What is the main function of a process historian?

The main function of a process historian is to record and store process data over time. This involves collecting a wide range of data from various sensors and instruments used in industrial processes and then maintaining that information in a time-stamped format. By doing so, the process historian enables engineers and operators to analyze historical data trends, improve process efficiency, conduct performance assessments, and comply with regulatory requirements.

Data retention is crucial for troubleshooting, process optimization, and ensuring that operations align with desired performance standards. Moreover, having a comprehensive historical database allows organizations to make informed decisions based on past performance and patterns, which is vital for continuous improvement and operational excellence in industrial settings.

In contrast, controlling real-time processes is typically the job of a Distributed Control System (DCS) or a Programmable Logic Controller (PLC), while visualizing system diagrams pertains more to the user interfaces provided by control systems or monitoring software. Managing safety protocols involves safety management systems or compliance programs and is not the primary responsibility of a process historian.