PLC (Programmable Logic Controller)
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Last download on: Fri Feb 17, 2017 01:03:49 AM
PLC’s were developed in the late 1960’s to eliminate the large cost involved in changing complicated relay based machine control systems. These systems were inflexible. Their major rewiring or complete replacement was nec-essary every time when the production requirements changed and control sequences had to be modified. It became very expensive when changes were frequent. The idea to replace relay systems with flexible microproces-sor based Programmable logic controllers PLC’s was a revolutionary step in the industrial control business
The design and implementation of a classical control system laboratory based on PLC control system is introduced in this paper. To design and implement the system, two parts must be produced. The first is software for PLC and the sec-ond is hardware for experiments related to the programs. The PLC control system used in the design is LS industrial system company GM7-DR40A 24/16 Digital I/O and single Analog I/O module, two photoelectric sensors from Atonic company’: the first with the model BR100-DDT-P, and the second BEN10M-TFR. An approximate sensor with 5-sides is detected, four of CMOS BCD-7-Segment driven by CD4511B, two relays: 2-poles and 3-poles, six voltages and an ammeter measurement, DC motor and 24 VDC power supply and many connecters and pinions. Satisfactory results are obtained by executing twenty four experiments for classical control theory that fulfill the requirements of control theory in undergraduate stage and replace the old experiments executed by PID controller where the practice system is imple-mented by PLC control now.
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"Design and Implement of a Programmable Logic Controller PLC for Classical Control Laboratory"
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