Industrial Networking

OZD PROFI 12M G12 PRO

OZD PROFI 12M G12 PRO - PROFIBUS Fiber-Optic Repeater | Hirschmann

The Belden Hirschmann OZD PROFI 12M G12 PRO is an industrial PROFIBUS fiber-optic repeater and electrical-to-optical interface converter designed for harsh factory automation environments. This DIN-rail mounted device converts between PROFIBUS RS-485 electrical signals (9-pin Sub-D, female, EN 50170 part 1 compliant) and optical signals on dual BFOC 2.5 (STR) fiber ports, supporting PROFIBUS DP-V1, DP-V2, and FMS protocols. The unit is qualified for quartz glass multimode fiber (50/125 µm and 62.5/125 µm), enabling segment extension and star/ring/linear PROFIBUS topologies. A PROFIBUS fiber-optic repeater is an industrial networking device that bridges an electrical RS-485 PROFIBUS segment with an optical fiber segment, regenerating signal integrity and electrically isolating the two media. Repeaters sit within the PROFIBUS DP physical layer (Layer 1) and physical-layer-aware portions of the data-link layer, extending total network reach beyond the electrical limit (~1.2 km without repeaters per PROFIBUS DP EN 50170) and providing galvanic isolation that protects downstream devices from ground-potential differences and electromagnetic interference common in motor-drive cabinets. Key features include signal regeneration (repeater function), dual optical channels for redundant or ring topologies, optical signal intensity monitoring per channel, and on-device DIP-switch configuration of bus terminating resistors, optical operating mode, and functional compatibility. The device also offers conformal coating on internal electronics and is rated for Ex-zone 2 / Class I Division 2 hazardous locations, supporting installation in chemical, oil & gas, and process-industry cabinets. The compact DIN-rail enclosure minimizes cabinet footprint in dense control panels. Technical depth: the OZD PROFI 12M G12 PRO uses 850 nm VCSEL transceivers compatible with both 50/125 µm and 62.5/125 µm multimode glass fiber, with typical segment lengths up to 3 km depending on fiber type and dynamic link budgets. Hardware isolation between the electrical PROFIBUS segment and the optical segment prevents ground-loop noise and transient overvoltages from one segment from propagating into the other, which is critical when the PROFIBUS cable must run alongside variable-frequency drives or high-current motor feeders. Typical applications include PROFIBUS DP backbone segmentation in process-industry DCS systems, redundant ring topologies connecting PLC islands in automotive body-in-white lines, fiber-optic extension of PROFIBUS segments across galvanically isolated EMC zones inside a single plant, fiber-optic PROFIBUS DP networks in hazardous-area Zone 2 chemical plants, and optical PROFIBUS segments in wastewater treatment and water SCADA facilities. According to Hirschmann documentation, devices can be mixed in mixed topologies of the OZD Profi 12M family for flexible redundancy. When designing with this device, ensure all PROFIBUS devices on a single electrical segment share the configured baud rate (9.6 kbps to 12 Mbps), and that only one device per segment drives terminating resistors (typically via DIP switch S0). Use only Hirschmann-recommended quartz glass fiber for full link-budget compliance; mixing plastic optical fiber with this high-power repeater risks optical overdrive of the receiver. Configure functional-compatibility switch S8=0 when connecting older OZD Profi 12M...c hardware. This page synthesizes distributor pricing, parametric comparison data, drop-in alternatives, and installation notes from the OZD Profi 12M G12 PRO manual (Rel. 07 / 11/2022) that are not aggregated on any single distributor page.