Signal SD-DR RelayCube™ Multi-Wire Expansion Module for SDS Two-Wire Irrigation Controllers – 24 Outputs per Module

The Signal SD-DR RelayCube™ is a plug-and-play multi-wire expansion module designed for Signal SDS Series Two-Wire Irrigation Controllers. It allows an SDS controller to operate conventional 24VAC solenoid valves while retaining the flexibility of the SDS two-wire architecture. Each RelayCube™ adds 24 conventional valve outputs and can be installed anywhere along the two-wire network, making it ideal for retrofit projects, hybrid irrigation systems, and installations where existing multi-wire valve infrastructure needs to be retained. With dedicated 24VAC power, LED status indication, resettable short-circuit protection, and support for mixed DataCoil™ and conventional solenoid operation, the RelayCube™ provides a practical way to expand and modernise existing irrigation systems.

Suitable Applications

• Retrofit irrigation projects using existing 24VAC solenoid valves
• Hybrid two-wire and conventional multi-wire irrigation systems
• Commercial landscape irrigation systems
• Sports fields and turf irrigation installations
• Municipal parks and public landscape systems
• Schools, campuses, and large residential estates
• Expansion of Signal SDS-50 and SDS-100 irrigation systems
• Sites requiring remote multi-wire valve outputs along a two-wire path
• Projects transitioning gradually from conventional solenoids to DataCoil™ technology

Key Specifications

Features

• Adds 24 conventional 24VAC solenoid outputs to a compatible Signal SDS irrigation system
• Enables hybrid operation between two-wire DataCoil™ devices and conventional multi-wire solenoid valves
• Provides a practical upgrade path for existing irrigation systems without requiring immediate replacement of all field solenoids
• Connects directly to the SDS two-wire network for integrated controller communication
• Can be installed remotely along the two-wire path rather than being limited to the controller location
• Each RelayCube™ uses its own dedicated 24VAC power supply
• SDS-50 controllers support up to two RelayCube™ modules
• SDS-100 controllers support up to four RelayCube™ modules
• Allows up to 48 conventional outputs on SDS-50 systems and up to 96 conventional outputs on SDS-100 systems
• Unused RelayCube™ addresses can be assigned to compatible DataCoil™ devices for flexible mixed-system configurations
• Individual valve-operation LEDs provide immediate visual indication of active outputs
• Dedicated power and communication LEDs assist with field diagnostics
• Resettable short-circuit protection helps protect output wiring against electrical overloads
• Labelled terminal connections simplify installation and ongoing servicing
• Plug-and-play modular design allows system capacity to be expanded as site requirements change

Benefits

• Ideal for Retrofits: Existing 24VAC solenoid valves can remain in service while the irrigation system is upgraded to an SDS two-wire controller architecture.
• Flexible Hybrid Design: Conventional solenoids and Signal DataCoil™ devices can operate within the same control system, allowing gradual upgrades rather than complete field replacement.
• Remote Expansion: RelayCubes™ can be positioned along the two-wire network close to groups of existing valves, potentially reducing long multi-core cable runs back to the controller.
• Scalable Capacity: Each module adds 24 outputs, with up to 48 conventional outputs available on SDS-50 systems and up to 96 on SDS-100 systems.
• Fast Troubleshooting: Power, communications, valve activity, and protection indicators provide clear visual feedback for contractors and maintenance personnel.
• Field Protection: Resettable short-circuit protection helps isolate electrical problems and protects connected valve wiring from overload conditions.
• Lower Upgrade Complexity: The ability to retain existing 24VAC field hardware can reduce replacement costs and simplify modernisation of established irrigation sites.