Product Overview
The WAGO 750-338 is a PROFIBUS DP fieldbus coupler, serving as the intelligent central unit and communication gateway for a WAGO-I/O-SYSTEM 750 station. This module is the foundational component that transforms a collection of individual WAGO digital, analog, and special function I/O modules into a cohesive, addressable node on a PROFIBUS DP network. Its primary function is to manage all data exchange between the higher-level automation controller (the PROFIBUS DP master, such as a Siemens S7 PLC) and the connected field devices wired to the I/O modules. The WAGO 750-338 handles the complex tasks of mapping I/O data into the process image, managing the internal power distribution for the connected modules, and providing comprehensive diagnostic information for the entire station. It effectively acts as the “brain” of a remote or distributed I/O drop, enabling decentralized control architectures that reduce wiring costs and improve system flexibility.Designed for maximum versatility, the WAGO 750-338 supports the connection of up to 64 WAGO I/O modules on its right side via the proprietary internal local bus (WAGO I/O System bus), allowing for the creation of dense, highly customized I/O stations. The coupler automatically detects and identifies all connected modules, simplifying configuration. It is engineered for robust industrial performance, with features like a wide operating temperature range, high immunity to electromagnetic interference, and secure screw-cage clamping connections. The WAGO 750-338 provides a reliable and deterministic link to the PROFIBUS DP-V1 network, supporting standard cyclical data exchange as well as acyclic services for parameterization and diagnostics. For system integrators, this coupler is the key to leveraging WAGO’s renowned modular I/O system, enabling the creation of scalable, maintainable, and high-performance automation solutions across a vast array of industries.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 750-338 |
| Manufacturer | WAGO Kontakttechnik |
| Product Type | Fieldbus Coupler for PROFIBUS DP-V1 |
| Fieldbus Protocol | PROFIBUS DP-V1 slave |
| PROFIBUS Address Setting | Via DIP switch or software (address range 1-125) |
| Baud Rate | Auto-sensing, 9.6 kbps to 12 Mbps |
| Number of Modules | Supports up to 64 WAGO 750 series I/O modules |
| Internal Bus | WAGO I/O System Bus (local bus for module communication) |
| Process Image Size | Up to 244 bytes input and 244 bytes output |
| Supply Voltage | 24 V DC (via power feed module or direct connection) |
| Power for I/O Modules | Supplies 5 V DC and 24 V DC to the local bus |
| Status Indicators | LEDs for power, bus error, bus activity, diagnostics, and I/O status |
| Operating Temperature | -25 °C to +55 °C (extended range with derating) |
| Storage Temperature | -40 °C to +85 °C |
| Connection Technology | CAGE CLAMP® screwless spring pressure connection |
| Housing Material | Polycarbonate |
| Dimensions | Approx. 100 mm x 12 mm x 64 mm (HxWxD) |
| Certifications | CE, UL, ATEX, IECEx, DNV GL, etc. |
Main Features and Advantages
The WAGO 750-338 PROFIBUS DP coupler stands out for its plug-and-play simplicity, robust connectivity, and diagnostic depth. A key feature is its automatic module recognition. Upon power-up, the coupler scans the local bus, identifies all connected I/O modules by their electronic type codes, and automatically assigns addresses within the process image. This eliminates manual address setting and drastically reduces commissioning time and potential for configuration errors. The coupler supports the full PROFIBUS DP-V1 standard, enabling not only fast, cyclical exchange of I/O data but also advanced acyclic communication for reading detailed module information, writing parameters, and retrieving comprehensive diagnostic data, which is invaluable for preventative maintenance.
