High-Speed Counter (HSC) instructions Chapter 14
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 323
UNF
Parameter Data type HSC mode User program access
HSCSTS.UNF BOOL 0...9 read/write
The HSC sub-system sets the HSCSTS.UNF status flag to (1) whenever the
accumulated value (HSCSTS.Accumulator) has counted through the underflow
variable (HSCAPP.UFSetting). This bit is transitional and is set by the HSC sub-
system. It is up to the control program to use, track, and clear (0) the underflow
condition.
Underflow conditions do not generate a controller fault.
CountDir
Parameter Data type HSC mode User program access
HSCSTS.CountDir BOOL 0...9 read only
The HSC sub-system controls the HSCSTS.CountDir status flag. When the
HSC accumulator counts up, the direction flag is set to (1). Whenever the HSC
accumulator counts down, the direction flag is cleared (0).
If the accumulated value stops, the direction bit retains its value. The only time the
direction flag changes is when the accumulated count reverses.
This bit is updated continuously by the HSC sub-system whenever the controller
is in a run mode.
HPReached
Parameter Data type HSC mode User program access
HSCSTS.HPReached BOOL 2...9 read/write
The HSC sub-system sets the HSCSTS.HPReached status flag to (1) whenever
the accumulated value (HSCSTS.Accumulator) is greater than or equal to the
high preset variable (HSCAPP.HPSetting).
This bit is updated continuously by the HSC sub-system whenever the controller
is in an executing mode. Writing to this element is not recommended.
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