Rockwell Automation Publication 843ES-UM001A-EN-P - February 2020 17
Chapter 2
Safety Concept
Introduction
This section introduces you to the functional safety specifications and how the
843ES CIP Safety encoder meets those requirements.
The 843ES CIP Safety encoder supports controller-based safety functions that
are based on the speed and rotation direction information. The internal
diagnostics do not allow the encoder to trigger on its own actions such as
initiating a safe state. Therefore, the 843ES CIP Safety encoder is considered an
input device, which a safety logic controller monitors as part of the overall safety
system. The 843ES CIP Safety encoder is considered a component in the sensor
subsystem (see Figure 1
).
Figure 1 - Example Functional Safety Chain
Safety Certification
TÜV Rheinland has certified the Bulletin 843ES CIP Safety Encoder for use in
safety applications up to and including Performance Level e (PLe) and Category
3 in compliance with ISO 13849-1, and up to and including System Integrity
Level (SIL) CL 3 per IEC 61508, IEC 61800-5-2, and IEC 62061, for
integration in safety-related functions regarding rotational speed, direction, and
position.
The encoder must be installed in accordance with the applicable regulation and
standards.
For product certifications currently available from Rockwell Automation, see the
Product Certifications website link in Additional Resources
on page 9.
Input
Subsystem
(Sensors)
Output
Subsystem
(Sensors)
Logic Solving
Subsystem
Subsystem
Elements
LogicInput
Guard Input
Device
GuardLogix
IMPORTANT Requirements are based on the standards current at the time of certification.
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