Sti Function Configuration; Sti Function Status Information; Rockwell Automation Publication 2080-Um002G-En-E - March - Allen-Bradley Micro830 User Manual

Appendix D User Interrupts
238

STI Function Configuration

STI Program POU
This is the name of the Program Organizational Unit (POU) which is executed
immediately when this STI Interrupt occurs. You can choose any
pre-programmed POU from the drop-down list.
STI Auto Start (STI0.AS)
Sub-Element Description
AS - Auto Start
The AS (Auto Start) is a control bit that can be used in the control program. The
auto start bit is configured with the programming device and stored as part of the
user program. The auto start bit automatically sets the STI Timed Interrupt
Enable (STI0.Enabled) bit when the controller enters any executing mode.
STI Set Point Milliseconds Between Interrupts (STI0.SP)
Sub-Element Data Format
Description
SP - Set Point Msec word (INT)
When the controller transitions to an executing mode, the SP (set point in
milliseconds) value is loaded into the STI. If the STI is configured correctly, and
enabled, the POU in the STI configuration is executed at this interval. This value
can be changed from the control program by using the STIS instruction.
The minimum value cannot be less than the time required to scan the
TIP
STI POUplus the Interrupt Latency.

STI Function Status Information

STI Function status bits can be monitored either in the User Program, or in
Connected Components Workbench, in Debug mode.
STI User Interrupt Executing (STI0.EX)
Sub-Element Description
EX - User Interrupt Executing
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.

Rockwell Automation Publication 2080-UM002G-EN-E - March 2015

Data Format User Program
Access
binary (bit) read only
Range User Program
Access
0...65,535 read/write
Data Format User Program
Access
binary (bit) read only