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Reference.org
Hierarchical control system
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<p>A hierarchical control system (HCS) is a form of <a href="/facts/Control_system/8CEjIDlS">control system</a> in which a set of devices and governing software is arranged in a <a href="/facts/Hierarchical/mYJyqFrG">hierarchical</a> <a href="/facts/Tree_(data_structure)/RcXz9noF">tree</a>. When the links in the tree are implemented by a <a href="/facts/Computer_network/3w5RM99p">computer network</a>, then that hierarchical control system is also a form of <a href="/facts/Networked_control_system/4zGuQHT0">networked control system</a>. </p>