693
Rotary Encoders
4
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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
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A
B
x 4
.
Signal multiplication
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 always recommended if a high level of im-
munity and/or a long line length are required.The associated strand pairs
must be twisted to achieve maximum immunity.
This interface can also be used as an alternative to 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. Com-
pared with the Open Collector outputs (OC), the push-pull output is
characterized by its better slew rate and increased level of immunity. An
external circuit, such as is necessary with NPN or PNP, is not required.
In addition to improved immunity, this output also still has the inverted
channels. The main area of application for this output is that of medium
switching frequencies. The OC outputs can be replaced by this interface.
In this case, only the non-inverted signals are used.
Encoder
Evaluation unit
Schematic diagram
A
B
A
B
0
0
Introduction
