Rockwell Automation Publication 843ES-UM001A-EN-P - February 2020 11
Chapter 1
Product Overview
Encoders electronically monitor the position of a rotating shaft to measure
information such as speed, position, and acceleration.
Features
The features of the 843ES CIP Safety encoder over EtherNet/IP include:
• PLe capable according to ISO 13849-1 and 13849-2, and SIL 3 capable
according to IEC 61800-5-2, IEC 62061, and IEC 61508
• Compatibility with star, linear, and Device Level Ring topology
• Configurable resolution per revolution: 1…32,768 for the safety
connection and 1…262,144 for the standard connection
• Solid shaft with clamping, synchro, and square flanges available
• Safety-related communication performed via CIP Safety connections over
EtherNet/IP
• Blind-hollow shaft available with stator coupling
• 15-bit single-turn resolution for safety connection, 18-bit single-turn
resolution for standard connection
• 12-bit multi-turn resolution + single-turn resolution
•ControlFLASH update compatible
• Add-on Profile for configuration in Studio 5000 Logix Designer®
Encoder Overview
The 843ES CIP Safety encoder is an absolute encoder. An absolute encoder has a
unique digital output for each shaft position. The use of absolute encoders
verifies that true position is always available, regardless of power interruptions to
the system. Absolute encoders can be single-turn or multi-turn.
Multi-turn units assign a unique digital output for each shaft position across
multiple shaft rotations and have high-resolution capability. Applications include
steel mills, overhead cranes, punch presses, transfer lines, oil rigs, wind mills,
machine tools, and packaging.
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