The four-channel MBD40-T0415/EX/000 multibarrier
enables the connection of a large number of field devices to one
Profibus PA fieldbus in the Ex area, according to IEC 61158-2. Each
4 channel multibarrier can take four Ex i field devices.
Up to 16 Ex i field devices can be connected to
the bus. Ex e fieldbus supply (High Power Trunk Concept), which is
looped through from multibarrier to multibarrier, allows to augment
the number of subscribers. In order to limit inrush currents at the
moment of turn-on, the drop lines/spurs are switched on one after
Inputs and outputs of the trunk line feature
increased safety protection (Ex e) and the spurs to the field
devices are intrinsically safe (Ex i). The Ex e bus cables and the
Ex i outputs are galvanically separated. The field devices can
be supplied with a maximum of 40 mA. Each spur is short-circuit
protected through 50 mA current limitation. Altogether, a maximum of
160 mA is available for nominal operation.
Integrated terminating resistors can be activated
optionally. The enclosure is die-cast aluminium, powder paint coated
with pressure compensation element for condensation protection and
has an external M5 bolt for earthing.