Wago 750-628 Bus Extension Coupler Module for 750/753 I/O System Expansion

Product Overview

The Wago 750-628 Bus Extension Coupler Module is a specialized component of the Wago 750/753 Series I/O System, designed to enable the physical and logical expansion of fieldbus nodes beyond the limitations of a single I/O cluster-7 -9. This module acts as a transparent bridge, replacing the fieldbus coupler or controller at the head of an additional I/O block and creating a seamless extension of the internal data bus-7 -9. The Wago 750-628 allows system integrators to distribute I/O modules across multiple physical locations, with the extension being completely transparent to the fieldbus coupler or controller, preserving all I/O system functions without any modifications-7.

Engineered for the Wago 750/753 Series, the 750-628 Wago coupler module facilitates the construction of distributed I/O architectures where space constraints or application requirements demand physical separation. The module uses standard RJ-45 connectors and shielded copper Ethernet patch cables for interconnection, enabling the extension of the data bus over distances up to 5 meters between coupling modules-7 -9. Each Wago 750-628 can support up to 64 I/O modules per node depending on the hardware and software version, and the system can accommodate up to 10 extension levels, providing exceptional scalability for large and complex automation systems-7 -9.

The 750-628 Wago module is equipped with diagnostic LEDs that indicate the status of the system and field-side supply voltages, as well as communication status with adjacent blocks-7 -9. The module also features a terminating resistor switch, allowing it to function as either the last coupler in a system or as a bridge between two I/O block assemblies-7 -9. The power supply for the field side and the internal electronics can be fed in separately and are electrically isolated from each other, ensuring robust performance and protection for the control system-9. The Wago 750-628 is a critical tool for engineers designing flexible, scalable, and maintainable automation solutions.

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Description

Technical Specifications

Parameter	Value
Product Model	750-628
Manufacturer	Wago
Product Type	Bus Extension Coupler Module / Internal Data Bus Extension
Series	750/753 Series I/O System-7 -9
System Supply Voltage	DC 24V (-15% … +20%)-7 -9
Input Current Consumption (System)	150 mA (typical), 200 mA (max.)-7 -9
Max Current Output (System)	400 mA-2 -7 -9
Field Supply Voltage	DC 24V (-25% … +30%)-9
Field Supply Current (max.)	DC 10A (via power jumper contacts)-7 -9
Isolation	500V system/field supply-7 -9
Bus Connection	2 x RJ-45 socket (Input and Output)-1 -7 -9
Field Wiring Connection	CAGE CLAMP® (6 points)-7 -9
Wire Cross Section	0.08 … 2.5mm² / AWG 28 … 14-7 -9
Width	24mm / 0.945 inch-7 -9
Height	100mm / 3.937 inch (from upper edge of DIN rail: 64mm)-7 -9
Depth	69.8mm / 2.748 inch-7 -9
Weight	Approx. 70g-9
Enclosure Rating	IP20-1 -2 -4
Operating Temperature	0°C … +55°C-4 -11
Max. Number of I/O Modules per Node	64 (hardware/software version >= XXXX0103)-9
Max. Number of Coupler Modules	10-7 -9
Max. Extension Distance	5m (10m with manual adjustments)-7
Approvals	UL, EAC, KC, ATEX, Marine-4 -10 -11

Main Features and Advantages

Transparent System Expansion: The Wago 750-628 enables the extension of a fieldbus node without requiring any changes to the fieldbus coupler or controller configuration. The extension is completely transparent to the main controller, which sees the entire distributed I/O system as a single logical node-7 -9. This feature simplifies system design and integration, as no additional configuration or programming is required to accommodate the expanded I/O layout. The 750-628 Wago maintains all I/O module functionality across the extended bus, ensuring consistent and reliable operation.

Power Supply Flexibility and Isolation: The Wago 750-628 allows for separate input of the field-side power supply and the internal electronics power supply, which are galvanically isolated from each other (500V system/field)-7 -9. This isolation protects sensitive control electronics from potential voltage transients and ground loops on the field side. The module also features 3 self-cleaning power jumper contacts that pass the field supply voltage to downstream I/O modules, supporting a total current of up to 10A-7 -9. This design enables efficient power distribution across the extended I/O block.

Flexible Topology and Scalability: The 750-628 provides flexible mounting options, supporting deployment either as the final coupler in a system with the terminating resistor enabled, or as a bridge between two I/O module assemblies with the resistor disabled-7 -9. A system can include up to 10 750-628 Wago coupler modules, allowing for significant physical distribution of I/O points-7 -9. The module communicates with adjacent blocks via two RJ-45 sockets, with diagnostic LEDs indicating the communication status, simplifying troubleshooting and maintenance.

Comprehensive Diagnostics and Status Indication: The Wago 750-628 is equipped with multiple LED indicators that provide at-a-glance status information: two diagnostic LEDs indicate the state of the system and field supply voltage for the relevant block, while two additional LEDs on each RJ-45 socket indicate the communication status with adjacent blocks-7 -9. These diagnostic features significantly reduce troubleshooting time and enable operators to quickly identify and isolate issues within the distributed I/O system. The module also includes a switch for enabling or disabling a terminating resistor, ensuring proper bus termination in the final extension module.

High-Density I/O Support: The 750-628 supports up to 64 I/O modules per node (depending on the hardware/software version), providing high-density I/O capacity for complex automation systems-7 -9. With its compact 24mm width and lightweight design (approx. 70g), the module minimizes space requirements on the DIN rail while maximizing I/O capacity. The Wago 750-628 is also certified for use in hazardous areas (ATEX Ex) and marine applications, demonstrating its versatility and reliability in challenging environments-10 -11.