
Flexible I/O to Monitor and Control
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
- See more applications
Application Spotlight: Boiler Monitoring
ControlByWeb® products can help you with your boiler monitoring system and avoid potential, costly damage. Remotely monitor temperature, pressure, and water leaks for industrial/commercial boilers.
Connect any ControlByWeb temperature monitoring device to a local area network to access the built-in control and setup web pages using a standard web browser. No additional software or cloud services are needed.
In this example, an X-420™ controller is connected to three sensors to monitor the pressure and temperature of an industrial boiler, as well as to detect water leaks.
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Powerful 400 Series Features

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

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.

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
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.

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

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

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 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.