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204 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 10 Use the High-Speed Counter and Programmable Limit Switch
The HSCMode variable sets the High-Speed Counter to one of 10 types of operation. This
integer value is configured through the programming device and is accessible in the control
program.
The main high-speed counters support 10 types of operation mode and the sub high-speed
counters support 5 types (mode 0, 2, 4, 6, 8). If the main high-speed counter is set to mode 1, 3,
5, 7 or 9, then the resub high-speed counter will be disabled.
For more information on HSC Function Operating Modes and Input Assignments, see HSC
Inputs and Wiring Mapping on page 201 .
HSC Mode 0 – Up Counter
Blank cells = don’t care,

= rising edge,

= falling edge
HSC Mode 1 – Up Counter with External Reset and Hold
HSC Mode (HSCAPP.HSCMode)
Description Data Format User Program Access
HSC Mode word (UINT) read/write
HSC Operating Modes
Mode
Number
Type
0
Up Counter – The accumulator is immediately cleared (0) when it reaches the high preset. A low
preset cannot be defined in this mode.
1
Up Counter with external reset and hold – The accumulator is immediately cleared (0) when it
reaches the high preset. A low preset cannot be defined in this mode.
2 Counter with external direction
3 Counter with external direction, reset, and hold
4 Two input counter (up and down)
5 Two input counter (up and down) with external reset and hold
6 Quadrature counter (phased inputs A and B)
7 Quadrature counter (phased inputs A and B) with external reset and hold
8 Quadrature X4 counter (phased inputs A and B)
9 Quadrature X4 counter (phased inputs A and B) with external reset and hold
Table 43 - HSC Mode 0 Examples
Input Terminals Embedded Input 0 Embedded Input 1 Embedded Input 2 Embedded Input 3 CE Bit Comments
Function Count Not Used Not Used Not Used
Example 1  on (1) HSC Accum 1 count
Example 2

on (1) ß off (0) off (0) Hold accumulator value
Inputs 0…11 are available for use as inputs to other functions regardless of the HSC being used.
Table 44 - HSC Mode 1 Examples
Input Terminals Embedded Input 0 Embedded Input 1 Embedded Input 2 Embedded Input 3 CE Bit Comments
Function Count Not Used Reset Hold
Example 1  on (1) 
off
(0)
off (0) on (1) HSC Accum 1 count
Example 2 on (1) 
off
(0)
on (1) Hold accumulator value
Example3 on (1) 
off
(0)
off (0) Hold accumulator value
Example 4 on (1)  off (0) on (1) 
off
(0)
Hold accumulator value
Example 5  Clear accumulator (=0)