142 Rockwell Automation Publication 2080-UM002K-EN-E - March 2019
Chapter 8 Use the High-Speed Counter and Programmable Limit Switch
Blank cells = don’t care, = rising edge, = falling edge
HSC Mode 3 – Counter with External Direction, Reset, and Hold
Blank cells = don’t care, = rising edge, = falling edge
Inputs 0…11 are available for use as inputs to other functions
regardless of the HSC being used.
HSC Mode 3 Examples
Input Terminals Embedded Input 0 Embedded Input 1 Embedded Input 2 Embedded Input 3 CE Bit Comments
Function Count Direction Reset Hold
Example 1
off
(0)
on
(1)
off
(0)
off
(0)
on (1) HSC Accumulator + 1 count
Example 2
on
(1)
on
(1)
off
(0)
off
(0)
on (1) HSC Accumulator - 1 count
Example3 on
(1)
off
(0)
on
(1)
Hold accumulator value
Example 4 on
(1)
off
(0)
off (0) Hold accumulator value
Example 5 on
(1)
off
(0)
on
(1)
off
(0)
Hold accumulator value
Example 6
Clear accumulator (=0)
Inputs 0…11 are available for use as inputs to other functions
regardless of the HSC being used.
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