Technical details
Operating Manual PIT m4SEU
1004648-EN-02
| 66
No.
Measures against CCF
Score
Confirmed by
1
Physical separation between signal paths, for example:
}
separation in wiring/piping;
}
detection of short circuits and open circuits in cables by dynamic
test;
}
separate shielding for the signal path of each channel;
}
sufficient clearances and creepage distances on printed-circuit
boards.
15
Pilz
3.1
Protection against over-voltage, over-pressure, over-current, over-
temperature, etc.
15
Customer
6.1
For electric/electronic systems, prevention of contamination and
electromagnetic disturbances (EMC) to protect against common
cause failures in accordance with appropriate standards (e.g. IEC
61326-3-1).
Fluidic systems: filtration of the pressure medium, prevention of
dirt intake, drainage of compressed air, e.g. in compliance with
the component manufacturers' requirements concerning purity of
the pressure medium.
NOTE: For combined fluidic and electric systems, both aspects
should be considered.
25
Pilz
6.2
Other influences:
Consideration of the requirements for immunity to all relevant en-
vironmental influences such as, temperature, shock, vibration, hu-
midity (e.g. as specified in relevant standards).
10
Customer
Total
65
Extract from Table F.1 (EN ISO 13849-1)
}
The user must provide the following data:
– The pushbutton must meet Cat. B
– To calculate the MTTF
D
of the pushbutton:
- B
10d
value
- n
op
(average number of operations per year) of the pushbutton
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.
