Rockwell Automation 2080-LC50 Micro830 and Micro850 Programmable Controllers User Manual - Manual (Page 139)

Rockwell Automation Publication 2080-UM002F-EN-E - December 2013 123
Use the High-Speed Counter and Programmable Limit Switch Chapter 8
HSC Mode 7 – Quadrature Counter (phased inputs A and B) With External
Reset and Hold
Blank cells = don’t care,
⇑
= rising edge,
⇓
= falling edge
HSC Mode 8 – Quadrature X4 Counter
HSC Mode 7 Examples
Input
Terminals Embedded Input 0 Embedded Input 1 Embedded Input 2 Embedded Input 3 CE Bit Comments
Function Count A Count B Z reset Hold
Example 1
(1) ⇑
off (0) off (0) on (1) HSC Accumulator + 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 0…11 are available for use as inputs to other functions regardless of the HSC being used.
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