MASI65-M12 User's Manual
V 1.1 19
2.4.3 Voltage drop
System-related limit values regarding system power supply must be strictly observed if maximum func-
tional safety and fault-free operation are to be ensured.
Always ensure that the system voltage, measured at the slave furthest away from
the system power supply, does not drop below 26,5V DC.
A voltage drop, dependent on the load current, results in the system cable as the sensors and actuators
are supplied centrally from the AS-Interface power supply unit.
In critical cases, optimization can be achieved by changing the location of the
system power supply unit within the system layout and by using power supply
cables of a greater conductor cross-section (only for round cables).
AS-Interface modules with digital inputs support the direct connection of commercially available sensors.
The voltage needed to operate the sensors is supplied by a slave internal power supply taken from the
bus.
With the lowest admissible supply voltage at slave level and with regard to voltage drops in the slave,
optimal power supply of sensors is always guaranteed.
The sensor power supplies of different AS-Interface modules supplied by the bus
cable are not grounded and should in no case be coupled !
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