SIEMENS
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Siemens NC 62 · 2016
5
SINAMICS S120 drive system
Measuring systems
Built-on optoelectronic rotary encoders
> Incremental encoders
■
Function
Incremental encoder (sin/cos 1 V
pp
/RS422/HTL) with cable and
connector, clamp flange or Synchro flange
Incremental encoders 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
modulation 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 refer-
ence signal R. The encoder electronics amplify these signals
and convert them into different output levels.
The following output levels are available:
•
Analog signals sin/cos with level 1 V
pp
In order to obtain a finer resolution, in the case of encoders
with sinusoidal signals, these signals are interpolated in the
higher-level controller.
•
RS422 difference signals (TTL)
In the case of RS422 incremental encoders (TTL), the resolu-
tion can be improved by a factor of four by means of edge
evaluation.
•
HTL (High Voltage Transistor Logic)
Encoders with an HTL interface are designed for applications
with digital inputs with 24 V level.
■
Technical specifications
Article No.
6FX2001-3
....
6FX2001-2
....
6FX2001-4...0
6FX2001-2UK00
Product desigation
Incremental encoder
with sin/cos 1 V
pp
Incremental encoder
with RS422 (TTL)
Incremental encoder
with HTL
Double-track incremental
encoder with RS422
(TTL)
Operating voltage DC
V
p
on encoder
V
5
± 10 %
5
± 10 %
or
10 ... 30
10 ... 30
5
± 5 %
Limit frequency, typ.
kHz
≥
100 (- 3 dB)
≥
200 (- 6 dB)
–
–
–
Scanning frequency, max.
kHz
–
300
300
Track 1: 160
Track 2: 1000
No-load current
consumption, max.
mA
150
150
150
Track 1: 150
Track 2: 150
Signal level
Sinusoidal 1 V
pp
RS422 (TTL)
V
H
≥
21 V
with
I
H
= 20 mA at 24 V
V
L
≤
2.8 V
with
I
L
= 20 mA at 24 V
RS422 (TTL)
Outputs protected against
short circuit to 0 V
Yes
Yes
Yes
Yes
Switching time (10 … 90 %)
rise/fall time
t
+
/t
-
(for 1 m (3.28 ft) cable and
recommended input circuit)
ns
–
≤
50
≤
200
≤
100
Phase angle, signal A to B
Edge spacing, min.
Degrees
90 ± 10
90
90
90
• At 160 kHz
μs
–
–
–
Track 1:
≥
0.8
• At 300 kHz
μs
–
≥
0.45
≥
0.45
–
• At 1 MHz
μs
–
–
–
Track 2:
≥
0.125
Cable length to downstream
electronics, max.
1)
m (ft)
150 (492)
100 (328)
300 (984)
Up to 500 kHz: 100 (328)
Up to 1 MHz: 50 (164)
LED failure monitoring
–
High-resistance driver
High-resistance driver
–
Resolution, max.
S/R
2500
5000
2500
Track 1: 1024
Track 2: 9000
Accuracy
arcsec
± 18 mech. × 3600/
PPR count
z
± 18 mech. × 3600/
PPR count
z
± 18 mech. × 3600/
PPR count
z
Track 1: ± 63
Track 2: ± 12
1)
With recommended cable and input circuitry of the downstream electronics, observe max. permissible cable length of module to be evaluated.
© Siemens AG 2016