Routine Instructions

Indirect Addressing

The following sections describe how indirect addressing affects

the execution time of instructions in the SLC 5/03 OS302, SLC 5/

04 OS401, and SLC 5/05 processors. The timing for an indirect

address is affected by:

• the form of the indirect address

• if the indirect address is a source or destination parameter

• whether indirect addressing is used in either a COP, FLL,

FFL/FFU, LFL/LFU, BSR, BSL, or MVM instruction

• whether indirect addressing is used in either an XIC, XIO,

OTU, OTL, OTE, or OSR instruction

For the address forms in the table on the next page, you can

substitute the following file types:

Instruction Mnemonic

and Name

Execution Times (µs)

Function -

Output Instructions

SLC 5/01 SLC 5/02 SLC 5/03

SLC 5/04

SLC 5/05

STD Selectable Timed

Disable

—9 4 3.56

Associated with the Selectable Timed

Interrupt function. STD and STE are used to

prevent an STI from occurring during a portion

of the program; STS initiates an STI.

STE Selectable Timed

Enable

—9 5 5.0

STS Selectable Timed

Start

— 72 58 44.38

IIE I/O Interrupt Enable — 42 16 10.44

The IIE, IID and RPI instructions are used with

specialty I/O modules capable of generating

an I/O interrupt.

IID I/O Interrupt Disable — 39 6 5.81

RPI Reset Pending I/O

Interrupt

— 240

78 + 60 per

added slot

91 + 56 per

added slot

REF I/O Refresh — 240 240 200

When conditions preceding it in the rung are

true, the REF instruction interrupts the

program scan to execute the I/O scan (write

outputs-service comms-read inputs). The

program scan then resumes.

INT Interrupt

Subroutine

— 0 0.25 0.18

Associated with STI interrupts and I/O event-

driven interrupts.

For an Integer (N) For a String (ST)

Input (I) Control (R)

Output (O) Counter (C)

Bit (B) Timer (T)

Floating Point (F)

ASCII (A)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28

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Allen-Bradley 1770-M11 User Manual Page 22

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