Publication 1762-RM001C-EN-P
18-10 Using Interrupts
UIE - User Interrupt
Enable
Instruction Type: output
The UIE instruction is used to enable selected user interrupts. The table
below shows the types of interrupts with their corresponding enable bits:
To enable interrupt(s):
1. Select which interrupts you want to enable.
2. Find the Decimal Value for the interrupt(s) you selected.
3. Add the Decimal Values if you selected more than one type of
interrupt.
4. Enter the sum into the UIE instruction.
For example, to enable EII Event 1 and EII Event 3:
EII Event 1 = 32, EII Event 3 = 4
32 + 4 = 36 (enter this value)
UIE
User Interrupt Enable
Interrupt Types 4
UIE
Table 18.6 Execution Time for the UIE Instruction
Controller When Rung Is:
True False
MicroLogix 1200 0.8
µ
s0.0
µ
s
MicroLogix 1500 0.8
µ
s0.0
µ
s
Table 18.7 Types of Interrupts Disabled by the UIE Instruction
Interrupt Element Decimal
Value
Corresponding
Bit
EII - Event Input Interrupts Event 0 64 bit 6
EII - Event Input Interrupts Event 1 32 bit 5
HSC - High-Speed Counter HSC0 16 bit 4
EII - Event Input Interrupts Event 2 8 bit 3
EII - Event Input Interrupts Event 3 4 bit 2
HSC - High-Speed Counter
(1)
(1) The MicroLogix 1200 has one HSC Interrupt, HSC0. The MicroLogix 1500 has two, HSC0 and HSC1.
HSC1 2 bit 1
STI - Selectable Timed Interrupts STI 1 bit 0
Note: Bits 7 to 15 must be set to zero.
ATTENTION
!
If you enable interrupts during the program scan via an
OTL, OTE, or UIE, this instruction must be the last
instruction executed on the rung (last instruction on last
branch). It is recommended this be the only output
instruction on the rung.
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