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Programmable logic controllers (PLCs), programmable automation controllers (PACs), distributed control systems (DCSs) and remote telemetry units (RTUs), and user interfaces such as operator interface terminals (OITs) and HMIs used in the monitoring of the process, site, or system are listed and their functions are described. This information can also be presented as a control system architecture drawing.

Control, data handling, and presentation systems such as supervisory control servers, historians (and associated trending and reporting packages), alarm escalation systems, and performance management systems should be included to establish the extent of process data management and how staff will interact with the process and receive data. Development of data integration and connections external to the control system (reporting, remote monitoring, and alarms escalation) should be implemented following the practices identified in Chapter 12.