WAGO 750-333 – INTERBUS Fieldbus Interface Coupler | 750 Series Modular I/O System
Engineering Background
The WAGO 750-333 is a dedicated INTERBUS fieldbus interface coupler engineered for the WAGO 750 Series modular I/O system. As industrial automation networks demand deterministic, high-speed communication between PLCs and distributed I/O nodes, the 750-333 provides a robust, standards-compliant gateway that bridges INTERBUS ring topology with WAGO’s proven modular I/O architecture. Designed for process engineers and system integrators who require reliable, scalable field-level communication in demanding industrial environments.
Product Positioning
The WAGO 750-333 serves as the network head-end coupler in a WAGO 750 Series I/O station, enabling seamless integration of up to 64 I/O modules per node into an INTERBUS network. It is the preferred choice for OEMs and end-users operating Siemens, Phoenix Contact, or third-party INTERBUS master controllers who require a cost-effective, high-density I/O expansion solution with full INTERBUS protocol compliance (IEC 61158 Type 8).
Complete Technical Specifications
- Part Number / SKU: 750-333
- Manufacturer: WAGO Kontakttechnik GmbH & Co. KG
- Series: WAGO 750 Series Modular I/O System
- Function: INTERBUS Fieldbus Interface / Coupler
- Fieldbus Protocol: INTERBUS (IEC 61158 Type 8)
- Transmission Rate: 500 kbps
- Max. I/O Modules per Node: 64 modules
- Max. Process Data: 512 bytes input / 512 bytes output
- Supply Voltage: 24 V DC (via system bus)
- Current Consumption: Approx. 70 mA at 24 V DC
- Operating Temperature: -25 °C to +55 °C
- Storage Temperature: -40 °C to +85 °C
- Protection Rating: IP20
- Mounting: DIN 35 rail (EN 60715)
- Housing Material: Polycarbonate (PC), flame-retardant
- Dimensions (W × H × D): 51.5 mm × 100 mm × 71.5 mm
- Weight: Approx. 200 g
- Certifications: CE, UL, cUL, ATEX (Zone 2), GL
- Connection Type: CAGE CLAMP® spring-clamp terminals
- Diagnostic LEDs: PWR, BA (Bus Active), RBE (Remote Bus Error), LBE (Local Bus Error)
- HS Code: 8538.90.99
- Country of Origin: Germany
Proven Application Environments
- Discrete Manufacturing: Automotive assembly lines, robotic welding cells, and conveyor control systems requiring deterministic I/O response times.
- Process Industry: Chemical plants, water treatment facilities, and oil & gas installations where INTERBUS ring topology provides inherent fault detection.
- Building Automation: HVAC control panels, access control systems, and energy management nodes integrated into INTERBUS networks.
- Machine Tool & Packaging: CNC machine I/O expansion and high-speed packaging line control with synchronized fieldbus communication.
- Power Generation & Utilities: Substation automation and distributed control panels requiring IEC-compliant fieldbus interfaces.
Engineering Advantages
- Modular Scalability: Supports up to 64 WAGO 750 Series I/O modules per coupler node — flexible, application-specific I/O configurations without rewiring.
- CAGE CLAMP® Wiring Technology: Tool-free, vibration-resistant spring-clamp connections eliminate loose-wire failures common in screw-terminal alternatives.
- Integrated Diagnostics: Four onboard LEDs provide real-time bus status, remote bus error, and local bus error indication — reducing MTTR in fault conditions.
- Wide Temperature Range: Rated -25 °C to +55 °C, suitable for unheated enclosures and outdoor cabinet installations.
- Multi-Certification Compliance: CE, UL, cUL, ATEX Zone 2, and GL approvals support global deployment across regulated industries.
- Hot-Swap Compatible I/O Modules: Downstream 750 Series I/O modules can be exchanged without powering down the entire node.
System Architecture & Signal Flow
The WAGO 750-333 operates as a remote bus device within an INTERBUS ring. The INTERBUS master (PLC or controller) communicates via the remote bus (RS-485 differential pair) to the 750-333 coupler. The coupler translates INTERBUS protocol frames into WAGO’s internal local bus, distributing process data to downstream 750 Series digital and analog I/O modules. Data flows cyclically: the master initiates a scan cycle, the 750-333 collects all I/O module data into a contiguous process image, and returns it to the master within the INTERBUS frame. Diagnostic data is transmitted in the ID cycle, enabling the master to identify each node and module type automatically.
Typical Topology: INTERBUS Master → Remote Bus Cable (RS-485, max 400 m/segment, 12.8 km total) → WAGO 750-333 → Internal Local Bus → Up to 64 × 750 Series I/O Modules → End Module (750-600)
Sourcing & Quality Verification
- Origin: Genuine WAGO product, sourced through authorized industrial distribution channels.
- Condition: New (factory-sealed) and tested refurbished units available — condition specified at time of quotation.
- Traceability: Each unit ships with manufacturer date code and batch traceability documentation upon request.
- Inspection: All units undergo functional verification including bus communication test and LED diagnostic check prior to dispatch.
- Packaging: Original WAGO anti-static packaging retained where available; ESD-safe repackaging applied to refurbished stock.
Procurement Process
- Confirm Part Number: Verify 750-333 against your BOM or existing system documentation. Cross-reference with WAGO catalog for hardware revision compatibility.
- Request Quotation: Contact Konmask via email or phone with required quantity, delivery timeline, and condition preference (new / refurbished).
- Order Confirmation: Purchase order accepted via email. Proforma invoice issued within 1 business day.
- Shipping: DHL Express / FedEx International Priority standard. EXW Xiamen, China. Lead time: 1–5 business days for in-stock units.
- After-Sales Support: 12-month warranty on new units. Technical support available via email for integration queries.
Technical FAQ
Q: Is the WAGO 750-333 compatible with Phoenix Contact INTERBUS masters?
A: Yes. The 750-333 is fully compliant with INTERBUS (IEC 61158 Type 8) and interoperable with any certified INTERBUS master, including Phoenix Contact IBS controllers.
Q: How many I/O points can one 750-333 node support?
A: Up to 64 I/O modules per coupler, with a maximum process data width of 512 bytes input and 512 bytes output, depending on the I/O module mix.
Q: Can the 750-333 be used in ATEX Zone 2 hazardous areas?
A: The 750-333 carries ATEX Zone 2 approval. For Zone 1 or Zone 0 applications, consult WAGO’s Ex-certified I/O module range and applicable installation standards.
Q: What is the maximum INTERBUS remote bus cable length?
A: INTERBUS supports a total remote bus length of up to 12.8 km, with a maximum segment length of 400 m between two devices using standard RS-485 cable.
Q: Does Konmask provide a certificate of conformity?
A: Yes. A certificate of conformity and, where available, original WAGO test documentation can be provided upon request for new units.
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