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excom I/O System

PROFIBUS-DP fiber-optic coupler for zone 1

OC11EX/2G.2

The optocoupler OC11Ex/2G.2 converts the

PROFIBUS-DP signals on copper cables in-

to optical signals. The bus signals can there-

fore 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 ac-

cording to the PNO PROFIBUS guideline. The

optocoupler OC11Ex/2G.2 is equipped with

■ intrinsically safe RS485-IS PROFIBUS in-

terface (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 automati-

cally detected.

For diagnostic purposes there are four status

LEDs that indicate power ON, fiber-optic seg-

ment, RS485 interface and baud rate. The de-

vice features an M8 communication interface.

Two OC11Ex devices can be coupled togeth-

er via the M8 interface. Wire-break and short-

circuit are not transmitted from one segment

to the next one. All segments can thus be op-

erated 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 bond-

ing.

■ Device for data transmission between elec-

trical 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!