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
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