Application Scenarios
In a large-scale water treatment plant, the control cabinet layout was constrained by existing cable tray routing and panel space. A single continuous WAGO I/O node could not exceed 780 mm without violating thermal spacing requirements. The engineering team installed a 750-628 at the end of the primary module block, then routed a shielded RJ-45 patch cable to a secondary cabinet where a 750-627 end module terminated a second block of I/O slices. The fieldbus coupler recognized the extension transparently, with no programming changes required. This arrangement allowed the plant to centralize high-density analog input modules in one cabinet while placing discrete output slices adjacent to motor control centers, reducing field wiring runs significantly.
Parameter
| Parameter | Value / Description |
|---|---|
| Product Model | 750-628 |
| Manufacturer | WAGO Kontakttechnik GmbH & Co. KG (Germany) |
| Product Category | Bus Extension Coupler Module (I/O System 750) |
| System Compatibility | WAGO I/O System 750/753 |
| Bus Connection | 2 × RJ-45 sockets (input + output) |
| Max System Extension | Up to 250 I/O modules total (with 750-627) |
| Max Coupler Modules | Up to 10 per fieldbus node |
| Inter-Block Cable Length | 5 m standard (10 m per manual) |
| Transmission Medium | Shielded twisted-pair copper (Ethernet patch cable, 4×2×0.25 mm²) |
| Supply Voltage | DC 24 V (−15% … +20%) via system supply |
| Current Consumption | 150 mA @ 5 V system supply (internal) |
| Isolation | 500 V system/supply |
| Mounting | DIN-35 rail (TS 35) |
| Dimensions (W×H×D) | 24 × 64 × 100 mm |
| Protection Class | IP20 |
| Ambient Temperature | 0 °C … +55 °C (operation) |
Technical Principles and Innovative Values
Innovation Point 1 — Transparent bus extension without controller reconfiguration. The 750-628 does not introduce a new fieldbus address, node, or programming entity. To the fieldbus coupler/controller, the extension is completely transparent; all I/O modules across all blocks behave as if they were mounted in a single continuous row. This eliminates the engineering overhead typically associated with remote I/O solutions, which require separate couplers, addresses, and process image mapping.
Innovation Point 2 — Modular physical partitioning with maintained electrical continuity. By splitting a node into up to 11 blocks (one primary + up to 10 extension blocks), the 750-628 enables cabinet layouts that respect thermal zones, cable entry points, and maintenance access corridors. The RJ-45 interconnection carries the internal data bus and system supply, while the CAGE CLAMP terminals on the module provide separate feed points for field-side power, maintaining galvanic isolation between system and field levels.
Innovation Point 3 — Selectable terminating resistor for flexible topology. The module includes a switch-operated terminating resistor, allowing it to function either as the last coupler in a chain (termination enabled) or as an intermediate bridge between blocks (termination disabled). This flexibility supports both linear and branched cabinet topologies without additional hardware.
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