(435) 750-5999
X-408 Web-Enabled 8 Digital Input Module | ControlByWeb
5 Year Warranty

X-408 features 8 digital inputs and a built-in web-server.

Industrial Digital Input Monitoring

Web Enabled

Monitor 8 digital inputs using a standard web browser.

Web Enabled

Read input states from Modbus master devices.

Configurable inputs

Configure an input for discrete, counter, or frequency measurement.


Share real-time input states with other ControlByWeb devices.

Logging and Graphing

Log and graph digital input states over time.

Email/Text Alerts

Customizable email/text alerts based on input states.

I/O Mirroring

Mirror the state of the inputs' to relays on remote devices.

Other 400-Series Features

Task Builder, encryption, intuitive user interface, much more.

Applications - Industrial Internet of Things (IIoT)

The X-408 is ideal for applications that require discrete input monitoring over an IP network.

Discrete Input Monitoring

Use the X-408 to detect the state of buttons and switches. Send the state of the inputs to other 400 Series controllers (X-400, X-410, etc.) for real-time control.


Monitor the on/off state of push buttons and switches. Using peer-to-peer (P2P) communication, the module can be logically linked to I/O on remote modules (WebRelay, X-410, etc.) to control a variety of devices like a door locks, or lights.

Water Sensors, Float Switches, etc

Connect water sensors, float switches, etc. Configure the X-408 to send email/text alerts when the sensor is tripped.

Security Sensors

Monitor security sensors such as magnetic door/window sensors, motion sensors, loop detectors, and more. Configure the X-408 to send email/text alerts when sensors are activated during specified times.

Process Monitoring

Use the X-408 to monitor photo-detectors, limit switches, counters, etc. in manufacturing processes.

Flow Measurement

Connect flow sensors to the X-408 and configure its control page to display flow in gpm, lpm, etc., in real time.

X-408 connects to many different sensors

The X-408 can be connected to many different types of sensors

I/O Mirroring

The X-408 can be used in a larger, distributed system. The following illustration shows how the X-408 works in conjunction with other ControlByWeb products for I/O mirroring.

Contact-closure sensor states connected to the X-408 are mirrored to the relay contacts on the WebRelay-Quad which are connected to a PLC's inputs


  • Eight optically-isolated digital inputs
  • Each input can be configured as:
    • Discrete On/Off
    • Counters
    • Frequency measurements
  • Monitor, log, and control 32 remote modules, or up to 100 I/O
  • User Permissions: Admin, Manager, User
  • Tasks
    • 50 Scheduled
    • 50 Conditional
    • 20 Override Schedules
  • Send email alerts based on user-defined conditions (supports encrypted email servers, such as Gmail)
  • Real-Time Clock with NTP server synchronization
  • Automatic daylight savings and leap year adjustment
  • No software required
  • Customizable web-based Control Page
  • BASIC script support for advanced flexibility
  • Configurable logging
  • Graphing (logged data)
  • HTTPS/TLS encrypted
  • Static or DHCP IP address configuration
  • Modbus, SNMP, Remote Service, IP Filtering
  • Field updatable
  • Removable 14-Terminal connector for easy installation
  • Rugged DIN-Rail/wall-mountable enclosure
CE listed RoHS compliant Made in the USA

X-408 Part Numbers (Differences highlighted in green)

X-408-I Digital: 8 (4-26VDC) Task builder, email daily log file, add 100 I/O on up to 32 Remote I/O Modules 9-28 VDC
X-408-E Digital: 8 (4-26VDC) Task builder, email daily log file, add 100 I/O on up to 32 Remote I/O Modules POE and/or 9-28 VDC

More Information:


Where to Buy

Click "Buy Online" to view part numbers and pricing. X-408 is available in the USA and internationally, and can be purchased either from us or an Authorized Distributor.

Related Products

Inputs & Relays


4 Inputs, 4 Relays, 1-Wire Bus: Up to 16 temp sensors

Learn More

Expandable I/O


Expandable - Up to 100 I/O

Learn More

More Digital Inputs

X-15s (used with the X-400)

Eight, Optically-Isolated Digital Inputs

Learn More

Warning: May contain chemicals, including Nickel (metallic), known to the State of California to cause cancer and reproductive harm. -