Page 741 - Sensors and Systems - North American Catalog
Basic HTML Version
Rotary Encoders
4
739
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Rotary Encoders
Introduction
A
B
x 4
Quadrupling of signals
The information about rotational direction is lost as a result of linking both
channels A and B.
Correlation between operating speed and output frequency
f =
n in min
-1
x Z
n
60 s
n
max
=
f
max
in Hz, n
max in
min
-1
f
max
x 60 s
Z
z [Pulses per revolution]
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
0
0
1000
2000
3000
4000
5000
n [min
-1
]
f = 150 kHz
f = 100 kHz
f = 50 kHz
f = 25 kHz
Interfaces
Line driver (RS422)
This symmetrical interface is recommended for use whenever a longer
cable length is required. The corresponding core pairs must be twisted for
maximum interference resistance.
This interface can also be used as a replacement for the TTL interface. In
this case, the inverted outputs are not used.
Encoder
Evaluation unit
Schematic diagram
A
R
SPS
R
R
B
A
B
0
A
B
0
0
Push-pull output
The push-pull output is a combination of NPN and PNP outputs. Compared
to open collector outputs, the push-pull output features an improved square
wave. In addition, interference resistance is improved. No external wiring is
required as in NPN or PNP outputs. Push-pull also offers inverted channels.
The main applications of push-pull are within the range of median switching
frequencies. The open collector outputs can be replaced by push-pull by
using only the non-inverted outputs.
Encoder
Evaluation unit
Schematic diagram
A
B
A
B
0
0
