The four-channel multibarrier MBD40-4R/Ex
enables the connection of a large number of
field devices to one fieldbus in the Ex-area,
according to IEC 61158-2.
4 Ex i field devices can be connected to each
multibarrier and 16 Ex i field devices 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 nodes. In order to limit inrush currents at the moment of turn-on, the drop lines/
spurs are switched on one after the other.
Inputs and outputs of the trunk line feature enhanced safety protection (Ex e) and the spurs
to the field devices are intrinsically safe (Ex i).

The multibarrier is equipped with an activatable terminating resistor for the bus. The terminating resistor is switched on/off by means
of a jumper.
Status and error messages of the single spurs
are indicated via LEDs at the front.
The multibarrier can either be mounted on a
DIN rail or in a housing.

■ Galvanically separated Ex e bus cables
and Ex i outputs
■ Temperature range: -40…+75 °C
(-40…+167 °F)
■ Integrated terminating resistor (optional activation)
■ output data: 10V/40mA (short-circuit proof)
■ Entity and FISCO compliant acc. to
60079-27