Underflow (Hscsts.unf); Count Direction (Hscsts.countdir); High Preset Reached (Hscsts.hpreached) - Allen-Bradley Micro830 Manual

Chapter 8 Use the High-Speed Counter and Programmable Limit Switch
152

Underflow (HSCSTS.UNF)

Description Data Format
HSCSTS.UNF bit
(1) For Mode descriptions, see HSC Mode (HSCAPP.HSCMode) on page
The Underflow status flag is set (1) by the HSC sub-system 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 utilize, track if necessary, and clear (0) the underflow condition.
Underflow conditions do not generate a controller fault.

Count Direction (HSCSTS.CountDir)

Description Data Format
HSCSTS.CountDir bit
(1) For Mode descriptions, see HSC Mode (HSCAPP.HSCMode) on page
The Count Direction status flag is controlled by the HSC sub-system. When the
HSC accumulator counts up, the direction flag is set (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.

High Preset Reached (HSCSTS.HPReached)

Description Data Format
HSCSTS.HPReached bit
(1) For Mode descriptions, see Count Down (HSCSTS.CountDownFlag) on page
The High Preset Reached status flag is set (1) by the HSC sub-system 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.
(1)
HSC Modes User Program Access
0...9 read/write
140.
(1)
HSC Modes User Program Access
0...9 read only
140.
(1)
HSC Modes
2...9
Rockwell Automation Publication 2080-UM002K-EN-E - March 2019
User Program Access
read/write
151.