Allen-Bradley MicroLogix 1400 User Manual

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.
312
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.
313
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.
314
UIE - User Interrupt Enable 315
UIF - User Interrupt Flush Use the UIF instruction to remove selected pending
interrupts from the system.
316
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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Allen-Bradley MicroLogix 1400 Specifications

General

Processor	32-bit
Expansion Modules	Up to 7 expansion I/O modules
Power Supply	24V DC or 120/240V AC
Programming Software	RSLogix 500
Communication Ports	Ethernet, RS-232/RS-485 combo port
Controller Type	Programmable Logic Controller (PLC)
Series	MicroLogix
Digital Outputs	12
Analog Inputs	6 (embedded)
Analog Outputs	2 (embedded)
High-Speed Counter	6 high-speed counters
Pulse Output	2 (embedded)
Ethernet Port	Yes