Rockwell Automation 2080-L50E-24AWB, User Manual, Page: 208 / 390

208 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 10 Use the High-Speed Counter and Programmable Limit Switch
HSC Mode 9 – Quadrature X4 Counter with External Reset and Hold
This parameter is the initial HSC Accumulator value that need to be set when starting the HSC.
This parameter is updated by the HSC sub-system automatically when the HSC is in Counting
mode, reflecting the actual HSC accumulator value.
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.
Table 52 - HSC Mode 9 Examples
Embedded Input
0(HSC0) (A))
Embedded Input
1(HSC0) (B)
Embedded Input
2(HSC0) (Reset)
Embedded Input
3(HSC0) (Hold)
Value of CE Bit Accumulator and Counter Action

OFF X - TRUE Count Up Acc. Value
 ON X - TRUE Count Down Acc. Value
 OFF X - TRUE Count Down Acc. Value
 ON X - TRUE Count Up Acc. Value
OFF

X - TRUE Count Down Acc. Value
ON  X - TRUE Count Up Acc. Value
OFF

X - TRUE Count Up Acc. Value
ON  X - TRUE Count Down Acc. Value
OFF or ON OFF or ON OFF X X Hold Acc. Value
OFF OFF ON X X Reset Acc. to Zero
X X OFF ON X Hold Acc. Value
X X OFF X FALSE Hold Acc. Value
Accumulator (HSCAPP. Accumulator)
Description Data Format User Program Access
HSCAPP.Accumulator long word (32-bit INT) read/write
High Preset (HSCAPP.HPSetting)
Description Data Format User Program Access
HSCAPP.HPSetting long word (32-bit INT) read/write
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