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Festo — CPX-F8DE-P — 2022-10d
System overview CPX-F8DE-P
Functional safety for both examples
–
PL c, Cat. 1/SIL 1
with switch/sensor tried and tested in accordance with EN 13849-2, Table D.3
–
to PL c, Cat. 3/SIL 2
with certified switch/sensor of an appropriate safety classification
and with wiring protection of the customer application according to EN 13849-2, Table D.4,
and with testing of the safety application once a year
–
up to PL e, Cat. 3/SIL 3
with certified sensor of an appropriate safety classification
and with wiring monitoring by the connected sensor (example B).
2.3.3.5
Function mode 4 – 1oo1 D (antivalent)
Signal evaluation of up to two independent dual-channel switches/sensors (internally antivalent, N/O
or N/C) or up to four operationally tested switches per channel pair. The clock signals at E1, E3, E5 and
E7 are wired as a mirror image of E0, E2, E4, E6.
Fig. 9: Function mode 4 – 1oo1 D
This function mode tests the switch function and wiring of the sensors.
• Use only sensors with antivalent outputs in which the one contact opens before the other contact
closes.
• Ensure that the N/O and/or N/C switches of sensors are connected with the appropriate clock
signal connections for the channel pair
è
circuit diagram.
• Note that before every actuation a zero crossover is required (normally closed contact of the N/C
switch closed).
