Publication 1766-RM001A-EN-P - October 2008
Knowledgebase Quick Starts 643
Example
The following example configures the STI to execute sub-routine file #3
(PFN=3) every 2 seconds (SPM=2000). In the subroutine file there is an
ADD instruction simply adding the value of 1 to N7:0 each time the
sub-routine is scanned.
This example also sets the User Interrupt Enable bit and the Auto Start bit
allowing the STI to execute.
IMPORTANT:
Ladder Logic Subroutine file #3 must be created in order for
this example to work. If the subroutine is not created the CPU will fault
due to a STI Error Code 1 - Invalid File Number for PFN has been
entered.
STI:0.PFN Program File Number defines which subroutine is
executed when the SPM value has timed out. The Integer
number entered must be a valid sub-routine program file
(3…255).
STI:0/AS Auto-Start defines if the STI function will automatically
start when the MicroLogix 1400 enters run or test.
STI:0/UIE User Interrupt Enabled control bit is used to enable or
disable the STI subroutine from processing.
STI:0.SPM Setpoint (in milliseconds) defines the interval that the
interrupt will scan the PFN sub-routine.
efesotomasyon.com - Allen Bradley,Rockwell,plc,servo,drive
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