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Reference.org
Process control network
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<p>A Process Control Network (PCN) is a communications <a href="/facts/Telecommunications_network/NFCX0STS">network</a> layer that is a part of the Industrial Automation networks in Process Industries. This network is used to transmit instructions and data between control and measurement units and Supervisory Control and Data Acquisition (<a href="/facts/SCADA/nKL6Mfd1">SCADA</a>) equipment. </p>