The use of a digital computer to read dependant variables, and establish commands to the final control elements of multiple regulatory loops. While common in the early days of digital process control, DDC using large central computers is increasingly being replaced by DCS and SCADA control strategies.
Use of a digital computer to perform required automatic control operations.
A computer control technique that sets the final control element's position directly by the computer output.
A type of control where controlled and monitored analog or binary data (e.g., temperature, contact closures) are converted to digital format for manipulation and calculations by a digital computer or microprocessor, then converted back to analog or binary form to control physical devices.
System control performed by electronic microprocessor-based controllers that use digital signals for monitoring analog sensor inputs and controlling analog actuator outputs.
A control loop in which data are updated periodically through a set of given control algorithms.
Direct Digital Control refers to the ability to control HVAC devices via programming.