In modern industrial and building technology, the reliable detection and control of electrical signals are indispensable. The Web-IO 4.0 Digital 1x230V In, 1xRelay Out from Wiesemann & Theis has been specially developed for applications where 230V signals must be safely monitored and switched. As a compact, network-capable device, it provides both a 230V input for signal monitoring and a potential-free relay output for controlling external loads – fully integrable into modern industrial networks and the Internet of Things (IoT).

This model is particularly designed for situations where reliability, real-time communication, and precise control are essential. Thanks to support for protocols such as MQTT, OPC UA, REST, and other industry standards, it can be seamlessly integrated into existing systems. Whether in building automation, production environments, or technical monitoring applications – the device guarantees flexibility, stability, and future readiness.

Operation via the integrated web interface enables intuitive control and monitoring – without any additional software. With this product, Wiesemann & Theis delivers a tool that creates a practical, safe, and intelligent connection between switching signal and network – not only for electricians and building technicians but also for IT specialists.

The following sections describe the technical features, applications, and special advantages of the Web-IO 4.0 Digital 1x230V In, 1xRelay Out.

Precise signal monitoring with integrated event counter

The Web-IO 4.0 Digital 1x230V In, 1xRelay Out is equipped with a robust input for 230V signals. The integrated 32-bit event counter records switching operations, movements, or external signal changes with precision. This makes the system suitable for process monitoring and machine data acquisition (MDA), where 230V pulses must be reliably captured. Thanks to its high accuracy, the device can also be used in safety-critical environments, such as alarm signaling or motor control.

The potential-free relay output can handle loads up to 16 A at 230V AC. This allows the control of almost all common devices, lamps, heaters, barriers, or machines. In industrial processes, it enables targeted switching of external systems depending on measured values or input events while ensuring safe operation at all times.

Easy operation via the integrated web interface

Control is managed through a clearly structured graphical web interface. It is multilingual (German/English) and accessible from both desktop computers and mobile devices. Users can view the current state of the 230V input in real time and switch the relay output directly. Thanks to its responsive design, convenient operation via smartphone is possible – especially useful for field service applications or remote monitoring.

Furthermore, the system supports a variety of secure communication methods such as HTTP and HTTPS. Using AJAX, JavaScript, or REST requests, all I/O states can be programmatically integrated into external applications or web pages. This allows the Web-IO to be seamlessly integrated into customized interfaces or control platforms.

Network intelligence and enhanced communication

One of the main features of the device is its comprehensive network connectivity. In addition to standard protocols such as MQTT, OPC UA, and REST, interfaces like SNMP (V1–V3), Modbus TCP, Syslog, and Sensobase are supported. This ensures effortless integration into existing IT systems and automation environments. Communication via TCP and UDP sockets is also supported, allowing custom control logic implementations.

With the convenient box-to-box function, switching signals can be mirrored over the network to a second Web-IO device. This enables 1:1 communication between two distant devices, such as between separate buildings, production lines, or warehouse areas.

Flexible alarm and notification systems

For maximum safety, up to 30 actions can be preconfigured to automatically respond to input or output events. Examples include:

• Automatic sending of email notifications
• SNMP traps for IT-based network monitoring
• Control of internal or external relay outputs
• HTTP requests to other systems or cloud servers

These functions ensure early detection of operational failures and allow users to intervene proactively. Especially in critical production environments or in process control systems with high safety requirements, this continuous real-time reporting is a decisive advantage.

Data logging and time management

The built-in data logger makes it possible to automatically record switching or state changes over long periods. Depending on the selected storage interval (between 15 seconds and one hour), storage capacity can be extended for weeks or even decades. Logged data can be exported via email, FTP, or in Excel format, allowing easy reuse for documentation or statistical analysis.

The internal battery-backed real-time clock ensures all data entries receive precise timestamps. Synchronization with a time server keeps logging accurate and traceable at all times – a key requirement for audits and process analysis.

Practical use cases

• Building automation: control of 230V loads such as lighting systems, roller doors, or pumps.
• Industrial system monitoring: detection of 230V signals for machines or production lines.
• Remote monitoring: condition and alarm notifications in response to signal changes.
• Home automation: automated switching of lighting, air conditioning, or heating systems over a network.
• Fault detection: proactive error identification in technical systems to minimize downtime.

Power supply and standard compliance

The power supply is provided directly via 230V AC (50 Hz). This design allows integration into existing electrical installations without additional power adapters. The device complies with industry standards such as EN 61000-6-2 (immunity) and EN 55032:2015 + A1 (emission) and meets requirements for both industrial and office environments. This guarantees long-term, safe, and interference-free operation.

Durability and continuous operation

The product is designed for continuous operation. Its robust construction allows deployment under demanding conditions in control cabinets or switchgear systems. DIN rail mounting makes installation straightforward and ensures solid integration. The device comes with a standard five-year warranty, underlining its high build quality.

Compact 230V control for modern network systems

The Wiesemann & Theis Web-IO 4.0 Digital 1x230V In, 1xRelay Out combines classical electrical installation with modern network technology. It is the ideal solution for users who need to monitor and control 230V signals while benefiting from the flexibility of network communication. With support for protocols like OPC UA, MQTT, and REST, an integrated data logger, and an easy-to-use web interface, this compact device provides a powerful, safe, and efficient automation solution for businesses, public institutions, and private users.

Whether for building automation, remote monitoring, process control, or machine data acquisition – this device from Wiesemann & Theis stands for quality, precision, and reliability in industrial and automation environments.