Publication 1763-RM001C-EN-P - October 2009
Using Interrupts 269
Selectable Time Interrupt (STI) Function File Sub-Elements Summary
STI Function File Sub-Elements
STI Program File Number (PFN)
The PFN (Program File Number) variable defines which subroutine is
called (executed) when the timed interrupt times out. A valid subroutine
file is any program file (3 to 255).
The subroutine file identified in the PFN variable is not a special file
within the controller; it is programmed and operates the same as any
other program file. From the control program perspective it is unique, in
that it is automatically scanned based on the STI set point.
STI Error Code (ER)
Error codes detected by the STI sub-system are displayed in this register.
The table below explains the error codes.
Selectable Timed Interrupt Function File (STI:0)
Sub-Element Description Address Data Format Type User Program
Access
For More
Information
PFN - Program File Number STI:0.PFN word (INT) control read only 269
ER - Error Code STI:0.ER word (INT) status read only 269
UIX - User Interrupt Executing STI:0/UIX binary (bit) status read only 270
UIE - User Interrupt Enable STI:0/UIE binary (bit) control read/write 270
UIL - User Interrupt Lost STI:0/UIL binary (bit) status read/write 270
UIP - User Interrupt Pending STI:0/UIP binary (bit) status read only 271
TIE - Timed Interrupt Enabled STI:0/TIE binary (bit) control read/write 271
AS - Auto Start STI:0/AS binary (bit) control read only 271
ED - Error Detected STI:0/ED binary (bit) status read only 272
SPM - Set Point Msec STI:0.SPM word (INT) control read/write 272
Sub-Element Description Address Data Format Type User Program
Access
PFN - Program File Number STI:0.PFN word (INT) control read only
Sub-Element Description Address Data Format Type User Program
Access
ER - Error Code STI:0.ER word (INT) status read only
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