Rockwell Automation Publication 2080-UM002L-EN-E - November 2021 257
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)
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