Web-IO 4.0 230V relay 4xNO, 4xCO

Versatile Remote Control with the Web-IO 4.0 230V Relay 4xNO, 4xCO from Wiesemann & Theis

In modern industry and building automation, precise control of switching signals is essential for optimizing processes and ensuring operational safety. The Web-IO 4.0 230V Relay 4xNO, 4xCO from Wiesemann & Theis is a powerful, network-enabled device featuring eight bistable relay outputs (four normally open contacts and four changeover contacts) for 230V mains voltage. With an intuitive web interface, comprehensive network services, and support for protocols such as OPC UA, MQTT, and REST, it is ideally suited for Industry 4.0 and the Internet of Things (IoT). This article highlights the technical features, application areas, and benefits of this versatile device, designed for remote control, building automation, and smart home solutions.

Powerful Control of 230V Switching Signals

The Web-IO 4.0 230V Relay 4xNO, 4xCO has eight switching outputs implemented via bistable relays. It includes four potential-free normally open contacts (NO) and four potential-free changeover contacts (CO), all designed for 230V mains voltage. The relays support switching currents up to 6 A, allowing control of devices such as lighting, motors, heating systems, or other 230V consumers. Bistable technology ensures that the relays retain their switch state even without continuous power supply, enhancing energy efficiency and providing reliable function during power outages. These features make the device ideal for applications such as remote control, process monitoring, and machine data acquisition (MDA), where accurate and dependable 230V control is required.

Intuitive Operation and Network Integration

The Web-IO 4.0 230V Relay is extremely user-friendly thanks to an intuitive web interface that can be switched between German and English. Users can control the relay outputs directly via the web interface, with the bistable relays allowing fast and reliable switching. The interface is optimized for use on smartphones, making control possible on the go. Support for HTTP and HTTPS ensures secure communication. Developers can access the current relay states using HTTP requests, AJAX, or JavaScript, facilitating integration into other websites or applications. The box-to-box function enables direct 1-to-1 forwarding of switching signals over the network, making cross-location control simple. These connectivity options make the device ideal for networked control in connected environments.

Flexible Alarm and Notification Functions

The Web-IO 4.0 230V Relay offers comprehensive options for alarms and status notifications. Up to 30 actions can be configured to trigger automatically when changes occur on the relay outputs. These include email notifications, SNMP alarms (traps V1, V2, V3), switching its own relay outputs, operating another Web-IO device’s outputs, or sending HTTP requests to third-party devices. These features are especially advantageous in critical applications such as remote monitoring or fault detection, where rapid responses to switching events are essential. The ability to send status messages via email supports documentation and analysis of switching operations, making it a valuable tool for audits and quality management.

Seamless Integration with Industry 4.0 and IoT

The Web-IO 4.0 230V Relay is perfectly equipped for the demands of Industry 4.0 and the Internet of Things. It supports modern protocols such as OPC UA, REST, and MQTT for easy integration into automation systems and IoT platforms. AMQP is also supported upon request. Additional interfaces such as SNMP V1, V2c, V3, Modbus TCP, OPC DA, Syslog, and Sensobase (ODBC database integration) provide connectivity with existing systems and databases. Developers can access relay states directly via TCP and UDP sockets (client and server) to create custom solutions. FTP support enables logging of switching operations, increasing the traceability of processes. These connectivity features make the device a future-proof solution for building automation, smart homes, and industrial use.

Data Logging and Time Management

The Web-IO 4.0 230V Relay includes an integrated data logger that records switching events and status changes. Storage capacity ranges from a minimum of 7 weeks up to 20 years, depending on the selected logging frequency (15 seconds to 1 hour). Data can be exported in various formats, such as via FTP, Excel files, or email attachments, facilitating further processing. An internal, battery-backed clock ensures accurate timestamps, which can be optimized by synchronizing with a time server. These features allow reliable documentation and analysis of switching actions, which is particularly useful in process monitoring and machine data collection.

Versatile Application Possibilities

The Web-IO 4.0 230V Relay 4xNO, 4xCO is designed for a wide variety of applications. In remote monitoring and fault detection, it can control devices such as lighting, motors, or heating systems and report changes in status. In building automation, it enables switching of equipment such as lights, gates, or barriers and supports system-wide control across locations. In smart home environments, it automates lighting or heating systems, enhancing comfort and energy efficiency. In industrial settings, it is suitable for process visualization and monitoring, as well as for machine data acquisition (MDA) to support production optimization. Bistable relays ensure reliable switching even in the event of power failure. Further use cases include access control and automated gate systems.

Flexible Power Supply and Standards Compliance

The Web-IO 4.0 230V Relay is powered by an external 230V AC, 50 Hz power supply via a screw terminal connection. This configuration is ideal for applications that operate directly on 230V mains voltage. The device complies with standards for office and industrial environments and provides high immunity according to EN 61000-6-2, and low emissions according to EN 55032:2015 + A1 Class B, EN 61000-3-2, and EN 61000-3-3. These features ensure reliable, interference-free operation even in demanding environments.

Durability and Reliability

The Web-IO 4.0 230V Relay is designed for continuous operation and is backed by a five-year warranty. Its robust construction and DIN rail mounting capability make it ideal for industrial applications. The internal battery-buffered clock enables precise timekeeping, which is further enhanced by time server synchronization. The bistable relays increase reliability by maintaining their state even during power outages. These features demonstrate the device’s long-term durability and operational reliability under harsh conditions.

An Essential Tool for Remote 230V Control

The Web-IO 4.0 230V Relay 4xNO, 4xCO from Wiesemann & Theis is a powerful and versatile solution for network-based control and remote switching of 230V signals. With its eight bistable relay outputs (four NO and four CO) and extensive networking capabilities, it offers a flexible solution for building automation, smart homes, process monitoring, and industrial data acquisition. Support for modern protocols such as OPC UA, MQTT, and REST, as well as the intuitive web interface, make it perfectly suited for Industry 4.0 applications. Whether controlling lights, motors, or barriers, or logging switching operations – this device is an indispensable tool for professional users.