Page 7 - Wieland - Safety: Safe system solutions for automation technology

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safety

Risk assessment according to
EN ISO 13849-1
Low risk
As the successor standard to EN 954-1, EN ISO P 1 a
13849-1 is based on the known categories. F 1
S 1 P 2 b
EN ISO 13849-1 deals with the complete safety P 1
F 2 Performance
functions, including all the devices involved in P 2 c Level required
the their design. Starting point P 1 PLr r
for the risk F 1
EN ISO 13849-1 makes a quantitative assessment S 2 P 2 d
P 1
assessment of the safety functions. Using the F 2
categories as a basis, the so-called Performance P 2 e
Levels (PL) are applied for this purpose. High risk

Safety assessment according to Effects and severity Class K = F + W + P
EN/IEC 62061 S 3-4 5-7 8-10 11-13 14-15
In electrical control technology according to Death, loss of an eye 4 SIL 2 SIL 2 SIL 2 SIL 3 SIL 3
or an arm
EN/IEC 62061, safety requirements can be
Permanent, loss of
divided into so-called Safety Integrity Levels fingers 3 AM SIL 1 SIL 2 SIL 3
(SIL). The risk assessment takes into account Reversible, medical 2 AM SIL 1 SIL 2
treatment
the severity of the injury (S), the frequency
Reversible, First Aid 1 AM SIL 1
and duration of the exposure to the hazard (F),
the probability of occurrence of a potentially
hazardous incident (W), and the possibility of
avoiding or limiting the damage (P). Hence, at
the highest protection level SIL 3, the safety
function must be maintained at all times.

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