8
MSI-s
DEUTSCH
E
F
ITALIENI
SPANISCH
2.1.1
Proper use
The Safety Interface Device must only be used after it
has been selected in accordance with the respectively
applicable instructions and relevant standards, rules and
regulations regarding labor protection and occupational
safety, and after it has been installed on the machine,
connected, commissioned, and checked by a competent
person.
• When selecting the Safety Interface Device it must be
ensured that its safety-related capability meets or
exceeds the required performance level PLr ascertai-
ned in the risk assessment.
The following table shows the safety-related characteri-
stic parameters of the MSI-s/R modular Safety Interface
Devices.
Type in accordance with IEC/EN 61496
Type 4
SIL in accordance with IEC 61508
SIL 3
Performance Level (PL) in accordance with ISO 13849-1: 2008 PL e
Category in accordance with ISO 13849-1
Cat. 4
Mean probability of a dangerous failure per hour (PFH
d
) as a
function of the mean number of annual switching cycles of the
relay n
op
*
100% Load n
op
= 4,800:
1.5 x 10
-08
1/h
60% Load
n
op
= 4,800:
1.2 x 10
-08
1/h
100% Load n
op
= 28,800:
3.1
x
10
-08
1/h
60% Load n
op
= 28,800:
1.5
x
10
-08
1/h
100% Load n
op
= 86,400:
7.4
x
10
-08
1/h
60% Load n
op
= 86,400:
2.1
x
10
-08
1/h
*n
op
= mean number of annual actuations, see C.4.2 and C.4.3 of ISO 13849-1: 2008
Use the following formula to calculate the mean number of annual actuations:
In doing so, make the following assumptions with regard to the use of the component:
h
op
= mean operating time in hours per day
d
op
= mean operating time in days per year
t
Zyklus
= mean time between the start of two successive cycles of the component (e.g switching of a valve) in seconds per cycle
n
op
d
op
h
op
3600 s/h
⋅
⋅
(
)
t
Zyklus
÷
=