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A PLC or programmable controller is a computer based solid state device that controls industrial equipment and processes. Initially designed to perform the logic functions executed by relays, drum switches and mechanical timer/counters, it has been extended to analog control as well. A typical PLC system consists of a processor and an input/output system all mounted in a rack like system. The PLC system is a cost effective solution for applications with a high ratio of digital to analog points in a system. There are numerous third party vendors supplying software packages that allow the PLC to be interfaced to a PC based operator interface package | bookboon.com Process Control Automation Instrumentation and SCADA IDC Technologies Download free books at bookboon.com IDC Technologies Process Control Automation Instrumentation and SCADA Download free ebooks at bookboon.com 2 Process Control Automation Instrumentation and SCADA 2012 IDC Technologies Ventus Publishing ApS ISBN 978-87-403-0056-7 Download free ebooks at bookboon.com
