SIEMENS
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Siemens D 21.4 · 2017
SIMOTICS servomotors
Technical definitions for AC motors
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Overview
(continued)
Incremental encoder
This encoder senses relative movements and does not supply
absolute position information. In combination with evaluation
logic, a zero point can be determined using the integrated
reference mark, which can be used to calculate the absolute
position.
Incremental encoder IC/IN (sin/cos)
The encoder outputs sine and cosine signals. These can be
interpolated using evaluation logic (usually 2048 points) and the
direction of rotation can be determined.
In the version with DRIVE-CLiQ interface, this evaluation logic is
already integrated in the encoder.
Commutation position
The position of the rotor is required for commutation of a syn-
chronous motor. Encoders with commutation position (also
termed C and D tracks) detect the angular position of the rotor.
Incremental encoder IC/IN (sin/cos), commutation position only for IC
Incremental encoder HTL
Incremental encoder HTL
Zero pulse
G_PM21_EN_00103
Commutation position
Incremental signals
C
D
A
B
Signal period
Reference pulse
G_PM21_EN_00102
0
0
0
V
V
V
A
B
0
Incremental encoders without
DRIVE-CLiQ interface
Encoder
IC2048S/R
Incremental encoder sin/cos 1 V
pp
2048 S/R
with
C and D tracks
Encoder
IN2048S/R
Incremental encoder sin/cos 1 V
pp
2048 S/R
without
C and D tracks
Encoder
HTL2048S/R
Incremental encoder HTL 2048 S/R
Encoder
HTL1024S/R
Incremental encoder HTL 1024 S/R
Incremental encoders with
DRIVE-CLiQ interface
1)
IC22DQ encoder
Incremental encoder 22-bit
(resolution 4194304, internal 2048 S/R)
+ commutation position 11 bit
IN22DQ encoder
Incremental encoder 22-bit
(resolution 4194304, internal 2048 S/R)
without commutation position
Technical specifications
Incremental encoder IC/IN (sin/cos)
without
DRIVE-CLiQ interface
Supply voltage
5 V
Incremental signals per revolution
• Resolution (sin/cos)
2048
• Commutation position
(only for IC)
1 sin/cos
• Reference signal
1
Incremental encoder IC/IN (sin/cos)
with
DRIVE-CLiQ interface
Supply voltage
24 V
Incremental signals per revolution
• Resolution
2
22
bit
• Commutation position in bits
(only for IC)
11
• Reference signal
1
Incremental encoder HTL
without
DRIVE-CLiQ interface
Supply voltage
10 ... 30 V
Incremental signals per revolution
• Resolution (HTL)
2048/1024
• Reference signal
1
1)
Instead of the IC22DQ incremental encoder, the AS24DQI single-turn
absolute encoder is used for SIMOTICS S-1FK7/1FT7.
© Siemens AG 2017