Direct digital control usually refers to a system in which a digital device such as a computer automatically controls some process based on certain conditions. There are many applications for direct digital control, many of which are related to building automation or HVAC systems. In general, these kinds of systems include multiple components that are controlled from some central location.
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To accomplish whatever task the system has been created to maintain, it might rely on collecting and processing data before changing conditions or attempting to meet certain specifications. For instance, a direct digital control system meant to monitor and maintain a certain temperature and air pressure within a building can monitor various factors.
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Should the temperature drop below acceptable levels, direct digital control systems can make the proper adjustments, whether those adjustments involve turning on more radiators or encouraging air circulation by turning on an array of fans and air ducts.
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Many safety systems can also benefit from the technologies offered by direct digital control. For instance, a safety instrumented system might monitor the wellhead pressure of an oil well and take action if the pressure of that well exceeds what is considered safe. This type of application shows the benefit to this type of control, because a system build to monitor safety may be able to detect malfunctions long before human intervention is possible. Much like industrial control systems, this type of control may be essential to high-risk jobs such as drilling and extracting oil.
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