Web Alarm

Display real time and historical alarms in an interactive table, viewable on any device with a web browser.
Log alarms to databases and send alarm notifications via email, SMS text, and voice message.

Key Features of Web Alarm

The OAS Web Alarm product allows you to display real time and historical alarms in an interactive table, viewable on any device with a web browser.


By utilizing standard, platform-agnostic technologies such as HTML5, CSS, Javascript, JQuery, and JSON, web developers can create useful operator dashboards for managing system alarms.

  • Compatible with ALL browsers on Mac, PC, Linux, and mobile devices capable of displaying HTML5 and executing JavaScript, including: Chrome, Firefox, Safari, Internet Explorer (8+, 9+ recommended), Mobile Safari and Chrome on iOS, Mobile browsers on Android
  • Utilizes open standards for HTML5, JavaScript, and CSS
  • Unique markup option quickly adds live data to existing HTML pages
  • Programmatic JS interface allows for advanced application UI development
  • Can run on ANY web application platform that generates or delivers HTML includingASP.NET and .NET MVC, PHP, Ruby on Rails, NodeJS, Static HTML sites like WordPress …and more!
  • Supports authentication and secure communications over SSL
  • Requires no plugins, Java applets, or ActiveX controls to execute; just point your browser to your web application to start
  • Requires no compilation or packaging for deployment; supports file copy deployment or integration with your own deployment methods
  • Real time data delivered directly to your browser, reducing load on your web application server

Platform Components

Universal Data Connector

The core of the OAS Platform, enabling data connectivity, server-to-server networking, and more

Data Historian

Log data in open format to MS SQL Server, Oracle, mySQL, PostgreSQL, Cassandra, MongoDB, SQLite, MariaDB, Access, SQL Azure, and CSV

Alarm Logging & Notification

Log events to open databases, and send notifications via SMS, email, and voicemail

Device & Data Connectors

Read and write data to Allen Bradley, Siemens, and Modbus devices, Universal Drivers, OPC, and OPC UA, open databases, and Excel

IoT Connectors

Connect to cloud-base IoT gateways such as AWS, Azure IoT, and MQTT Brokers

Developer Tools & APIs

Develop custom Visualizations, User Interfaces, and Automation apps for Windows, web, native iOS and Android, integrate with .NET and REST APIs

Networking Features

Provides the most robust, scalable, and reliable distributed networking platform for IIoT solutions

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Alarm Logging

Includes Alarm Logging to SQL Server, Oracle, Access, mySQL, SQL Azure, PostgreSQL, Cassandra, MongoDB, and CSV files.

Alarm Notification

  • Email
  • SMS Text Message
  • Voice Recording

Alarm Summary

Keep track of how long alarms or groups of alarms are active and how many alarms within a group or system are currently active, not acknowledged, or cleared.  Escalate alarms to the next level of supervision any number of times.

Live Demo


Live example at www.opcweb.com
Getting started with Web Alarm is as simple as including the Javascript reference libraries on a web page along with some small code snippets to configure the alarm viewer.
By utilizing standard web technologies, Web Alarm supports user interface development on any web platform such as ASP.NET, .NET MVC, PHP, Ruby on Rails, Java, and more.
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Web Alarm is also available as a Module within the Web HMI Dashboard

Built upon Web HMI, the Web HMI Dashboard allows you to quickly and securely visualize your data within a browser interface. Features include:

  • Give you access to real time and historical data on any device using a web browser
    • Desktop PCs
    • Mobile devices
  • Provides secure access to your data in any browser
  • Modular design includes components for visualizing:
    • Numeric data in radial gauges 
    • Boolean data as interactive switches 
    • Live, raw tag data in tabular format 
    • Real time and historical Alarms 
    • Real time and historical Trends 
    • Your own custom views and external web pages 

Learn more about Web HMI Dashboard


Download and start a free, unlimited trial, or schedule a live, interactive demo