Web-Enabled Digital Input Module

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

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


Power Requirements

  • Voltage:
    • X-408-I: 9-28 VDC
    • X-408-E: POE and/or 9-28 VDC
  • Max Current: 240mA

Digital Inputs

  • Number of Inputs: 8
  • Type: Optically-Isolated
  • Voltage Range: 4-26VDC
  • Current: 950uA @ 4V, 8.5mA @ 26V
  • Minimum Hold Time: 20ms
  • Input Functions: Monitor State, Control Relays, Control Remote Relays, Scalable Counter, On Timer, Total On Timer, Frequency
  • Maximum Count: 24-bit
  • Max Count Rate: 200Hz Max (Dependent on Configuration)
  • Edge Trigger: Rising, Falling or Both

Real-Time Clock:

  • Manual or NTP(Network Time Protocol) setup
  • NTP Sync Period: Once, Daily, Weekly, On Powerup
  • Auto Daylight Savings Adjustment
  • Battery (capacitor) Power Backup

Capacitor Power Backup

  • Backup Functions: Retain Real-Time Clock, 1 Register, 2 Counters, 4 Relay States
  • Backup Duration: 2 week minimum


  • Type: 10/100 Base-T Ethernet Port
  • Setup: Static or DHCP IP address configuration


  • Power and Inputs: 14-Position, 3.81mm terminal spacing, Removable. For 16-28 AWG wire.
  • Network: 8-pin RJ-45

LED Indicators

  • Number of LEDs: 11
    • Power on
    • Digital Inputs 1-8
    • Network linked
    • Network activity


  • Operating Temperature: -40°F to 150°F (-40°C to 65.5°C)
  • Size:
    • 1.41in (35.7mm) wide
    • 3.88in (98.5mm) tall
    • 3.1in (78mm) deep (not including connector)
  • Weight: 5 oz (142 grams)
  • Enclosure Material: Lexan 940 Polycarbonate Plastic
  • Enclosure Flame Rating: UL94 V0


  • HTTP, HTTPS, SSL, XML, Modbus TCP/IP, SNMP, SMTP, Remote Services


    • Log File Size: 512K (up to 8,448 logs)
    • Storage: Nonvolatile Flash
    • Buffer Architecture: Circular Buffer

Log data can be periodically stored on a computer via FTP or email.

Advanced Features

  • Task Builder
  • BASIC interpreter
  • Remote services

Password Settings

  • Password Length: 6-18 Characters

Electromagnetic Compliance

  • IEC CISPR 22, CISPR 24
  • EU EN55024, EN55022
  • X-408-I: FCC 47CFR15 (Class B)
  • X-408-E: FCC 47CFR15 (Class A)

Product Safety Compliance

  • UL 61010-1 (Electrical Equipment for Measurement, Control, and Laboratory Use)