Drehmo i-matic Installations- und Betriebshandbuch - Seite 17

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Supplement operating manual for DREHMO i-Matic actuators with integrated

MODBUS fieldbus interface

2.5.2.2

Connection with fibre optic cable

Devices of category 2 G/D for explosive areas have the connection solely by rail mounted screw terminals.

The fibre optic converter

inside the extended safety compartment is powered by the electronic unit. The

converter is pressure proof sealed, and the optical interface is intrinsically safe. Actuators can be fitted with

single line fibre optic interfaces (e.g. line or star structure), or with a redundant fibre optic interface for a ring

structure. The breakout has to be put inside the compartment. It is therefore important to keep the size of the

breakout small enough to be able to push it through a cable gland of the size M20. The standard connector is

of type F-SMA. The following pictures show the inside of the wiring compartment.

- Connection with fibre optic interface – terminals - Connection with fibre optic interface – fibre optic cable

2.5.2.2.1

Setting of transmission power

The converter board has two switches S1 and S2. The switches can be used to set the transmission power

according to the requirements of the input and output independently. If the adjacent devices are only a short

distance apart, the appropriate switch should be switched to „-" (default setting). If the transmission power is

not sufficient to cover the distance between two devices, the switch can be set to position „+".

The two LEDs on the board show whether the power supply is OK (green LED), and whether data are

transferred via the optical PROFIBUS (yellow LED).

Wenden, 21.03.12

Page 17 of 18

Prepared by: Ste