Festo ASI−EVA 2E2A−Z Série Manuel D'installation page 22

3.6 Connecting the AS−Interface bus and the load voltage
Please note
The power supply for the sensors is provided via the
AS−Interface bus.
The outputs can only be supplied with power via the
AS−Interface if the DIL switch is configured appropri
ately.
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
guarantee reliable isolation in accordance with
EN 60950/VDE 0805.
By using PELV power units, you can ensure protection
against electric shock (protection against direct and in
direct contact) in accordance with EN 60204−1/IEC 204. For
supplying power to PELV networks, you should use safety
transformers with the symbol shown here. The valve ter
minal must be earthed in order to guarantee the operation
of certain functions (e.g. EMC).
Recommendation: Use the Festo AS−Interface combi power
unit type ASI−CNT−115/230VAC−B.
22 Festo ASI−EVA−...−2E..A−Z 0401b English