Open Automation Software
Moving Data From Anywhere to Anywhere

Modbus IoT Data Historian
Log Modbus Data to SQL Server, Oracle, mySQL
Azure SQL, Access, mySQL, and CSV Files


Everything you need to build world-class SCADA, HMI, .NET, and Web Applications quickly. Without touching a line of code!




  • Modbus TCP over Ethernet
  • Modbus RTU over Ethernet
  • Modbus ASCII over Ethernet
  • Modbus TCP over Serial
  • Modbus RTU over Serial
  • Modbus ASCII over Serial
  • Optional Enron addressing

Hard disk and database icon isolated on white background


Data Logging Types:

  • Continuous: Log continuously as fast as 100 nanoseconds.
  • Event Driven: Log one record based on trigger.
  • Data Change: Log a record for each value change.
  • Snapshot: Go back in time to record data prior to an event.
  • Time of Day: Log one record at a specific time each day.

Store and Forward:

No data loss on network failure or database fault.

100 Nanosecond Resolution:

Unique data handling of data from controller buffer to record values as fast as the controller can process values.

Open Format:

Data is logged to databases in an open format to access directly from any third party reporting system.

Log data to SQL Server, Oracle, Access, mySQL, Azure SQL, and CSV files.

Scalable Big Data:

  • Log 1 to 1,000,000 data points from each server
  • Log data from up to 10,000 servers to central data server
  • Log to more than 10,000 tables from each server
  • Log all local and remote tags into one common table

Automated Setup:

Utilize One Click Database to automatically setup logging of all data from the controller.

Or utilize programmatic setup of Tags and Data Logging with a .NET application.

Edge Computing with OAS Distributed Network Architecture

Cost-effective Licensing

OAS licensing is based on three simple factors:

  1. The number of tags you need to connect to
  2. The number of OAS products needed to connect your data sources
  3. Whether you need a networked or stand-alone system

You can deploy unlimited client applications for each Distributed Network Architecture enabled server.

Stand Alone systems
start at
Networked unlimited user systems
start at


Data Historian Videos

Setup Data Logging

How to setup Data Logging Groups for Continuous, Event, Data Change, and Snapshot recording. Refer to One Click Database above to automate the setup.

One Click Database

Automatically setup data logging to SQL Server of all data from Kepware OPC Server in one step.

Data Buffering

How to setup data logging so there is no data loss on a network or database engine failure.

Data Historian Features

10 Things Your Data Historian Should Do
How to implement OAS Data Logging automated features for local and networked data logging.

OAS Introduction

OAS Introduction

Introduction to Open Automation Software. IoT / SCADA / HMI software for .NET, web, and Big Data.

OAS IoT Software

Overview of IoT software products by Open Automation Software.

IIoT Software with Edge Computing Distributed Network Architecture

Connect Data Sources

Make virtually limitless connections from a huge range of data sources with OAS Universal Data Connector feature.

Universal Data Connector

Move Data

Move data quickly and securely and in an open format using our innovative Distributed Network Architecture.

Distributed Network Architecture

Create Applications

Create powerful .NET, web and cross-platform mobile HMI applications. Access OAS data from anywhere and from any device.

Application Development