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Allen-Bradley Hardware Product

Multi-turn Magnetic Absolute Encoders

  • Allen‑Bradley Bulletin 842A Multi-turn Magnetic Encoder is a 24-bit absolute multi-turn shaft encoder.
Allen‑Bradley Bulletin 842A Multi-turn Magnetic Encoder is a 24-bit absolute multi-turn shaft encoder.

Our Bulletin 842A Multi-turn Magnetic Encoder is a 24-bit absolute multi-turn shaft encoder. It provides up to 8192 pulses per turn or a maximum of 8192 turns. It uses a technology called Synchronous Serial Interface (SSI) to provide 24-bit resolution over just 5 wires. The SSI output from the 842A encoder can be interfaced in several different ways.

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Bulletin 842A Multi-Turn Magnetic Encoders
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Overview

  • Reduced wiring cost and complexity
  • Noise immunity achieved via differential communication format
  • Simplified startup
  • Choice of gray code or natural binary formats

Typical applications include:

  • Steel mills
  • Overhead cranes
  • Punch press
  • Transfer lines
  • Oil rigs
  • Wind mills
  • Machine tools
  • Packaging

Product Selection

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Documentation

Looking for Technical Documentation?

Visit the Technical Documentation Center to find product specifications, installation guides, user manuals, product certifications and more.

View Multi-turn Magnetic Absolute Encoders Technical Publications and Certifications

Certifications

CE Marked

Certifications apply when product is marked. See our Product Certification site for Declarations of Conformity, certificates and other certification details. 

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