Selecting The Performance Level And Category Per En Iso 13849-1 - B&R Mobile Panel 40 User Manual

Standards and certifications
Ausgangspunkt für die
Risikoabschätzung des
sicherheitsbezogenen
Teils der Steuerung
B, 1 bis 4
The safety category to be used is determined by starting at the specified starting point and taking the parameters
S, F and P into consideration.
S1
S2
F1
F2
P1
P2
Table 50: Parameters S, F and P lead you to the
5.4.5 Selecting the performance level and category per
The machinery directive
control loop itself – is not permitted to result in a dangerous situation. This general approach is standardized in
EN ISO 13849-1 "Safety-related parts of
related control systems. The PL depends on the category, the MTTF
circuit. The CCF examination must also be performed.
As in the earlier EN 954-1 standard, the category describes the structure of the
the performance level (PL), which describes the
The PL is selected by the
mined by the danger and risk assessment. At a minimum, PL d is normally required for dangers that
in irreversible injury or death.
The category specified with the PL provides information about the following:
• Whether the system is designed as a 1-channel system, in which case a fault could lead to a loss of the
safety function but component
• Whether the system is designed as a 1-channel system, in which case a fault could lead to a loss of the
safety function but the fault is detected by the system and indicated in one form or another (category 2)
• Whether the system is designed as a 2-channel system and a fault will not lead to a loss of the
function (category 3)
• Whether the system is designed as a 2-channel system and an accumulation of faults will not lead to a
loss of the safety
96
Sicherheitskategorien für sicherheitsbezogene Teile von Steuerungen
Bevorzugte Kategorien
Mögliche Kategorien, die zusätzliche Maßnahmen erfordern
Maßnahmen, die in Bezug auf das zutreffende Risiko überdimensioniert sein können
Figure 65: Risk graph per
Parameter S ... Severity of injury
Slight (normally reversible injury).
Severe (usually irreversible) injury.
Parameter F ... Frequency and/or exposure to hazard
Seldom to slightly more frequent and/or short exposure duration.
Frequent to continuous and/or long exposure duration.
Parameter P ... Possibility of preventing danger
Possible under specific conditions.
Scarcely possible.
dictates that a defect in the logic of the
control systems", which defines performance levels (PL a to e) for safety-
safety
machine manufacturer according to the actual potential for hazardous situations deter-
availability
function (category 4)
Safety integrity level - SIL
(gemäß IEC 61508-2)
EN 954-1, annex B
safety category to be used
EN ISO
control loop – or disturbance or damage to the
value and the DC of the corresponding
d
function's probability of
is high (category 1)
Sicherheitskategorie
(gemäß EN 954-1)
13849-1
safety functions. What is new is
failure and ability to detect faults.
Mobile Panel 40/50 User's manual V1.80
safety
can result
safety