W&T connects
Interfaces for TCP/IP, Ethernet, RS-232, RS-485, USB, 20mA, glass and plastic fiber optic cable, http, SNMP, OPC, Modbus TCP, I/O digital, I/O analog, ISA, PCI
Data sheet:

Web-IO 4.0 Digital Logger 16xIn/Out

Switch, monitor, count and time stamp ...

With the Web-IO 4.0 Digital Logger you can control, monitor and time stamp switching signals over TCP/IP-Ethernet. The 16 switching channels can be optionally used as input or output. All changes to the inputs and outputs are counted and stored in chronological order. The signal history can be viewed directly in the browser or downloaded as a CSV file.


Switching signals:

  • 16 channels:
    • Can be used optionally as inputs or outputs
    • 24V technology
    • Switching currents up to 500mA
    • 32-bit pulse counter

Data Logger:

  • Internal data logger:
    • Store up to 1,000,000 events with time stamp
    • minimum storing interval: 100 ms
    • maximum counts per second: 500
  • Logger evaluation in the browser:
    • in any Web browser without additional plug-ins
    • Switching events displayed in table format
    • Export any data logger time windows into CSV files
  • Internal clock:
    • Time synchronization via time server calibration
    • Battery-backed device clock


  • Intuitive Web interface for simpler operation
    • Select between German or English
    • Switching the outputs directly from the Web interface
    • Adaptation for smartphone
    • HTTP and HTTPS
  • Current Industry 4.0 protocols:
    • REST and MQTT support
    • AMQP on request
  • Box-to-Box
    • Pass switching signals over the network 1:1
  • Actions / alarm and reporting functions:
    • Email for alarm sending or as status report
    • SNMP polling / alarm traps
    • Switching your outputs in alarm situations
    • Switching the outputs on another Web-IO
    • HTTP requests for controlling third-party devices
    • Up to 30 actions can be configured
  • Dynamic integration into other Web sites:
    • Direct access to current states via HTTP requests, AJAX and JavaScript
  • Additional software interfaces for incorporating into your systems/databases:
    • OPC DA
    • OPC UA
    • Modbus TCP
    • Syslog
    • TCP and UDP sockets, client and server
    • FTP (data logging)
  • Internal clock
    • Time synchronization via time server calibration
    • Battery-backed device clock
  • Possible applications:
    • Remote monitoring and fault messaging
    • Cross-location switching
    • House and building automation
    • Process monitoring and visualization
    • Light, gate and cabinet control
    • Machine Data Collection (MDC)
    • More uses can be found here.

Power supply:

  • External power
    • Screw terminal
    • 12 - 24V DC

Standards & more

  • Conforms to standards both in office and industrial environments:
    • High noise resistance per EN 61000-6-2
    • Low noise emission per EN 55032:2015 + A1 Cl. B, EN 61000-3-2 & EN 61000-3-3
  • 5 year guarantee

Technical data

Connections, displays and control elements:

Digital in-/outputs:   16 channels can be used as in- or outputs
    Output for 12-24V, max. 500mA
    max. total current 2x4A
    Using our coupling relays voltages of even up to
230V can be switched
  Input voltage +/-30V
  protected against reverse connection within this range
  Input switching threshold 8V +/- 1V
  "On" current = 2.2 mA
    integrated 32-bit pulse counter
Network:   10/100BaseT autosensing
Power supply:   12-24V DC (approx. 100mA@24V)
Galvanic isolation:   Digital in-/outputs - network: min. 1000 V
Connections:   3 x 12x screw terminal for IOs - plug-in
1 x 11x screw terminal for IOs - plug-in
1 x 4x screw terminal for supply - plug-in
1 x RJ45 for network
Indicators:   Status LEDs for network
  32 LEDs for digital states

Data transmission:

Protocols:   HTTP and HTTPS
  TCP and UDP sockets, client and server
  MQTT - Publish and Subscribe
  SNMP including traps
SMTP e-mail sending
  Modbus TCP
  Inventory keeping, group management
Response times:   Data and switching traffic: typically 12 ms

Housing and other data:

Housing:   Plastic housing for top hat rail installation
precise fit for sub-distribution systems
  90x116x56mm (LxWxH)
Enclosure rating:   IP20
Weight:   approx. 140 g
Storage temperature:   -25°C - 70°C
Operating temperature:   0°C - 60°C
Permissible relative humidity:   5..95% RH (non-condensing)
Scope of delivery:  

1 x Web-IO 4.0 Digital, 16xIn/Out
1 x Quick Guide
Power supply and other accessories can be
ordered separately


*Net unit price for
commercial users
  • Power supplies

    • Plug-in power supply, 24V / 500mA DC with Euro plug
    • 11021
    • 21.00€
    • Plug-in Power Supply, 24V / 750mA DC with Euro, US and UK plug
    • 11026
    • 38.00€
    • Power supply for DIN rail, 24V / 630mA DC
      (merchandise, 2-year manufacturer’s guarantee)
    • 11080
    • 33.00€
  • Coupling relay for up to 230V

    • 230V coupling relay - 1 x changeover
      for DIN rail mount
    • 57015
    • 22.00€
    • 230V coupling relay - 2 x changeover
      for DIN rail mount
    • 57016
    • 22.00€
  • Mechanical Accessories

    • 19" DIN rail
    • 58813
    • 21.00€
    • Wall mount housing, enclosure rating IP66 / IP67
    • 11120
    • 54.00€
  • Supplementary network products

    • Ethernet Switch Gigabit Industry, 4 Ports
    • 55614
    • 148.00€
    • Motherbox 3
    • 50504
    • 328.00€

* Our offering is intended only for commercial users. We will be happy to refer private end customers to trading partners through whom our products can be purchased.