Hirschmann OZD PROFI 12M G12 PRO

Technical Dossier

Product Details And Specifications

Hirschmann OZD PROFI Series: Comprehensive Module Range and Technical Overview

The Hirschmann OZD PROFI series represents a class of fiber optic repeaters and interface converters engineered for PROFIBUS DP/FMS network infrastructure in heavy industrial environments. Deployed extensively in chemical processing plants, nuclear power facilities, petroleum refineries, and large-scale manufacturing automation, the OZD PROFI line provides electrical isolation and optical signal conversion between copper-based PROFIBUS segments and fiber optic transmission media. The series supports data rates up to 12 Mbit/s and is designed to operate in environments with high electromagnetic interference (EMI), ground potential differences, and extended cable runs where copper transmission is not viable. The OZD PROFI 12M G12 PRO specifically supports 12 Mbit/s PROFIBUS DP/FMS with 12 fiber optic ports, making it a hub-class device for star topology fiber networks. Its installed base spans legacy DCS architectures from Siemens, ABB, Honeywell, and Yokogawa, where it remains a critical infrastructure component.

The Evolution of OZD PROFI Architecture

The OZD PROFI product line was developed by Hirschmann Automation and Control GmbH (a Belden brand) to address the limitations of copper-based PROFIBUS in industrial field environments. Early iterations of the series — including the OZD PROFI 12M G4 and G8 variants — provided 4-port and 8-port fiber optic star couplers operating at up to 12 Mbit/s. These devices used ST-type fiber connectors and supported both multimode (62.5/125 µm) and singlemode fiber configurations depending on the variant suffix.

As PROFIBUS networks scaled in complexity through the 1990s and 2000s, Hirschmann introduced the G12 and G12 PRO variants with expanded port counts and enhanced diagnostics. The PRO suffix denotes extended functionality including integrated bus monitoring, segment fault isolation, and LED-based port status indication — features critical for maintenance teams managing large distributed control systems. The OZD PROFI 12M G12 PRO operates at the full PROFIBUS DP maximum baud rate of 12 Mbit/s and supports redundant ring topologies when paired with compatible OZD PROFI modules.

With the broader industry transition toward Industrial Ethernet (PROFINET, EtherNet/IP), the OZD PROFI series has entered a mature/end-of-life phase. Hirschmann has discontinued active production of several variants. However, the installed base in brownfield facilities remains substantial, and replacement units are required for maintenance, repair, and operations (MRO) purposes. DriveKNMS maintains stock of both new-surplus and tested-refurbished OZD PROFI units to support long-term asset lifecycle management.

OZD PROFI Full Catalog & Functionalities (SKU List)

The following SKUs represent verified models within the Hirschmann OZD PROFI series. Each unit is a fiber optic repeater/interface converter for PROFIBUS DP/FMS networks:

OZD PROFI 12M G12 PRO: 12-port fiber optic star coupler, 12 Mbit/s, multimode, PRO diagnostics
OZD PROFI 12M G12: 12-port fiber optic star coupler, 12 Mbit/s, multimode, standard version
OZD PROFI 12M G8 PRO: 8-port fiber optic star coupler, 12 Mbit/s, multimode, PRO diagnostics
OZD PROFI 12M G8: 8-port fiber optic star coupler, 12 Mbit/s, multimode, standard version
OZD PROFI 12M G4 PRO: 4-port fiber optic star coupler, 12 Mbit/s, multimode, PRO diagnostics
OZD PROFI 12M G4: 4-port fiber optic star coupler, 12 Mbit/s, multimode, standard version
OZD PROFI 12M G2 PRO: 2-port fiber optic repeater, 12 Mbit/s, multimode, PRO diagnostics
OZD PROFI 12M G2: 2-port fiber optic repeater, 12 Mbit/s, multimode, standard version
OZD PROFI 12M G12 EEC: 12-port star coupler, extended environmental class, -40°C to +70°C
OZD PROFI 12M G8 EEC: 8-port star coupler, extended environmental class, -40°C to +70°C
OZD PROFI 12M G4 EEC: 4-port star coupler, extended environmental class, -40°C to +70°C
OZD PROFI 12M G2 EEC: 2-port repeater, extended environmental class, -40°C to +70°C
OZD PROFI 12M G12 SM: 12-port star coupler, singlemode fiber, long-distance transmission
OZD PROFI 12M G8 SM: 8-port star coupler, singlemode fiber, long-distance transmission
OZD PROFI 12M G4 SM: 4-port star coupler, singlemode fiber, long-distance transmission
OZD PROFI 12M G2 SM: 2-port repeater, singlemode fiber, long-distance transmission
OZD PROFI 12M G12 PRO SM: 12-port star coupler, singlemode, PRO diagnostics, long-range

Sourcing Hard-to-Find & Obsolete OZD PROFI Parts

The OZD PROFI series is no longer in active production by Hirschmann/Belden. Lead times through standard distribution channels are extended or indefinite for most variants. DriveKNMS operates a dedicated inventory program for discontinued industrial automation components, with a focus on PROFIBUS infrastructure hardware including the full OZD PROFI range.

DriveKNMS sources OZD PROFI units through verified industrial surplus channels, decommissioned plant equipment, and authorized secondary market suppliers. All units are cataloged by part number, firmware revision where applicable, and physical condition grade. For facilities operating legacy PROFIBUS networks with no near-term migration path to PROFINET, DriveKNMS provides multi-year supply agreements to ensure continuity of spare parts availability. Customers in the petrochemical, power generation, and pharmaceutical sectors with long equipment qualification cycles particularly benefit from this service model.

Quality Control for the OZD PROFI Range

Each OZD PROFI unit processed by DriveKNMS undergoes a structured functional verification protocol prior to dispatch. The test procedure addresses the specific failure modes of fiber optic PROFIBUS repeaters, including optical port degradation, backplane bus arbitration faults, and power supply regulation failures.

Test procedures include: optical power output measurement on all fiber ports using calibrated optical power meters; PROFIBUS DP signal integrity verification at 9.6 kbit/s, 1.5 Mbit/s, and 12 Mbit/s baud rates; port-to-port isolation resistance measurement; LED diagnostic indicator functional check; and 24 VDC power input range verification (18–32 VDC). Units exhibiting optical power output below the manufacturer's minimum specification (-20 dBm for multimode variants) are rejected. All test results are logged against the unit serial number and retained for traceability. Refurbished units are clearly identified and priced separately from new-surplus stock.