Pilz PZE X4V 8/24VDC 4n/o - Manual (Page 13)

PZE X4V8
Operating Manual PZE X4V8
1003204­EN­05 13
Safety characteristic data
Operating
mode EN ISO
13849­1:
2008
PL
EN ISO
13849­1:
2008
Category
EN IEC
62061
SIL CL
EN IEC
62061
PFH
D
[1/h]
IEC 61511
SIL
IEC 61511
PFD
EN ISO
13849­1:
2008
T
M
[year]
Safety con­
tacts,
delayed <30
s
PL d Cat. 3 SIL CL 2 2,48E­09 SIL 2 1,47E­05 20
All the units used within a safety function must be considered when calculating the safety
characteristic data.
INFORMATION
A safety function's SIL/PL values are not identical to the SIL/PL values of
the units that are used and may be different. We recommend that you use
the PAScal software tool to calculate the safety function's SIL/PL values.
Supplementary data
CAUTION!
It is essential to consider the relay's service life graphs. The relay outputs'
safety­related characteristic data is only valid if the values in the service life
graphs are met.
The PFH value depends on the switching frequency and the load on the relay output. If the
service life graphs are not accessible, the stated PFH value can be used irrespective of the
switching frequency and the load, as the PFH value already considers the relay's B10d
value as well as the failure rates of the other components.
Service life graph
The service life graphs indicate the number of cycles from which failures due to wear must
be expected. The wear is mainly caused by the electrical load; the mechanical load is negli­
gible.