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Allen-Bradley MicroLogix 1200 Reference Manual

Allen-Bradley MicroLogix 1200
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Publication 1762-RM001C-EN-P
18-12 Using Interrupts
Using the Selectable
Timed Interrupt (STI)
Function File
The Selectable Timed Interrupt (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 of where you would use the STI are:
PID type applications, where a calculation must be performed at a
specific time interval.
A motion application, where the motion instruction (PTO) needs to be
scanned at a specific rate to guarantee a consistent acceleration/
deceleration profile.
A block of logic that needs to be scanned more often.
How an STI is used is typically driven by the demands/requirements of
the application. It operates using the following sequence:
1. The user selects a time interval.
2. When a valid interval is set and the STI is properly configured, the
controller monitors the STI value.
3. When the time period has elapsed, the controllers normal operation is
interrupted.
4. The controller then scans the logic in the STI program file.
5. When the STI file scan is completed, the controller returns to where it
was prior to the interrupt and continues normal operation.

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Allen-Bradley MicroLogix 1200 Specifications

General IconGeneral
SeriesMicroLogix 1200
TypeProgrammable Logic Controller (PLC)
MountingDIN rail or panel mount
Programming LanguageLadder Logic
Programming SoftwareRSLogix 500
I/O PointsUp to 40
Communication PortsRS-232, RS-485
Memory6 KB user memory
Power Supply24V DC or 120/240V AC
ExpansionSupports expansion I/O modules
Operating Temperature0°C to 55°C (32°F to 131°F)
Dimensions90 mm x 110 mm
Weight0.5 kg (1.1 lbs)

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