Hirschmann OZD Profi 12M G12-EEC Fieldbus Repeater

Hirschmann OZD Profi 12M G12-EEC Fieldbus Repeater

The Hirschmann OZD Profi 12M G12-EEC (Belden Part Number: 943 905-321) is a premium, ruggedized optical fiber converter designed to convert electrical PROFIBUS-DP fieldbus signals into optical signals. Built to withstand “Extended Environmental Conditions” (EEC), this interface provides highly reliable, long-distance fieldbus communications in the most physically punishing industrial sectors.

Product Introduction / Overview

In complex industrial sites—such as outdoor petrochemical refineries, heavy rolling mills, and water treatment plants—standard copper PROFIBUS cables are highly vulnerable to electromagnetic interference (EMI) and are strictly limited by physical distance boundaries.

The OZD Profi 12M G12-EEC bypasses these limitations entirely. Acting as an active signal converter and line repeater, it features 1 electrical DB9 port (RS-485) and 2 optical channels (BFOC/ST ports) supporting multi-mode fiber runs. This allows engineers to build redundant optical ring, star, or line topologies extending up to 3.000 meters per segment. The “EEC” designation guarantees the unit is chemically hardened and thermal-stabilized to prevent transmission drift in unconditioned environments.

Technical Parameter List

Product Features / Core Advantages

Chemical & Extreme Temperature Tolerance (EEC): Featuring coated internal PCBs and heavy housing seals, the unit operates continuously in temperatures ranging from $-40^\circ\text{C}$ to $+70^\circ\text{C}$.

Zero-Downtime Ring Redundancy: By utilizing both Channel 2 and Channel 3 optical ports, the module can construct a closed fiber ring. If a fiber line is physically severed, the module instantly reroutes data pathways to keep communication flowing without interrupting the host master PLC.

Plug-and-Play Baud Rate Tuning: The device automatically detects and locks onto the active PROFIBUS speed (up to 12 Mbps), requiring zero configuration software or manually dialed dip-switch tuning.

Real-Time Signal Intensity Monitoring: Offers an analog voltage output terminal. A technician can hook up a standard multimeter to read the optical path quality in real time, simplifying predictive maintenance.

Model Classification (The OZD Profi Series)

The code layout specifies the following structural details:

OZD Profi 12M G12 – EEC

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[1] [2] [3] [4] [5]

[1] OZD: Optical Zugriffs-Dezcentral (Optical Access Unit identifier).

[2] Profi: Tailored for PROFIBUS networks (RS-485 protocols).

[3] 12M: Supports high-speed transmissions up to 12 Megabits per second (12M).

[4] G12: Glass fiber interface with 1 electrical port and 2 optical channels.

[5] EEC: Extended Environmental Conditions (Standard versions run $-20^\circ\text{C}$ to $+60^\circ\text{C}$).

Environmental Tolerance Conditions

Operating Temperature: $-40^\circ\text{C}$ to $+70^\circ\text{C}$ ($-40^\circ\text{F}$ to $158^\circ\text{F}$)

Storage Temperature: $-40^\circ\text{C}$ to $+80^\circ\text{C}$

Relative Humidity: 10% to 95% (completely non-condensing, circuit boards protected with protective lacquer coating)

Ingress Protection: IP40 (rugged metal chassis)

Approvals: CE, FCC, cUL508. ATEX Zone 2 / Class I Div 2 (certified for hazardous environments containing volatile gases)

Installation Method

[DIN Rail Hanger Clip]

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====|==== <– Place top slot over rail lip

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[ OZD ]

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====|==== <– Slide down and snap bottom metal clip

DIN Rail Placement: Hang the upper notch of the built-in metal DIN-rail attachment on the back of the OZD Profi housing over the top edge of a standard 35mm DIN rail.

Locking Down: Pull the module downward slightly and push the bottom of the housing toward the rail. The heavy-duty bottom metal spring slider will snap shut over the bottom rail lip.

PE Safety Grounding: Securely connect the ground terminal screw on the bottom front face of the module to your cabinet’s primary grounding bus using low-impedance copper wire.

Operating Instructions

1. Dip-Switch Selection (Front Panel)

Configure the 8-pole sliding DIP switch block on the front face prior to powering up:

Switch 1 to 5 (Topology): Set to specify whether the module is configured as a Line Terminal, Star Coupler, or a node within a redundant Optical Ring.

Switch 6 & 7 (Optical Tx Power): Adjusts transmission strength depending on the physical length of your fiber segment (boosts signal for long distances, reduces power for runs under 100 meters to prevent optical receiver saturation).

Switch 8 (Compatibility): Adjusts signaling parameters when integrating with older generations of Hirschmann OZD modules.

2. Cabling up the Interfaces

PROFIBUS RS-485 Connection: Plug your standard Sub-D 9-pin bus connector into the electrical port (CH1). Tighten the connector screws securely.

Optical Fibers: Remove the protective plastic caps from the BFOC/ST ports. Connect the incoming fiber lines to the Rx (receiver) and Tx (transmitter) ports. Cross-wiring is required (Local Tx connects to Remote Rx).

Analog Measurement: Insert your multimeter probes into the direct measurement test sockets on the front panel to verify that the optical receiving voltage is within the healthy zone ($>1.5\ \text{V}$).