Specifications
PHOENIX CONTACT 41
4 SIL 2 SIL 2 SIL 2
SIL 3
SIL 3
3 SIL 1 SIL 2 SIL 3
2
SIL 1
SIL 2
1 SIL 1
PSR-ESM4
A1 S34 S33 S11
S12 S21 S22 A2
32 23
31 13 14
24
K2
K1
Power
1 2 3
5
5
4
3
2
5
4
3
2
1
5
3
1
+
+
04.04.2008 12:56:28 Uhr04.04.2008 12:56:28 Uhr
ement
ated
s
fied danger
EN IEC 62061: 2005
Functional safety of safety-related electrical, electronic and programmable electronic control systems (CE/E/PES)
A reduction in the risk posed by the danger is carried out in three steps:
Constructive
measures
Technical
protective
measures
User
information
Detailed information can be found in the EN 1050 standard and in future, in the EN ISO 14121 standard
The way to a
safe machine or
system
a) Determining the required capacity
Effects
Death, loss of an eye
or arm
Permanent, loss of
fingers
Reversible, medical
treatment
Reversible, first aid
Other measures
Severe S
Determination of the necessary SIL
Class 3 – 4
Class 5 – 7
Class
8-10
Class
11 - 13
Class
14 - 15
b) Design of the control system architecture and determining the capacity
attained
The safety-related parameter for part
systems comes from the following values
specified by the manufacturer for certified
devices:
• SIL CL (SIL demand limit; SIL Claim Limit)
•PFH
D (probability of dangerous failures)
• T1 (duration of use)
The part systems can consist of differently
connected devices for which the following
parameters must be specified, in order to be
able to record the appropriate PFH
D
value of
the part system:
•
∑ λ (Lambda, failure rate)
• SFF (Safe Failure Fraction)
Architecture of the safety function
(SRP/CS, SRECS)
F
Frequency and durationFrequency and duration
≤
1 hour
> 1 hour to ≤ 1 day
> 1 day to ≤ 2 weeks
> 2 weeks to ≤ 1 year
> 1 year
W
Probability of a dangerous
incident
Frequent
Probable
Possible
Seldom
Negligible
P
Avoidance
Impossible
Possible
Probable
The standards are
presented in an extremely
simple manner for better
understanding.
elated control system
function
fulfills the appropriate requirement. Tests, for example, are conducted and
documented for this purpose.