12 Rockwell Automation Publication 843ES-UM001A-EN-P - February 2020
Chapter 1 Product Overview
Single-turn vs. Multi-turn Encoders
Absolute encoders are either single-turn or multi-turn. Single-turn encoders are
used if the absolute position of the shaft for one revolution is required. Multiturn
encoders are used if the absolute position is required for multiple shaft
revolutions. Compared to single-turn encoders, multi-turn encoders feature an
additional gear to allow measuring absolute positions larger than 360°.
Operating Principle of the
Encoder
The 843ES CIP Safety encoder acquires the position of rotating axes and outputs
the position in the form of a unique digital numeric value. Optical acquisition of
the rotary position value is from an internal coded disk.
Intended Use
The 843ES CIP Safety encoder can be used as a rotation angle, position, or speed
sensor. It supports functions that are based on speed and rotation direction
information (for example, in industrial processes or controls).
As a sensor, the 843ES CIP Safety encoder supports safety functions regarding
speed and rotation direction. It is not able to achieve a safe state in the safety
function on its own.
A superordinate evaluation device must detect rotational speed, rotation
direction, and standstill, as well as failures that may represent a danger.
The 843ES CIP Safety encoder and the encoder evaluation device must meet the
requirements that are stated in Specifications
on page 79.
Foreseeable Misuse
The encoder is not suitable for the following uses:
•Underwater
• In publicly accessible areas
• Outside of the specifications stated in Specifications
on page 79.
• Areas where more serious EMC events may occur than those areas defined
in IEC 61326-1.
Scalable Resolution
The steps per revolution can be scaled in integers from 1…262,144 for the
standard connection, and 1…32,768 for the safety connection. The total
resolution of the 843ES CIP Safety multi-turn encoder must be 2n times the
steps per revolution.
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