Festo CPV..-GE-ASI-4E4A-... 0112c English
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3.4 Connecting the AS-interface bus and the load voltage
Please note
The sensor power supply for the inputs is provided via
the AS-interface bus. Voltage suppply of the outputs
via the AS-Interface bus is only possible with type
CPV...-GE-ASI-4E4A.Type CPV...-...-Z must always be
supplied with 24 V via the load voltage connection.
The AS-Interface has an integrated watchdog function
which resets the outputs if there is a bus communica-
tion failure.
Warning
Use only power units which guarantee reliable isolation
of the operating voltages as per IEC 742/EN 60742/
VDE 0551 with at least 4 kV isolation resistance (Pro-
tected Extra Low Voltage PELV). Switch power packs are
permitted, providing they guarantee reliable isolation
in accordance with EN 60950/VDE 0805.
Please note
By the use of PELV power units, protection against electric
shock (protection against direct and indirect contact) is
guaranteed in accordance with EN 60204-1/IEC 204.
Safety transformers with the adjacent symbol must be
used for supplying PELV networks. The valve terminals
must be earthed to ensure that they function correctly
(e.g. EMC).
