Rotary encoder detects internal malfunctions
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Pepperl+Fuchs GB product story
Edited by the Engineeringtalk editorial team
Mar 10, 2009
Pepperl and Fuchs has developed a rotary encoder for use in drive applications.
The new design offers easy integration and a simple interface, which is operable without additional wiring, interface cards or safety modules.
The use of existing standard components, functions and accepted communication paths are the key to the new design.
Current solutions employed in encoders with safety ratings achieve the required fail-safe functionality with one of two methods, redundancy (two encoders) or by using a separate external monitoring unit.
Both methods result in an increased unit and implementation cost.
Pepperl and Fuchs has developed an encoder with internal self-checking, compliant to SIL3 with an incremental output based on a standard sine/cosine interface that allows the device to detect and safely communicate internal malfunctions.
This enables machines and control systems to revert to a safe condition (for example safe stop and safe reduced speed) before sequential faults lead to a risk to operating personnel.
The new approach allows encoders to be used with existing communication paths between sensor components and plant-control systems, permitting the application of these rotary encoders in plants with high safety categories up to SIL3 (in accordance with IEC 61508), Performance Level e according to ISO 13849, Safety Category 4 according to EN 954-1 and electrical drives according to IEC 61800-5-2.
The RVS58S is a SIL3 safety related encoder according to IEC 61508-1.
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