Rockwell Automation 2080-LC50 Micro830 and Micro850 Programmable Controllers User Manual - Manual (Page 238)

222 Rockwell Automation Publication 2080-UM002F-EN-E - December 2013
Appendix D User Interrupts
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)
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)
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.
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)
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.
Sub-Element Description Data Format User Program
Access
AS - Auto Start binary (bit) read only
Sub-Element
Description Data Format Range User Program
Access
SP - Set Point Msec word (INT) 0…65,535 read/write
TIP
The minimum value cannot be less than the time required to scan the
STI POUplus the Interrupt Latency.
Sub-Element Description Data Format User Program
Access
EX - User Interrupt Executing binary (bit) read only