17501 "Quick Start" Selectable Timed Interrupt (Sti) - Allen-Bradley MicroLogix 1400 Instruction Manual

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# 17501 "Quick Start"
Selectable Timed
Interrupt (STI)
Publication 1766-RM001A-EN-P - October 2008
Note:This example was written using a ML1400 communicating to a
ML1000, however any DF1 or DH485 device could have been substituted
for the ML1000. (i.e. MicroLogix 1200, MicroLogix1500, SLC 5/03, 5/04, 5/
05, PLC-5, Bar Code Scanners, etc.)
What is an Interrupt?
An interrupt is an event that causes the processor to suspend the task it is
currently performing, perform a different task, and then return to the
suspend task at the point where it suspended.
STI Definition
The STI provides a mechanism to solve time critical control requirements.
The STI is a trigger mechanism that allows you to scan or solve control
program logic that is time sensitive.
Example: A Block of logic that needs to be scanned more often then the
rest of the ladder program.
Getting Started:
Locate the Function Files under Controller in RSLogix 500/RSLogix Micro
v8.10.00 or later and select the STI tab (See Below)
Enter the following parameters as the "Minimum Configuration" required
for the STI