Phoenix Contact PSR-ESA2/4x1/1x2/B User Manual

Safety of machines and systems
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Figure 2-8 Logical representation of subsystem C (in accordance with EN 62061)
Figure 2-9 Logical representation of subsystem D (in accordance with EN 62061)
For subsystems with integrated diagnostic functions such as safety relay modules and
safety control systems, the achieved PFH
D
and SILCL are provided by the manufacturer.
For subsystems consisting of discrete components (e.g., switches, contactors, etc.), the
PFH
D
value is calculated according to the subsystem type using a specific equation (see
Section 6.7.8.2 of EN 62061). For components that are subject to wear, the failure rate is
determined based on the number of operating cycles using the B10
D
value provided by the
component manufacturer.
λ
Den
λ
De1
Subsystem C
Subsystem
Element n
Subsystem
Element 1
Diagnostic function(s)
λ
De1
λ
De1
λ
De1
λ
De2
Subsystem
Element 1
Diagnostic function(s)
Subsystem
Element 2
Common
cause
failure
Subsystem D

Phoenix Contact PSR-ESA2/4x1/1x2/B Specifications

General

Brand	Phoenix Contact
Model	PSR-ESA2/4x1/1x2/B
Category	Relays
Language	English