Very High Speed Counter Module - Esco Drives & Automation

1-4 About the Very High Speed Counter Modules
Absolute encoders typically have higher speed requirements (200 KHz
typical) for motion control applications. An absolute encoder has a
unique code associated with each position, so the exact position is
always known, even if the system power is turned off.
EXAMPLE
Example of Multiplying Encoder Mode X1, X2 and X4
Quadrature Encoder
Forward Rotation
A Input
B Input
A
B
Z (Store Count)
(Gate / Reset )
Reverse Rotation
Input A
Input B
Input Z
1734-VHSC
X1 Count
1 2 3
2 1 0
X2 Count
X4 Count
1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 10 11 12
5 4 3 2 1 0
11 10 9 8 7 6 5 4 3 2 1 0
Outputs
Updated
Continuously
X1 Multiplying Encoder Mode
Quadrature input signals are used to count on the leading (up
direction) OR trailing (down direction) edge of A for a bidirectional
count, and channel B is used to determine the direction.
[ B = leads A, Count = Down; B = follows A, Count = Up ]
X2 Multiplying Encoder Mode
Quadrature input signals are used to count on leading AND trailing
edges of A for a bidirectional count, and channel B is used to
determine the direction.
[ B = leads A, Count = Down; B = follows A, Count = Up ]
Publication 1734-UM003A-EN-P - August 2000