Rockwell Automation Publication 843ES-UM001A-EN-P - February 2020 19
Safety Concept Chapter 2
• IEC 60204-1, Safety of machinery. Electrical equipment of machines.
General requirements.
The 843ES CIP Safety encoder can be applied using the following GuardLogix
controller-based safety instructions, according to IEC 61800-5-2:
• SS1 – Safe Stop 1
• SS2 – Safe Stop 2
• SOS – Safe Operating Stop
• SLS – Safely-limited Speed
•SDI – Safe Direction
•SLP – Safe-limited Position
Encoders that are used for speed or position monitoring safety functions are
likely used with other safety functions such as: enabling, guard locking, and
guard interlocking. Additional guidance for those safety functions can be found
in the following:
• ISO 12100 Safety of machinery—General principles for design— Risk
assessment and risk reduction
• ISO 13855 Safety of machinery—Positioning of safeguards concerning
the approach speeds of parts of the human body
The type approval, certification, and suitability levels for the 843ES CIP Safety
encoder describe a system with an overall system safety function of SIL 3.
However, you are not required to use 843ES CIP Safety encoders only in safety
applications with an overall system safety function of SIL 3.
For example, a GuardLogix 5580 controller without a 1756-L8SP safety partner
is suitable for use in safety applications that are rated up to, and including, SIL
CL2, PLd, Cat. 3 as defined in IEC 61508, IEC 61511, IEC 62061, and
ISO 13849-1. You can use 843ES CIP Safety encoders in such an application.
GuardLogix 5580 controllers, when used with a 1756-L8SP safety partner are
suitable for use in safety applications that are rated up to, and including SIL 3,
and PLe, cat. 4 as defined in IEC 61508, IEC 61511, IEC 62061, and
ISO 13849-1. You can use 843ES CIP Safety encoders in such an application to
achieve SIL 3 and PLe, Cat. 3.
For more information on the suitability level of Logix 5000™ safety controllers,
see publication 1756-RM012
.
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