18 Rockwell Automation Publication 843ES-UM001A-EN-P - February 2020
Chapter 2 Safety Concept
Determine Conformity
The installed system, including the safety control system and the means by which
the machine stops, must achieve the needed safety performance. The encoder is
one element in the safety system.
Before safety components are used, a risk assessment must be performed on the
machine in accordance with:
• ISO 12100, Safety of machinery – Basic concepts - General principles for
design - Risk assessment and risk reduction.
• ISO 13849-1, Safety of machinery. Safety-related parts of control systems.
General principles for design, Annex B
• IEC 62061, Safety of Machinery – Functional safety of safety-related
electrical, electronic, and programmable electronic control systems.
Correct use includes compliance with the relevant requirements for installation
and operation, in particular:
• ISO 13849-1, Safety of machinery. Safety-related parts of control systems.
General principles for design
IMPORTANT Functional safety certification and performance of the 843ES CIP Safety
encoder requires that the encoder operates in conditions at or below the
ambient operating temperature specification.
The probability of a dangerous failure on demand (PFD) and average frequency
of a dangerous failure per hour (PFH) calculations for these modules are based
on the module operating conditions adhering to the ambient operating
temperature specification.
For more information on the maximum ambient operating temperature
specification, see Specifications
on page 79.
ATTENTION: Use only appropriate components or devices that comply with the
relevant safety standards and meet the required safety integrity level or
Performance Level and safety category.
• Conformity to the requirements of the relevant safety standards must be
determined for the entire system by conducting a risk assessment.
• Use devices properly according to the installation environment, performance
rating, and functions of the machine.
• Use devices within their specified ratings.
• We recommend that you consult a certification body regarding assessment of
conformity to the required safety integrity level or Performance Level.
You are responsible for confirming compliance with the applicable standards for
the entire system. You must read, understand, and fulfill the functional safety
requirements of the standard applicable to your safety application.
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