WEG CPW17, Руководство пользователя

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General Information
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2.4 TERMS AND DEFINITIONS
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CPW17
Emergency Stop Safety Relay from WEG Company.
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PLMP
Standard screw fixing adapter from WEG Company.
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CAT
Category: Classification of the safety-related parts of a control system in respect of their resistance to faults and
their subsequent behavior in the fault condition, and which is achieved by the structural arrangement of the parts,
fault detection and/or by their reliability.
[EN ISO 13849-1:2015]
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PL
Performance Level: Discrete level used to specify the ability of safety-related parts of control systems to perform
a safety function under foreseeable conditions.
[EN ISO 13849-1:2015]
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SIL
Safety Integrity Level: Discrete level for specifying the safety integrity requirements of the safety functions, where
safety integrity level 4 has the highest level of safety integrity and safety integrity level 1 has the lowest.
[IEC 61508:2010]
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PFD
Probability of Dangerous Failure Demand: Safety unavailability of safety-related system to perform the specified
safety function when a demand occurs from the control system.
[IEC 61508:2010]
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SFF
Safe Failure Fraction: Property of a safety related element that is defined by the ratio of the average failure rates
of safe plus dangerous detected failures and safe plus dangerous failures.
[IEC 61508:2010]
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SIL CL
SIL Claim Limit: Maximum SIL that can be claimed for a safety related electrical control system in relation to
architectural constraints and systematic safety integrity.
[IEC 62061:2005]
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PFHd
Probability of dangerous Failure per Hour: Average probability of dangerous failure within 1 h.
[IEC 62061:2005]