194 Rockwell Automation Publication 2080-UM002M-EN-E - April 2022
Chapter 9 Use the High-Speed Counter and Programmable Limit Switch
The HSCAPP.HPSetting is the upper setpoint (in counts) that defines when the
HSC sub-system generates an interrupt.
The data loaded into the high preset must be less than to the data resident in
the overflow (HSCAPP.OFSetting) parameter or an HSC error is generated.
The HSCAPP.LPSetting is the lower setpoint (in counts) that defines when the
HSC sub-system generates an interrupt.
The data loaded into the low preset must be:
1. Less than or equal to 0 for HSC Mode (HSCAPP.HSCMode) parameter
values 0 and 1 or an HSC error is generated.
2. Greater than or equal to the data resident in the underflow
(HSCAPP.UFSetting) parameter for all HSC Mode (HSCAPP.HSCMode)
or an HSC error is generated.
If the underflow and low preset values are negative numbers, the low preset
must be a number with a smaller absolute value.
The HSCAPP.OFSetting defines the upper count limit for the counter. If the
counter’s accumulated value increments past the value specified in this
variable, an overflow interrupt is generated. When the overflow interrupt is
generated, the HSC sub-system rolls the accumulator over to the underflow
value and the counter continues counting from the underflow value (counts
are not lost in this transition). The user can specify any value for the overflow
position, provided it is greater than the underflow value and falls between
-2,147,483,648 and 2,147,483,647.
The HSCAPP.UFSetting defines the lower count limit for the counter. If the
counter’s accumulated value decrements past the value specified in this
variable, an underflow interrupt is generated. When the underflow interrupt is
generated, the HSC sub-system resets the accumulated value to the overflow
value and the counter then begins counting from the overflow value (counts
are not lost in this transition). The user can specify any value for the underflow
position, provided it is less than the overflow value and falls between
-2,147,483,648 and 2,147,483,647.
Low Preset (HSCAPP.LPSetting)
Description Data Format User Program Access
HSCAPP.LPSetting long word (32-bit INT) read/write
Overflow Setting (HSCAPP.OFSetting)
Description Data Format Type User Program Access
HSCAPP.OFSetting long word (32-bit INT) control read/write
Data loaded into the overflow variable must be greater than the data
resident in the high preset (HSCAPP.HPSetting) or an HSC error is
generated.
Underflow Setting (HSCAPP.UFSetting)
Description Data Format User Program Access
HSCAPP.UFSetting long word (32-bit INT) read/write
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