Festo VMPA-ASI-EPL 4E4A-Z Series Brief Description page 26

3.7 Connect the AS-Interface bus and the load voltage
The sensor supply for the inputs is provided via the
AS-Interface bus.
Warning
S Use only PELV (protective extra-low voltage) circuits
as per EN 60204-1 for the electric power supply.
S Also observe the general requirements for PELV
power circuits as per EN 60204-1.
S Only use power sources which guarantee reliable
electrical isolation of the operating voltage as per
EN 60204-1.
Through the use of PELV circuits, protection against elec-
tric shock (protection against direct and indirect contact)
is guaranteed in accordance with EN 60204-1.
Note
The power supply for the valves (outputs) depends on
the DIL switch setting:
– with 24 V additional supply, separate via the load
voltage connection.
– without additional supply via the AS-interface bus.
Only possible if the maximum current consumption
is not exceeded. The sensor supply gained from the
AS-interface power supply is protected against short
circuits and overload. It must not be connected with
other potentials (example, common ground).
26 Festo P.BE-K-MPA-ASI-4E4A-Z 1109b English