Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
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Appendix D User Interrupts
Using the Selectable Timed
Interrupt (STI) Function
Configure the STI function from the Interrupt Configuration window.
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:
Table 55 - Types of Interrupts Disabled by the UIC Instruction
Interrupt Type
Element
Decimal Value
Corresponding Bit
Plug-In Module
UPM4
8388608
bit 23
Plug-In Module
UPM3
4194304
bit 22
Plug-In Module
UPM2
2097152
bit 21
Plug-In Module
UPM1
1048576
bit 20
Plug-In Module
UPM0
524288
bit 19
STI - Selectable Timed Interrupt
STI3
262144
bit 18
STI - Selectable Timed Interrupt
STI2
131072
bit 17
STI - Selectable Timed Interrupt
STI1
65536
bit 16
STI - Selectable Timed Interrupt
STI0
32768
bit 15
EII - Event Input Interrupt
Event 7
16384
bit 14
EII - Event Input Interrupt
Event 6
8192
bit 13
EII - Event Input Interrupt
Event 5
4096
bit 12
EII - Event Input Interrupt
Event 4
2048
bit 11
HSC - High-Speed Counter
HSC5
1024
bit 10
HSC - High-Speed Counter
HSC4
512
bit 9
HSC - High-Speed Counter
HSC3
256
bit 8
HSC - High-Speed Counter
HSC2
128
bit 7
HSC - High-Speed Counter
HSC1
64
bit 6
HSC - High-Speed Counter
HSC0
32
bit 5
EII - Event Input Interrupt
Event 3
16
bit 4
EII - Event Input Interrupt
Event 2
8
bit 3
EII - Event Input Interrupt
Event 1
4
bit 2
EII - Event Input Interrupt
Event 0
2
bit 1
UFR - User Fault Routine Interrupt
UFR
1
bit 0 (reserved)