Rockwell Automation Publication 2080-UM002M-EN-E - April 2022 193
Chapter 9 Use the High-Speed Counter and Programmable Limit Switch
HSC Mode 8 – Quadrature X4 Counter
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.
Table 38 - HSC Mode 8 Examples
Embedded Input 1(HSC0) (A) Embedded Input 1(HSC0) (B) Value of CE Bit Accumulator and Counter Action
OFF TRUE Count Up Acc. Value
ON TRUE Count Down Acc. Value
OFF TRUE Count Down Acc. Value
ON TRUE Count Up Acc. Value
OFF TRUE Count Down Acc. Value
ON TRUE Count Up Acc. Value
OFF TRUE Count Up Acc. Value
ON TRUE Count Down Acc. Value
OFF or ON OFF or ON X Hold Acc. Value
X X FALSE Hold Acc. Value
Table 39 - 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
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