The eight-channel multibarrier MBD40-8R/Ex

enables the connection of a large number of

field devices to one fieldbus in the Ex-area,

according to IEC 61158-2.

8 Ex i field devices can be connected to each

multibarrier and 32 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. The

field devices can be supplied with maximally 40 mA. Each spur is short circuit protected

through 50 mA current limitation. Altogether,

160 mA are maximally available for nominal

operation and splittable onto the connected

field devices as follows:

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