Safety Categories In Accordance With En Iso 13849-1:2015 (Safety Of Machinery - Safety-Related Parts Of Control Systems - Part 1: General Design Principles) - B&R Mobile Panel 40 User Manual

Standards and certifications
5.4.3 Safety categories in accordance with
related parts of control
Safety category (per EN
13849-1:2015)
B
1
2
3
4
The following risk graph (per
Starting point for the
risk assessment of
the safety-related
part of the controller
94
systems - Part 1: General design principles)
Short description
SRP/CS and/or their protective equipment, as well as their com-
ponents, shall be designed, constructed, selected, assembled and
combined in accordance with relevant standards so that they
withstand the expected influence. Basic
used.
Requirements of B shall apply. Well-tried components and well-
tried safety principles shall be used.
Requirements of B and the use of well-tried
apply.
Safety function shall be checked at suitable intervals by the
chine control system.
Requirements of B and the use of well-tried
apply. Safety-related parts shall be designed so that:
•
A single fault in any of these parts does not lead to the
loss of the safety function.
• Whenever reasonably practicable, the single fault is de-
tected.
Requirements of B and the use of well-tried
apply. Safety-related parts shall be designed so that:
•
A single fault in any of these parts does not lead to the
loss of the safety function.
• The single fault is detected at or before the next demand
upon the safety function. If this detection is not possible,
an accumulation of undetected faults is not permitted to
lead to the loss of the
Table 47: Overview of
EN 13849-1:2015, annex A) provides a simplified procedure for risk assessment:
Figure 64: Risk graph for determining the PLr for each
EN ISO 13849-1:2015
can
safety principles shall be
safety principles shall
ma-
safety principles shall
safety principles shall
safety function.
safety categories
(Safety of machinery - Safety-
System behavior
Caution!
The occurrence of a fault can
of the safety function.
Caution!
The occurrence of a fault can
of the safety function but the probability of
occurrence is lower than for category B.
Caution!
The occurrence of a fault can
of the safety function between the checks.
The loss of safety function is detected by the
check.
Caution!
When a single fault occurs, the
tion is always performed.
Some but not all faults will be detected.
Accumulation of undetected faults
to the loss of the safety function.
Information:
When a single fault occurs, the
tion is always performed.
Detection of accumulated faults reduces the
probability of the loss of the
(high DC).
The faults will be detected in time to prevent
the loss of the safety function.
safety function
Mobile Panel 40/50 User's manual V1.80
lead to the loss
lead to the loss
lead to the loss
safety func-
can lead
safety func-
safety function