Web-IO 4.0 Digital 2x In, 2x Relay Out

Versatile Control and Monitoring with the Web-IO 4.0 Digital 2× In, 2× Relay Out from Wiesemann & Theis

In modern industrial and building automation, reliable control and monitoring of switching signals are essential for optimizing processes and ensuring operational safety. The Web-IO 4.0 Digital 2× In, 2× Relay Out from Wiesemann & Theis is a network-enabled device that controls two potential-free relay changeover contacts (CO) via TCP/IP Ethernet and offers two switching inputs to monitor potential-free contacts.

With an intuitive web interface, comprehensive network services, and protocols such as OPC UA, MQTT, and REST, it is optimized for Industry 4.0 and the Internet of Things (IoT). This article highlights the technical features, applications, and advantages of this versatile device, developed for remote monitoring, building automation, and home automation.

Precise Control and Monitoring

The Web-IO 4.0 Digital features two switching inputs activated by potential-free contacts and equipped with integrated 32-bit pulse counters to capture events such as switching actions or pulses.

The two switching outputs are potential-free changeover contacts (CO) with a switching voltage of up to 48 V (or 110 V / 230 V via coupling relays) and a switching current of max. 2 A at 24 V or 0.5 A at 48 V. These features enable precise control of devices like lights, gates, or barriers, as well as monitoring sensors or switches in industrial and private settings. The input/output combination makes the device ideal for process monitoring, machine data acquisition (MDE), and alarm reporting.

Intuitive Operation and Network Integration

The Web-IO 4.0 Digital is extremely user-friendly thanks to its intuitive web interface, switchable between German and English. Users can control outputs directly via the interface and monitor input states in real time. The interface is smartphone-optimized for mobile control. HTTP and HTTPS support ensures secure communication. Developers can access current I/O states via HTTP requests, AJAX, or JavaScript to integrate the device into other web pages or applications.

The box-to-box feature allows 1:1 forwarding of switching signals over the network, facilitating location-independent control. These connectivity options make the device ideal for networked environments.

Flexible Alarm and Notification Functions

The Web-IO 4.0 Digital offers extensive alarm and status notification capabilities. Up to 30 actions can be configured to trigger automatically on input or output changes. These include e‑mail notifications, SNMP alarms (SNMP-Traps V1, V2, V3), toggling its own outputs, controlling outputs of another Web-IO, or HTTP requests to control third-party devices. These functions are especially valuable in critical applications like remote monitoring or alarm reporting, where fast responses are required. The ability to send status reports by e‑mail supports documentation and analysis of switching events, crucial for audits and quality management.

Seamless Integration into Industry 4.0 and IoT

The Web-IO 4.0 Digital is fully prepared for Industry 4.0 and IoT demands. It supports modern protocols like OPC UA, REST, and MQTT. AMQP support is available on request. Additional interfaces such as SNMP V1, V2c, V3, Modbus TCP, OPC DA, Syslog, and Sensobase (database integration via ODBC) enable connection to existing systems and databases. Developers can access I/O states directly via TCP and UDP sockets (client and server) to develop custom solutions. FTP support allows logging of switching signals, enhancing process traceability. These connectivity options make the device a future-proof solution for building automation, home automation, and industrial applications.

Data Logging and Time Management

The Web-IO 4.0 Digital features an integrated data logger that records switching events and state changes. Storage capacity ranges from a minimum of 7 weeks to a maximum of 20 years, depending on the selected logging interval (15 seconds to 1 hour). Data can be exported via FTP, Excel files, or e‑mail attachments, facilitating further processing. An internal battery-backed clock ensures precise timestamps, further optimized by synchronization with a time server. These features guarantee reliable documentation and analysis of switching events, beneficial for process monitoring and machine data collection.

Wide Range of Applications

The Web-IO 4.0 Digital is designed for a broad spectrum of applications. In remote monitoring and fault reporting, it monitors switching inputs to detect and report system faults. In building automation, it controls devices like lighting, gates, or barriers and enables cross-site switching. In home automation, it supports automation of lighting or heating systems to enhance comfort and energy efficiency. In industrial environments, the device is suitable for process monitoring and visualization, as well as machine data capture (MDE), to optimize production processes. Pulse counters on the inputs enable event tracking such as production cycles or flow rates. Other use cases include barrier or access control systems.

Flexible Power Supply and Standards Compliance

The Web-IO 4.0 Digital can be powered via Power-over-Ethernet (PoE) using phantom power through data pairs or unused wire pairs, or via an external 12–48 V DC supply via screw terminal. This flexibility allows deployment in environments with or without PoE infrastructure. The device is standards-compliant for office and industrial use, with high immunity to interference (EN 61000‑6‑2) and low emissions (EN 55032:2015 + A1 Class B, EN 61000‑3‑2, EN 61000‑3‑3). These features ensure reliable and interference-free operation, even in demanding environments.

Please note: No power supply is included.

Durability and Reliability

The Web-IO 4.0 Digital is designed for continuous operation and comes with a five-year warranty. Its robust build and DIN rail mountability make it ideal for industrial environments. The internal, battery-buffered clock ensures precise timekeeping, further enhanced by synchronization with a time server. These features underscore the device’s durability and reliability, even under challenging conditions.

An Indispensable Tool for Control and Monitoring

The Web-IO 4.0 Digital 2× In, 2× Relay Out from Wiesemann & Theis is a versatile solution for relay control and remote monitoring in networked environments. With its two switching inputs, two potential-free relay outputs, and extensive network capabilities, it offers a flexible solution for building automation, home automation, process monitoring, and machine data acquisition.

Support for modern protocols like OPC UA, MQTT, and REST, along with the intuitive web interface, make it ideal for Industry 4.0 requirements. Whether for controlling lights, gates, or barriers, monitoring sensors, or logging switching events, this device is an indispensable tool for professional users.