Festo CPV GE-ASI-8E8A-Z M8 Serie Instructions D'utilisation page 26

3.6 Connect the AS−Interface bus and the load voltage
Please note
The sensor supply for the inputs is provided via the
AS−Interface bus.
The valves must be supplied separately with 24 V via
the load voltage connection.
The AS−Interface has an integrated watchdog function
which resets the outputs if the bus communication
fails.
Warning
Use only power units which guarantee reliable electrical
isolation of the voltage supplies in accordance with
IEC 742/EN 60742/VDE 0551 with at least 4 kV isola
tion resistance (Protected Extra Low Voltage PELV).
Switch power packs are permitted, providing they guar
antee reliable isolation in accordance with EN 60950/
VDE 0805.
Note:
By the use of PELV power units, protection against electric
shock (protection against direct and indirect contact) is
guaranteed with the SPC10 in accordance with EN 60204−1/
IEC 204. Safety transformers with the adjacent symbol
must be used for supplying PELV networks. The valve ter
minal must be earthed ensure that it functions correctly
(e.g. EMC).
26 Festo CPV..−GE−ASI−8E8A−Z M8 0306c English