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{{Unreferenced|date=December 2009}}
A '''process automation''' or '''automation system''' (PAS) is used to automatically control a process such as chemical, oil refineries, paper and [[wood pulp|pulp]] factories.
The PAS often uses a network to interconnect sensors, controllers, operator terminals and actuators.
A PAS is often based on open standards in contrast to a DCS ([[distributed control system]]), which is traditionally proprietary.
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