SIEMENS
6/3
Siemens NC 82 · 2017
Measuring Systems Motion Control Encoder
Built-on optoelectronic rotary encoders
Incremental encoders
6
■
Function
Incremental encoders detect relative movement and deliver a
defined number of electrical pulses per revolution, which
represent the measurement of the traveled distance or angle.
Incremental encoders operate on the principle of optoelectronic
scanning of dividing discs with the transmitted light principle. The
light source is a light emitting diode (LED). The light-dark modula-
tion generated as the encoder shaft rotates is picked up by
photoelectronic elements. With an appropriate arrangement of the
line pattern on the dividing disk connected to the shaft and the
fixed aperture, the photoelectronic elements provide two trace
signals A and B at 90° to one another, as well as a reference
signal R.
The encoder electronics amplify these signals and convert them
to different output levels.
The following signal levels are available:
•
Analog signals sin/cos with level 1 V
pp
The analog signal allows the digitization of the trace signals.
In order to obtain a fine resolution, the signals are interpolated
in the higher-level control.
•
RS422 differential signals (TTL)
The resolution can be quadrupled by means of edge
evaluation.
Incremental encoder with sin/cos 1 V
pp
and clamp flange incl. cable with
connector as well as incremental encoder with RS422 and Synchro flange
■
Technical specifications
1)
With recommended cable and input circuitry of the downstream electronics, observe max. permissible cable length of module to be evaluated.
Article No.
6FX2001-3
....
6FX2001-2
....
Product name
Motion Control Encoder
Motion Control Encoder
Product designation
Incremental encoder
with sin/cos 1 V
pp
Incremental encoder
with RS422 (TTL)
Operating voltage DC
V
p
on encoder
V
5 ± 10 %
5 ± 10 %
or
10 ... 30
Limit frequency, typical
kHz
≥
180 (- 3 dB)
≥
450 (- 6 dB)
–
Scanning frequency, maximum
kHz
–
300
No-load current consumption,
maximum
mA
150
150
Resolution, maximum
S/R
2500
5000
Signal level
Sinusoidal 1 V
pp
RS422 (TTL)
Outputs protected against
short circuit to 0 V
Yes
short-time
Yes
Switching time (10 ... 90 %)
rise/fall
t
+
/
t
-
(for 1 m cable and
recommended input circuit)
ns
–
≤
50
Phase angle signal A to B
Edge spacing
Degrees
90 ± 10
90
• At 300 kHz
μs
–
≥
0.45
Cable length to downstream
electronics,
1)
m
150
100 without error signal
50 with error signal
Accuracy
arcsec
± 18 mech. × 3600/PPR count
z
± 18 mech. × 3600/PPR count
z
LED failure monitoring
–
High-resistance driver
Speed, mechanical, maximum
rpm
12000
12000
Starting torque at 20 °C
Nm
≤
0.01
≤
0.01
S/R = signals/revolution
© Siemens AG 2016