Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 308)

Preface MicroLogix 1000 Programmable Controllers User Manual
B–20
Address Description Classification Bit
S:23 Reserved NA NA
S:24 Index
Register Status This word indicates the element offset used in
indexed addressing.
R
When an STI, high-speed counter, or Fault
Routine interrupts normal execution of your
program, the original value of this register is
restored when execution resumes.
S:25 to
S:29 Reserved NA NA
S:30 STI
Setpoint Dynamic
Configuration You enter the timebase to be used in the
selectable timed interrupt (STI). The time can
range from 10 to 2550 ms. (This is in 10ms
increments, so valid values are from 0–255.)
Your STI routine executes per the value you
enter. Write a zero value to disable the STI.
To provide protection from inadvertent alteration
of your selection, program an unconditional MOV
instruction containing the setpoint value of your
STI to S:30, or program a CLR instruction at S:30
to prevent STI operation.
If the STI is initiated while in the REM Run mode
by loading the status registers, the interrupt starts
timing from the end of the program scan in which
the status registers were loaded.
S:31 to
S:32 Reserved NA NA