Size 21 Optical Encoders

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Allied Motion’s S21 series are cost-effective, hollow shaft modular optical encoders that are easy to mount and offer both incremental and absolute output formats. These compact, standard size 21 (2.1 in diameter) encoders have their own bearing system and are housed in a high-grade glass filled plastic resin shell with an IP40 protection rating.

The S21 series' features include up to 10,000 RPM shaft speed, software configurable resolution, and eight format types including sine-cosine, high-count incremental (to 2.1 million CPR), and serial and parallel absolute versions.

The table below summarizes the performance of the S21 encoder series.

Series Frame Size (mm) Length (mm) Type Format Resolution Frequency Response (MHz) Product Informatiom
Series
S21A
Frame Size (mm)
53
Length (mm)
31
Type
Incremental
Format
Sine/Cosine
Resolution
1000, 1024, 4096
Frequency Response (MHz)
0.1
Product Informatiom
Series
S21B
Frame Size (mm)
53
Length (mm)
31
Type
Absolute
Format
Serial, SSI binary
Resolution
8 - 16-bit binary
Frequency Response (MHz)
5
Product Informatiom
Series
S21C
Frame Size (mm)
53
Length (mm)
31
Type
Incremental
Format
BISS C
Resolution
2000 - 2,048,000
Frequency Response (MHz)
5
Product Informatiom
Series
S21D
Frame Size (mm)
53
Length (mm)
31
Type
Incremental
Format
Digital
Resolution
1000 - 409,600
Frequency Response (MHz)
0.5
Product Informatiom
Series
S21G
Frame Size (mm)
53
Length (mm)
31
Type
Absolute
Format
Serial, SSI Gray code
Resolution
8 - 16-bit Gray code
Frequency Response (MHz)
0.3
Product Informatiom
Series
S21H
Frame Size (mm)
53
Length (mm)
31
Type
Incremental
Format
Digital, high count
Resolution
8 - 16-bit Gray code2000 - 2,048,000
Frequency Response (MHz)
1.5
Product Informatiom
Series
S21P
Frame Size (mm)
53
Length (mm)
31
Type
Absolute
Format
Parallel, Gray code
Resolution
13-bit Gray code
Frequency Response (MHz)
0.3
Product Informatiom
Series
S21W
Frame Size (mm)
53
Length (mm)
31
Type
Incremental
Format
Digital w/ commutation
Resolution
2048 - 204,800
Frequency Response (MHz)
0.5
Product Informatiom