Rockwell Automation Publication 2080-UM002L-EN-E - November 2021 259
Appendix D User Interrupts
STI Function Status Information
STI Function status bits can be monitored either in the User Program, or in the
Connected Components Workbench software, in Debug mode.
STI User Interrupt Executing (STI0.EX)
The EX (User Interrupt Executing) bit is set whenever the STI mechanism
completes timing and the controller is scanning the STI POU. The EX bit is
cleared when the controller completes processing the STI subroutine.
The STI EX bit can be used in the control program as conditional logic to detect
if an STI interrupt is executing.
STI User Interrupt Enable (STI0.Enabled)
The User Interrupt Enable bit is used to indicate STI enable or disable status.
STI User Interrupt Lost (STI0.LS)
The LS is a status flag that indicates an interrupt was lost. The controller can
process 1 active and maintain up to 1 pending user interrupt conditions before
it sets the lost bit.
This bit is set by the controller. It is up to the control program to utilize, track,
the lost condition if necessary.
STI User Interrupt Pending (STI0.PE)
The PE is a status flag that represents an interrupt is pending. This status bit
can be monitored or used for logic purposes in the control program if you need
to determine when a subroutine cannot execute immediately.
This bit is automatically set and cleared by the controller. The controller can
process 1 active and maintain up to 1 pending user interrupt conditions before
it sets the lost bit.
Using the Event Input
Interrupt (EII) Function
The EII (Event Input Interrupt) is a feature that allows the user to scan a
specific POU when an input condition is detected from a field device.
EII0 is used in this document to define how EII works.
Sub-Element Description Data Format User Program Access
EX - User Interrupt Executing binary (bit) read only
Sub-Element Description Data Format User Program Access
Enabled - User Interrupt Enable binary (bit) read only
Sub-Element Description Data Format User Program Access
LS - User Interrupt Lost binary (bit) read/write
Sub-Element Description Data Format User Program Access
PE - User Interrupt Pending binary (bit) read only
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