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Publication 1763-RM001C-EN-P - October 2009
112
Using the High-Speed Counter and Programmable Limit Switch
HSC Mode 7 - Quadrature Counter (phased inputs A and B) With External Reset
and Hold
Blank cells = don’t care,
⇑
= rising edge,
⇓
= falling edge
TIP
Inputs I1:0.0/0 through I1:0.0/3 are available for use as
inputs to other functions regardless of the HSC being
used.
HSC Mode 7 Examples
Input
Terminals
I1:0.0/0 (HSC0)
I1:0.0/1 (HSC0)
I1:0.0/2 (HSC0)
I1:0.0/3 (HSC0)
CE
Bit
Comments
Function
Count A
Count B
Z reset
Hold
Example 1
(1)
⇑
off (0)
off (0) on (1) HSC Accum 1 count
Example 2
(2)
⇓
off (0)
off (0)
off (0) on (1) HSC Accumulator - 1 count
Example3
⇓
off (0)
off (0)
on (1)
Reset accumulator to zero
Example 4
on (1)
Hold accumulator value
Example 5
on (1)
Hold accumulator value
Example 6
off (0)
on (1)
Hold accumulator value
Example 7
off (0)
off (0) Hold accumulator value
(1) Count input A leads count input B.
(2) Count input B leads count input A.
TIP
Inputs I1:0.0/0 through I1:0.0/3 are available for use as
inputs to other functions regardless of the HSC being
used.
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