The optocoupler OC11Ex/2G.2 converts the
PROFIBUS-DP signals on copper cables 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 OC11Ex/3G.2 in zone 2 transmits
the signals via the optical interface to the
OC11Ex/2G.2 in zone 1 which converts them.
The signals are then output intrinsically safe at
the RS485-IS interface.
The RS485-IS interface is entirely realized according to the PNO PROFIBUS guideline. The
optocoupler OC11Ex/2G.2 is equipped with
■ intrinsically safe RS485-IS PROFIBUS interface (acc. to the RS485-IS draft worked
out by the PNO work group)
■ 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 OC11Ex/2G.2 shield is always
capacitively coupled to the equipotential bonding.

■ 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 1 possible
■ Note: Idle level corresponds to active light!