X-420™ | Instrumentation-Grade Data Acquisition


The X-420™ features software-programmable digital I/O that can be assigned as an input or an output.

4 Analog Inputs

2 Digital I/O

Up to 16 Temperature Sensors

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  • 30-day return policy
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X-420 Overview

The X-420 offers the flexibility of configurable digital I/O, plus four analog inputs. It’s a good fit for applications like boiler room, generator, and greenhouse monitoring.

X-420 Features

  • Customizable Web Dashboard
  • No-Code Logic Builder
  • Peer-to-Peer Networking
  • Robust Data Logging
  • 400 Series Platform

X-420 Applications

  • Pump Control
  • Fluid Level Monitoring
  • Temp & Humidity Monitoring
Integration Icon

Integration Ready

We support HTTP GET, XML, JSON, SNMP, Modbus TCP/IP, and our Cloud API with more on the way.

No-Code Logic Icon

No-Code Programmable Logic

Our intuitive Task Builder empowers you to build custom logic using drop-down menus in an if-this-then-that flow.

Peer-to-Peer Icon

P2P Networking & Remote I/O

Devices can communicate through Peer-to-Peer (P2P) networking to share I/O among other ControlByWeb controllers, assign any device as master, set up multiple masters, and link remote inputs and relay control.

Email Notifications Icon

Email Notifications

Stay in control of operations with real-time monitoring. Add intelligence to your emails through programmable logic to instantly send notifications to the right people and eliminate false alarms.

Built-In Firmware Icon

Easy-to-Use Embedded UI

Our devices come with a simple embedded user interface that will enable you to easily monitor, manage, and control ControlByWeb PLCs from any standard web browser.

Data Logging Icon

Data Logging

Enjoy scheduled and conditional logging with email and FTP log exports. Add the optional ControlByWeb Cloud for remote access and downloadable logs.

Cloud Compatible Icon

Cloud Compatible

Enhance your capabilities with the ControlByWeb Cloud. Gain enhanced features such as simplified remote device access, data logging, and advanced analytics.

Security Icon

Trusted Device Security

Our controllers have no built-in OS or file system, making them less prone to vulnerabilities. Third-party consultants and government agencies test the cybersecurity of our controllers.

IIoT Icon

IIoT Monitoring & Control

Access the device directly through an assigned IP address. Set up your network settings the way you want, to limit or allow remote access through the cloud.

X-420 Case Studies



  • X-420-I
  • X-420-E
Power Requirements
  • Voltage:
  • X-420-I: 9-28 VDC
  • X-420-E: POE and/or 9-28 VDC
  • Max Current: 175mA Max (2-Digital I/O=On, no 1-wire sensors. See users manual for typical values at 25°C)
Output Mode
  • Logic output to external controllers 5V high through 49.9 Ohm resistor
Digital Inputs
  • Number of Inputs: 2 (configurable)
  • Type: Non-Isolated
  • Voltage Range: 0-5VDC
  • Current: Switchable 47K Pullup/Pulldown
  • Vin Hi (Min):
  • Vin LO (Max):
  • Debounce: 0 to 250mS (configurable)
  • Minimum Hold Time: 1ms
  • Number of Counter Inputs: 0-2 (configurable)
  • Max Count Rate: 200Hz Max
  • Input Functions: Monitor State, Control Digital I/O, Control Remote Relays, Scalable Counter, On Timer, Total On Timer, Frequency
  • Edge Trigger: Rising, Falling or Both
Frequency Input
  • Type: AC coupled, sine or square wave (works with millivolt magnetic wind speed sensors)
  • Max Input Voltage: ±12 VDC, 30Vpp AC
  • Hysteresis: 25mV
  • 0-20 kHz input frequency
  • Sine or Square Wave
  • 1 second average
  • Minimum input level:
Input Frequency Min Vin
Vin @ 1 Hz 50mVpp
Vin @ 10 Hz 50mVpp
Vin @ 100 Hz 60mVpp
Vin @ 1 kHz 80mVpp
Vin @ 10 kHz 700mVpp
Vin @ 20 kHz 1.7Vpp min
Analog Inputs
  • Number of Inputs: 4
  • Resolution: 16-bit, SAR
  • Type: Single-ended, differential, 4-20mA (0-20mA), or a combination
  • Input Range: ±1.28V, ±2.56V, ±5.12V, ±10.24V, 4-20mA
  • Max Input Voltage (Vin): -12.5V < Vin < +12.5V
  • Input Impedance (Zin): > 500Meg Ohm
  • Channel Off Leakage: ±0.6nA (typ)
  • Input Common Mode Rejection: >100dB
  • Total Unadjusted Error: -9LSB (min), +9LSB (max)
  • Voltage Reference Drift: ±5 ppm/°C
  • Internal 4-20mA input shunt: 200-ohm, ±0.1%, 25ppm (uses ±5.12V range)
  • Logging Rate: 25 Hz
Temperature Sensors
  • Maximum Number of Sensors: 16
  • Type: Digital 1-Wire (Maxim Semiconductor DS18B20)
  • Temperature Range: -67°F to 257°F (-55°C to +125°C)
  • Accuracy: ±0.5°C (from -10°C to +85°C)
  • Sensor Functions: Monitor Temperature, Control Digital I/O, Control Remote Relays, Log Temperature, Email Alerts
  • Humidity Type: Xytronix Model X-DTHS-P sensor
  • Humidity Range: 0-100% RH
  • Accuracy: ±2%
  • Max Cable Length: 600 feet (180m) maximum combined cable length
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, 2 Digital I/O
  • Backup Duration: 2 week minimum
  • Type: 10/100 Base-T Ethernet Port
  • Setup: Static or DHCP IP address configuration
  • Power, Outputs, and Inputs: 14-Position, 3.81mm terminal spacing, Removable. For 16-28 AWG wire.
  • Network: 8-pin RJ-45
LED Indicators
  • Number of LEDs: 5
    • Power on
    • I/O (1-2)
    • 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 g)
  • 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: 3,072K (up to 50,688 log entries depending on configuration)
    • Storage: Nonvolatile Flash
    • Buffer Architecture: Circular Buffer

Log data can be periodically read and stored on a computer

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-420-I: FCC 47CFR15 (Class B)
  • X-420-E: FCC 47CFR15 (Class A)
Product Safety Compliance
  • IEC 61010-1

Manuals & Downloads




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For your convenience we have set up a live X-420 unit for testing and evaluation. By clicking the links below you have full access to this live unit. You can make changes to the configuration and settings through the setup pages and you can control X-420 through its control page. The control page allows you to change the state of the relay and view the current state of the input.


Control Page Setup Pages*

*Setup page login information:

Username: admin

Password: webrelay

X-420 live demonstration setup

Live Demo With One of Our Sales Engineers

Let’s make it easy with a live demo and screen sharing.

Set up a one-on-one Q & A with one of our experts. We’ll help you find the best solutions for your next project and walk you through a demonstration.

Low on time? Watch a pre-recorded demo instead:

400 Series Setup and Programming Demo

X-420 Setup

The diagram illustrates how this demonstration is wired. Nothing is connected to the relay contacts; however, you can still turn the relay on and off to see how it works. The input state only changes when a voltage is applied to the input. For this demonstration, we have connected one of our X-332 controllers to the input of the X-420. You can apply a voltage to the input of the X-420 by accessing the control page for the X-332 (Digital Input Control Page).

Important Information

  • Multiple users may be accessing this device simultaneously so the device can change while you are using it.
  • This unit will be reset to factory defaults daily at 2:30AM MST.
  • Please DO NOT change network or password settings.

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