Festo VMPA-ASI Serie Mode D'emploi page 26

3.6 Connect the AS-Interface bus and the load voltage
The sensor supply for the inputs is provided via the
AS-Interface bus.
Warning
Use only power sources which guarantee a secure
electrical isolation of the operating voltage as per
IEC/DIN EN 60204-1.
Observe also the general requirements for PELV power
circuits as per IEC/DIN EN 60204-1.
Note
The sensor supply gained from the AS-interface
power supply is protected from short circuits and
overload. It must not be connected to other potentials
(for example, common ground).
The valves (outputs) are always supplied with 24 V
additional supply, separate via the load voltage
connection.
Please note with branch lines:
– the maximum total length of the AS-Interface bus:
(100 m without repeaters/extenders)
– the length of the load voltage connection cable
(depends on the current consumption of the valve
terminal and fluctuations in load voltage)
26 Festo VMPA-ASI-EPL-...-8E8A-Z/-CE 1104b English