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 Product Name Signal SD-DR RelayCube™ Multi-Wire Expansion Module Product Type Multi-Wire Expansion Module for SDS Series Two-Wire Controllers Primary Function Allows SDS Controllers to Operate Conventional 24VAC Solenoid Valves Valve Outputs per Module 24 Conventional 24VAC Solenoid Outputs Controller Compatibility Signal SDS-50 and SDS-100 SDS-50 Expansion Capacity Up to 2 RelayCubes™ for 48 Conventional Valve Outputs SDS-100 Expansion Capacity Up to 4 RelayCubes™ for 96 Conventional Valve Outputs Communication Integrated through the Signal SDS Two-Wire Network Power Requirement Separate 24VAC Power Supply Power Supply Included No Installation In-Line Anywhere Along the Two-Wire Cable Valve Compatibility Conventional 24VAC Solenoids Hybrid Operation Supports Mixed DataValve™/DataCoil™ and Conventional 24VAC Solenoid Installations Addressing Addressable through the SDS Control System Unused Address Allocation Unused RelayCube™ Addresses Can Be Allocated to Compatible DataCoil™ Devices Status Indicators Valve Operation, Power, Communication, and Fuse/Reset Status LEDs Short-Circuit Protection Resettable Circuit Breaker Construction Rugged Field-Ready Enclosure with Labelled Terminal Connections 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.