A supervisory control and data acquisition (SCADA) system has been developed for three machines used for the thermal processing of materials: a hot wire cutter, an induction heater and a welding test stand. The cutter...
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A supervisory control and data acquisition (SCADA) system has been developed for three machines used for the thermal processing of materials: a hot wire cutter, an induction heater and a welding test stand. The cutter uses a transformer with adjustable voltage between 20 V and 32 V, and current of 8 A, measuring the temperature of the wire with thermal expansion. The heater uses a 24 V, 15 A sources, and a type K thermocouple embedded in the sample in order to measure temperature. In welding, a temperature control system was implemented for the sample using type K thermocouple and a cooling fan using a 12 V and 20 A sources. The SCADA system consists of a PLC and a PC with a graphical interface which serves to select the process to be worked on as it displays the thermal history of the monitored object. The supervisory system uses a PC with a 32-bit Windows 7 operating system and an OPC software package running on the academic LabVIEW platform. It was designed to use a single human-machine interface for different thermal processes. This paper describes the important components of the system, including its architecture, software development and performance testing.
A new cutter sorter control system "ASP-5000C" was developed consisting of a programmablelogic controller (PLC) of "CYSMAC CS1 Series", produced by Omron Field Engineering Corp. It substituted the...
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A new cutter sorter control system "ASP-5000C" was developed consisting of a programmablelogic controller (PLC) of "CYSMAC CS1 Series", produced by Omron Field Engineering Corp. It substituted the former cutting control system consisted of a single board computer for high speed operation and having restrictions in computer language, man-machine interface, computer communication, and customization. The new control system resolved such restrictions. The concept, outline, characteristics, functions, and prospects of the new system were discussed.
A method is suggested for transformation of arbitrary programmablelogic matrix (PLM) to such the PLM for which the easily constructed complete test for checking multiple faults exists. The transformation is carried o...
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A method is suggested for transformation of arbitrary programmablelogic matrix (PLM) to such the PLM for which the easily constructed complete test for checking multiple faults exists. The transformation is carried out by addition of some complementary inputs. The complete test length does not exceed double number of single faults. An experiment made on a set of practical examples (MCNC Benchmark, 91) shows that the suggested method for PLM with more 20 input requires, on average, 3.5% of the additional area.
System designers use CPLDs (complex programmablelogic devices) for logic integration and implementation of control logic. While in-system programming (ISP) provides the flexibility to respond to changing standards an...
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System designers use CPLDs (complex programmablelogic devices) for logic integration and implementation of control logic. While in-system programming (ISP) provides the flexibility to respond to changing standards and requirements and reduce time to market, their relatively high power consumption has precluded use in most portable electronic system designs. The latest generation of CPLDs from Lattice Semiconductors deliver a high performance CPLD solution at ultra low power levels.
Distributed control systems and computer aided manufacturing are a few of the contemporary factory automation tools of today. programmablelogic controller (PLC) manufacturers are offering both soft logic, and a choic...
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Distributed control systems and computer aided manufacturing are a few of the contemporary factory automation tools of today. programmablelogic controller (PLC) manufacturers are offering both soft logic, and a choice of platforms to run it on. PLCs application in the process industry is being further enhanced by process-based technology. Software tools are a vital component for today's PLC user. Hence, every major industry is reconstructing its plant layout to join the trend of emerging factory automation by connecting everything to the Internet.
Object Oriented technologies can be used to develop programmable logic controllers (PLC) software following the IEC-61131-3 standard. In this paper, we present a new paradigm for developing objects components for asse...
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Object Oriented technologies can be used to develop programmable logic controllers (PLC) software following the IEC-61131-3 standard. In this paper, we present a new paradigm for developing objects components for assembling PLC programs. It is based upon the physical objects and methods used for constructing the electrical control cabinets. Objects oriented features, like polymorphism, inheritance and generic programming, which are not supported in the standard, are implemented with new algorithms.
Traffic lights are commonly known as the stop light or stop-and-go lights used as a source of signaling device in junctions around the world. It is common to position traffic lights on a certain road intersections, pe...
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Traffic lights are commonly known as the stop light or stop-and-go lights used as a source of signaling device in junctions around the world. It is common to position traffic lights on a certain road intersections, pedestrian crossings and other locations to control competing flows of traffic in order to enhance the smoothness of traffic flow. Traffic lights have been installed in most cities around the world regardless of different standards set by the local authorities. Traffic light controllers is programmed to assign timely directions for road users by demand in the form of colors which is Red, Amber and Green. Even though traffic lights are known as the best device in controlling traffic flow for road users, yet accidents reported at the traffic junction is very common. There are 2 methods in controlling the traffic light system placed on a certain junction. The most common one is the sequencing method, whereby the traffic light system is designed to operate according to the preprogrammed sequence without any consideration of real time behavior. The second method is the demand based controller which response to the preprogrammed timer based on real time sensor detection on a certain road junction. With both method widely used around the world, surety on traffic flow smoothness is not established. When authorities talk about efficiency and accuracy on real time traffic flow control, there are always room for further enhancement especially on the controlling and sensing method. In the afford to provide a solution for such miseries, a novel implementation of sensing method which will be incorporated with self conditioning program will be a practical solution. The new sensing method is capable of counting the total number of vehicles entering a certain junction and exiting from a certain junction on real time basis. Based on this detection, the programmablelogic controller will trigger the traffic light indicators according to real demand. The new method should al
programmable logic controllers (PLC) devices play an important role in automation systems;therefore, technicians must have adequate training with these devices. If a student wants to learn about PLCs, they will find t...
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The implementation of programmable logic controllers (PLC) based control system in a gas transmission pipeline by Delevan compressor station of Pacific gas and electric company is discussed. The station control system...
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The implementation of programmable logic controllers (PLC) based control system in a gas transmission pipeline by Delevan compressor station of Pacific gas and electric company is discussed. The station control system allows operators to designate each unit as the base unit or as a stand by. The system also allows the various units to operate in parallel into the header and change of unit designations while the units are on line.
programmable logic controllers (PLCs) of the MICRO-EH series are of all-in-one-type with various inputs and outputs in a compact body. These PLCs enable controlling conveyers, packing machines, assembling machines, ai...
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programmable logic controllers (PLCs) of the MICRO-EH series are of all-in-one-type with various inputs and outputs in a compact body. These PLCs enable controlling conveyers, packing machines, assembling machines, air-controlling machines, and other controlling systems.
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