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Category B or 1
Category 2
Category 3
Category 4
Overview of control architectures
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Fundamental safety principles must be fulfilled
(DIN EN ISO 13849-1 Pt. 6.2.3/DIN EN ISO 13849-2 Tab. A 1/B.1/D.1)
Suitable design for external influences
(DIN EN ISO 13849-1 Pt. 6.2.3)
SRP/CS: proven safety principles must be fulfilled
(DIN EN ISO 13849-2 B.4; refer to DIN EN ISO 13849-2 Tab. A.2/B.2/D.2)
1 channel
0 Fault safety
(DIN EN ISO
13849-1 Pt. 6.2.3)
Category B
1 channel
100x test of the
function before the
request by the
machine controller
(DIN EN ISO
13849-1 Pt. 6.2.5)
0 Fault safety
between the test
phases
Category 2
2 channels
(DIN EN ISO
13849-1 Pt. 6.2.7)
Some, but not all
faults are detected
before or during the
next request
1 Fault safety
Multiple undetected
faults lead to the loss
of SF
Category 3
2 channels
(refer to DIN EN ISO
13849-1 Pt. 6.2.7)
Every fault must be
detected before or
during the next
request
> 1 fault safety
Category 4
1 channel
SPR/CS components
(DIN EN ISO 13849-2 A.4/B.4/D.4)
0 fault safety
(DIN EN ISO 13849-1 Pt. 6.2.4)
Category 1
Compliance with
fundamental and
proven safety
principles
Compliance with
appropriate standards
Components proven
in operation.
Already used in
similar applications
(refer to DIN EN ISO
13849-2 B.4)