The optocoupler OC11Ex/3G.2 converts the

PROFIBUS-DP signals into optical signals.

The bus signals can therefore be transmitted

from the safe area to the Ex area over long

distances without potential or interference.

When using fiber-optic cables, the maximum

baud range is 2500 m for OM1 (62.5/125-µm)

cables and 1500 m for OM2 (50/125-µm) cables.

The optocoupler can be installed in the nonEx area or in zone 2. The OC11Ex/3G.2 receives the PROFIBUS-DP signals at its standard interface RS485 and transmits them via

the intrinsically safe optical interface to the optocoupler OC11Ex/2G.2 in zone 1.

The optocoupler OC11Ex/3G.2 is equipped

with

■ RS485 interface – standard PROFIBUSDP interface with RS485 level acc. to EIA

485 (the control cable for direction control

is not connected)

■ intrinsically safe optical interface with ST

connectors for emitter and receiver

Up to 31 bus nodes can be connected to the

fiber-optic coupler. Baud rates of 9.6 kbps up

to 1.5 Mbps are possible or will be automatically detected.

For diagnostic purposes there are four status

LEDs that indicate power ON, fiber-optic segment, RS485 interface and baud rate. The device features an M8 communication interface.

Two OC11Ex devices can be coupled together via the M8 interface. Wire-break and shortcircuit are not transmitted from one segment

to the next one. All segments can thus be operated trouble-free and independently of one

another.

In order not to limit the number of nodes and

cable length of a PROFIBUS-DP segment,

amplitude and phase are reproduced in the

coupler. The user can choose between capacitive and direct earthing.

■ Device for data transmission between electrical and optical fieldbus circuits

■ Power supply of max. 31 nodes

■ OM1 (62.5/125) for transmitting data over

distances up to 2500 m

■ OM2 (50/125) for transmitting data over

distances up to 1500 m

■ Mounting in zone 2 allowed

■ Note: Idle level corresponds to active light!