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Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies. In those older PLC based systems, each zone was self-sufficient and contained all of the instrumentation and control elements needed to consider analog and digital inputs and then take actions according to rules.

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  • Direct digital control (DDC) is the automated control of a condition or process by a digital device (computer). DDC is considered by many to be a more modern, granular and responsive update to older HVAC control systems based upon PLC technologies. In those older PLC based systems, each zone was self-sufficient and contained all of the instrumentation and control elements needed to consider analog and digital inputs and then take actions according to rules.
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