Description: The WAGO 750-338 is a CANopen Fieldbus Coupler with D-Sub 9 connection, manufactured by WAGO Kontakttechnik GmbH as the head station of the modular WAGO-I/O-SYSTEM 750, linking up to 64 downstream digital, analog, and specialty I/O modules to a CANopen master over a single 4-wire bus. Operating as an NMT slave with support for PDO and SDO communication, the 750-338 automatically detects every I/O module plugged into the rail, builds a local process image of up to 512 bytes in and 512 bytes out, and maps that image into the CANopen object directory — no programming required to stand up a fully functional remote-I/O station.
Application Scenarios: Consider a bottling-line retrofit on a high-speed filling machine where the OEM’s legacy control panel is being replaced but the plant wants to keep wiring costs contained and the existing CANopen-based Siemens PLC in place. Rather than pulling hundreds of individual conductors from sensors and actuators back to a central cabinet, the integrator drops a single 750-338 CANopen coupler onto the DIN rail at the machine, then clicks on the exact mix of digital input, digital output, analog, counter, and relay modules the application requires — typically a dozen modules spanning all signal types on one rail. The coupler automatically enumerates the assembled I/O, publishes the process image over CANopen at 1 MBaud, and the PLC sees the whole station as a single CANopen slave with standard DS-401 I/O profile objects. The pain point the 750-338 solves here is the classic one in distributed I/O: how to put signal-level I/O close to the machine without giving up a single, auditable control-network connection back to the PLC. That same pattern repeats across automotive conveyor segments, packaging machines, crane and hoist controls, wastewater treatment skids, and marine/shipboard automation — the latter specifically validated by the coupler’s ABS, BV, DNV GL, Lloyd’s Register, Nippon Kaiji, PRS, and RINA ship approvals.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 750-338 |
| Manufacturer | WAGO Kontakttechnik GmbH & Co. KG |
| Product Category | CANopen Fieldbus Coupler, WAGO-I/O-SYSTEM 750 head station |
| Fieldbus Protocol | CANopen per CiA DS-301 V4.1, device profile DS-401 V2.0 |
| Bus Connection | 1 × D-Sub 9 (shielded Cu cable, 3 × 0.25 mm²) |
| Baud Rate | 10 kbit/s to 1 Mbit/s |
| Bus Segment Length (max) | 1000 m (baud-rate dependent) |
| Max Nodes per CANopen Master | 110 |
| Max I/O Modules per Node | 64 |
| Process Image (Fieldbus, max) | 512 bytes in / 512 bytes out |
| PDO / SDO Resources | 32 Tx / 32 Rx PDOs with variable mapping; 2 SDO servers |
| Supply Voltage (system & field) | DC 24 V (−25% / +30%), via CAGE CLAMP® |
| Input Current at Nominal Load | 500 mA typ; power-supply efficiency 87% |
| Isolation | 500 V system/field |
| Power Jumper Contacts | 3 outgoing, rated 10 A each |
| Dimensions (W × H × D) | 50.5 × 100 × 71.1 mm |
| Weight | 177 g |
| Operating Temperature | 0 °C to +55 °C (storage −40 °C to +85 °C) |
| Protection / Mounting | IP20; DIN-35 rail, horizontal or vertical |
| Approvals | CE, ATEX, IECEx, UL 508 / UL 121201 (Hazardous Locations), KC, marine ABS/BV/DNV GL/LR/NK/PRS/RINA |
