Rockwell Automation Publication 2080-UM002L-EN-E - November 2021
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Chapter 8 Use the High-Speed Counter and Programmable Limit Switch
For Embedded HSC, valid HSCID value is only 0…5.
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 123
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 23 - 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 24 - 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