Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

259 Publication 1763-RM001C-EN-P - October 2009
Chapter 17
Using Interrupts
Interrupts allow you to interrupt your program based on defined events.
This chapter contains information about using interrupts, the interrupt
instructions, and the interrupt function files. The chapter is arranged as
follows:
• Information About Using Interrupts on page 259.
• User Interrupt Instructions on page 263.
• Using the Selectable Timed Interrupt (STI) Function File on page
268.
• Using the Event Input Interrupt (EII) Function File on page 272.
See also: Using the High-Speed Counter and Programmable Limit Switch
on page 89.
Information About Using
Interrupts
The purpose of this section is to explain some fundamental properties of
the User Interrupts, including:
• What is an interrupt?
• When can the controller operation be interrupted?
• Priority of User Interrupts
• Interrupt Latency
• User Fault Routine
What is an Interrupt?
An interrupt is an event that causes the controller to suspend the task it is
currently performing, perform a different task, and then return to the
suspended task at the point where it suspended. The Micrologix 1100
supports the following User Interrupts:
• User Fault Routine
• Event Interrupts (4)
• High-Speed Counter Interrupts
(1)
• Selectable Timed Interrupt
(1) The MicroLogix 1100 has one HSC Interrupt.
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English