Publication 1766-RM001A-EN-P - October 2008
312
Using Interrupts
User Interrupt
Instructions
INT - Interrupt
Subroutine
Instruction Type: input
The INT instruction is used as a label to identify a user interrupt service
routine (ISR). This instruction is placed as the first instruction on a rung
and is always evaluated as true. Use of the INT instruction is optional.
Instruction
Used To:
Page
INT - Interrupt Subroutine
Use this instruction to identify a program file as an
interrupt subroutine (INT label) versus a regular
subroutine (SBR label). This should be the first
instruction in your interrupt subroutine.
STS - Selectable Timed
Start
Use the STS (Selectable Timed Interrupt Start)
instruction to the start the STI timer from the control
program, rather than starting automatically.
UID - User Interrupt
Disable
Use the User Interrupt Disable (UID) and the User
Interrupt Enable (UIE) instructions to create zones in
which I/O interrupts cannot occur.
UIE - User Interrupt Enable
UIF - User Interrupt Flush
Use the UIF instruction to remove selected pending
interrupts from the system.
INT
I/O Interrupt
INT
Execution Time for the INT Instruction
Controller
When Rung Is:
True
False
MicroLogix 1400
0.5460 µs
0.5460 µs
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