In an increasingly networked industrial and building environment, digital interfaces for remote control and process monitoring are becoming ever more important. The Wiesemann & Theis Web‑IO 4.0 Digital (2x In, 2x Out) enables precise control and monitoring of switching signals via Ethernet networks – from machine automation to intelligent building technology. By combining two digital inputs and two robust outputs in 24 V technology, this device offers a powerful and flexible solution for a wide range of Industry 4.0 and Internet of Things (IoT) applications.

The Web‑IO 4.0 system defines the next generation of decentralized network connectivity through its modular architecture, powerful communication via OPC UA, MQTT, and REST, and an intuitive, web-based interface. It enables automated signal acquisition and processing, is future-proof for integration into digital infrastructures, and is characterized by maximum operational reliability and long-term stability.

Digital Precision – 2 Inputs and 2 Outputs in Detail

The Web‑IO 4.0 Digital has two digital inputs and two digital outputs designed for 24 V industrial architecture.

• Digital inputs (2x In): The inputs use 24 V technology and feature integrated 32-bit pulse counters. They register switching operations or pulse events in real time – for example, from push buttons, sensors, or pulse encoders. This enables precise acquisition of process signals in machine data collection (MDE) and process control.
• Digital outputs (2x Out): The outputs also operate on a 24 V basis and can drive currents up to 500 mA per channel. They are short-circuit proof and allow direct control of signal devices, relays, or other loads. Switching circuits up to 230 V can be controlled via coupling relays.

With this configuration, the Web‑IO 4.0 combines two critical functions: precise signal acquisition and powerful actuator control. This makes it a core module for remote monitoring, building automation, or machine control. Whether gates, barriers, lighting systems, or production units are controlled – the logged interaction between inputs and outputs allows complete transparency and control.

User-Friendly Web Interface and Mobile Control

With its integrated web interface, the Web‑IO Digital 4.0 enables intuitive, graphically supported control via browser. The user interface is available in two languages (German / English) and optimized for desktop and mobile devices. Switching inputs and outputs can be directly monitored and controlled – even remotely via smartphone or tablet.

Secure HTTP and HTTPS connections allow admins and operators to check the status of digital ports in real time. The operating interfaces provide live visualizations of current signals and counter values, while status changes are immediately forwarded to connected systems. The high responsiveness of the web server enables near real-time control across the entire network. Data can be easily integrated into other web applications or dashboards using AJAX or JavaScript.

Automated Alerting and Signal Notification

For critical system monitoring, the Web‑IO offers powerful alarm and automation functions. Up to 30 actions can be defined to automatically respond to events on the inputs or outputs. Possible events include signal changes, counter thresholds, or communication timeouts.

The available actions include:

• Sending email notifications on signal change
• Triggering SNMP traps (v1, v2c, or v3)
• Switching local or remote Web‑IO outputs
• HTTP request commands for integration with third-party systems
• Logging status changes to Syslog servers

Alerts can be configured via the integrated mail server or standardized protocols. This function is especially valuable for fault monitoring, facility management, and industrial process chains where response times are critical.

Seamless Integration into Industry 4.0 and IoT Environments

For dynamic networks and future-proof automation, the Web‑IO 4.0 supports a wide range of industrial standards and IoT protocols:

• OPC UA – Standardized, platform-independent communication for manufacturing control and SCADA systems.
• MQTT (Secure) – Cloud-enabled protocol for IoT applications and building monitoring.
• REST API – Easy data retrieval for custom web applications and graphic evaluation.
• Modbus TCP – Integration with existing industrial automation infrastructures.
• SNMP (v1, v2c, v3) – Network management protocols for remote maintenance and monitoring.
• Syslog and Sensobase via ODBC – Integration into monitoring and reporting servers.

Developers can access input/output data individually via TCP or UDP sockets (C/S mode). This allows the device to be used as a central component in databases, control systems, or IoT platforms. Integrated FTP support also enables complete signal logging for documentation and compliance.

Data Storage and Precise Time Management

The integrated logging system documents every status change with a timestamp and event description. Depending on the chosen logging frequency, measurement and switching events can be stored for periods ranging from 7 weeks to 20 years. Export options include formats such as Excel, CSV, or automatic FTP upload.

A battery-buffered clock ensures an almost perfect time base and can optionally synchronize with an NTP server. This ensures that all event data is precisely time-stamped – essential for audits, quality assurance, and MDE systems.

Technical Specifications

• Inputs: 2 x Digital 24 VDC with 32-bit pulse counter
• Outputs: 2 x Digital 24 VDC, 500 mA current-driving, short-circuit proof
• Operating voltage: PoE (802.3af) or 12–48 VDC external
• Communication protocols: OPC UA, MQTT, REST, Modbus, SNMP (V1/V2/V3)
• Alarm options: Up to 30 configurable event actions
• Storage logger: 15 s–1 h interval, log retention 7 weeks to 20 years
• Interfaces: TCP, UDP, HTTP/S, FTP
• Protection: EMC-compliant according to EN 61000‑6‑2 and EN 55032 Class B
• Mounting: DIN rail or external panel

Application Areas

• Remote monitoring and fault reporting systems: Detection of switching states to ensure operation and failure analysis.
• Building automation: Control of lighting, gate, or access systems via LAN or Internet.
• Industrial process control: State monitoring and control of machinery and conveyor systems.
• Home automation: Integration into smart home installations for lighting and climate control.
• Machine data collection (MDE): Analysis of production cycles and performance data via pulse counters.
• Quality and energy monitoring: Data acquisition for audit reports or optimization of operational processes.

Power Supply and Reliability

For flexible installation, the Web‑IO 4.0 Digital can be powered via Power over Ethernet (PoE). This transmits both data signals and power over the same cable, greatly reducing cabling and installation effort. Alternatively, a connection for external DC power supply (12–48 VDC) is available. EMC-tested electronics and short-circuit-proof outputs ensure trouble-free 24/7 operation – even in critical industrial environments.

Durability and Support Quality

With a 5-year warranty, Wiesemann & Theis stands for German engineering quality and long-term stability. The industrial device is low-maintenance, temperature-resistant, and mechanically robust. It can be integrated into existing control cabinets via DIN-rail mounting, simplifying use in IT, automation, and control environments.

Networked Control with Digital Intelligence

The Wiesemann & Theis Web‑IO 4.0 Digital 2x In, 2x Out is a future-proof control and monitoring solution for networked applications in industry, building, and home automation. Its robust switching electronics, extensive protocol support, and integrated data logger make it a key element of digital infrastructure. From machine data collection to process-driven signal forwarding to cloud integration, the Web‑IO 4.0 offers a secure foundation for efficient, energy-optimized, and intelligent monitoring – made in Germany.