The Application of Programmable Controller to Chip Design. Shihong Lan 1, Jian Zhang 2

Transcription

1 Applied Mechanics and Materials Online: ISSN: , Vol. 273, pp doi: / Trans Tech Publications, Switzerland The Application of Programmable Controller to Chip Design Shihong Lan 1, Jian Zhang 2 1 Sichuan University of Science & Engineering, Zigong, Sichuan, China 2 Chengdu Pusala Technology Co.,Ltd, Chengdu, Sichuan, China lanshihong@sci-e.com Keywords: Programmable Logic Controller; Chips; Application Abstract. In the field of modern industrial control, PLC has become the important equipment in automatic control. With the development of semiconductor technology, chip technology, the embedded PLC chipset emerged. The chipset microcontroller cores, PLC system software is loaded with high-performance, low power consumption, small size and other characteristics. User to flexibly customize according to their needs, using chipsets embedded PLC. This paper described the PLC chip design and application. Introductions PLC is a specially designed for applications in industrial environments, the operation of the electronic digital computing device. It can be programmed using the memory to perform logical operations in its internal storage operator sequence, timing, counting and arithmetic operations such as instruction, and through digital or analog input and output, the control of all types machinery or production process. PLC and related peripherals should connect industrial control system to form a whole, easy to extend the principle of functional design. Characteristics of the Programmable Controller PLC High Reliability PLC, due to the use of modern LSI technology, strict production process, the internal circuit takes advanced anti-jamming technology, high reliability. For example, the productions of the F series PLC Mitsubishi mean time between failures of up to 300,000 hours. Some redundant CPU PLC, the average time between failures is longer. From the PLC machine outside the circuit, using the PLC to constitute control system, and compared to the same scale as the relay contactor system, the electrical wiring and the switch contacts have been reduced to hundreds or even thousands of times, failure greatly diminishes. In addition, PLC with self-detection functions of the hardware failure, failure alarm information in a timely manner. In the application software, the application can also be incorporated into the self-diagnostic program for peripheral devices, so that the system, in addition to the circuit outside the PLC and equipment fault self-diagnosis Protection. In this way, the entire system has high reliability is not surprising. System Design, Construction Workload Small, Easy to Maintain, Easy to Transform PLC storage logic instead of wiring logic greatly reduced control equipment external wiring, control system design and construction cycle is much shorter, and maintenance easier. Is more important is that the same device after changing the program to change the production process become possible. It is suitable for many varieties, the production of small quantities of occasions. Small Size, Light Weight, Low Energy Consumption Ultra-small PLC, for example, recently produced varieties bottom size less than 100mm, and weighs less than 150g, only a few watts of power consumption. Due to the small size, easily loaded into the internal machinery is to achieve the mechatronic the ideal control equipment. All rights reserved. No part of contents of this paper may be reproduced or transmitted in any form or by any means without the written permission of Trans Tech Publications, (ID: , Pennsylvania State University, University Park, USA-05/03/16,21:41:40)

2 Applied Mechanics and Materials Vol Chips Profile Chip is the carrier of the integrated circuit, divided from the wafer. The chip through the package can be made of common electronic components; can also be such as flip chip technology applications in the surface of the circuit board and the IC card, sending the answering machine. The word was first produced in In basic subjects, a chip is a tiny memory chips anomalies on behalf of said memory is not abnormal change means that this type of memory is no need to continue to maintain the energy. Design Approach Have two camps: FPGA and ASIC chip design. FPGA is a "soft" way. ASIC is the "hard" way. Become a reality because of deep submicron technology, but also because more and more IP modules FREE, an FPGA allows the user to the entire system, including the processor, main line, memory, more specific features, and user design logic, all quickly integrated into a single chip. Moreover, the FPGA single chip can reconfigure, design update is never a problem., Low production manufacturers, FPGA saving a disposable chip design costs. Programmable Controller Chip Design Microcontroller and PLC Chipset Secondary Development Application Needs Analysis The chipsets characteristics of the decision the embedded PLC system applies only to that small control system. For the chipsets application should meet the following requirements: the volume is small, to meet the basic I / O functions and process control functions, you need good humancomputer interaction, network communication function and good expansion capabilities, chipset shorter development cycle may be higher, lower costs, but also to ensure Reliability. Chipset Selection Chipset as the core components of the embedded PLC system, the embedded PLC system design process is crucial. What kind of chips used in a system group, depends primarily on the application area, the needs of users, the cost, the development of the degree of difficulty and other factors. Determine which chipset; the next step is to combine the needs of system peripherals, the peripheral interface circuit design. The Peripheral Interface Circuit Design from embedded PLC constituent can know, just a chipset not constitute embedded PLC system, using chipset functionality provided interface according to the user's needs, the second development, the peripheral interface circuit design, enabling control system to be achieved by the user. The peripheral circuit design to follow the modular principle, the principle of standardization. The Application Design and Development When the hardware design is in accordance with the needs of users, this is just to build the embedded PLC system hardware platform; this platform can not achieve the control functions of the PLC. In addition to the hardware platform, must also have the support of the software. In order to truly achieve the functionality required by the system. It is necessary to develop the software. The Embedded Chipset PLC Temperature Control System Design The embedded PLC User Control requires custom hardware to meet specific functional requirements, flexible and convenient. The embedded PLC chipset developed PLC products to meet the individual needs of the user, to save costs and shorten the cycle. Embedded PLC Application Development of Key Technologies Embedded PLC user applications, the PLC system software is built on the controller. In order to improve the efficiency of the implementation of the whole system, reduce application costs, the need to continue to strengthen the system software designed to solve some of the key issues to achieve a combination of powerful features and simple operation.

3 724 Manufacturing and Engineering Developments The Input and Output of the Switch Analog Input and Output Fig. 1 DC input interface circuit Fig. 2 Relay output interface circuit The Modbus Data Communications and Human-Computer Interaction Human-computer interaction components including keyboard, IR remote control, LED or LCD display. Operations control staff at the scene of a node. Independent key wiring schematics have shown key input, for example, human-computer interaction interactive interface via the serial interface and control system to interact button to send information or data to the control system, the user through the keyboard for easy operation. Independent connected keyboard sentenced Kin fast, easy to operate, but accounting for I/O port lines more. The Matrix-connected keyboard sentenced Kin slow, accounting for less I/O port lines. The Agricultural Greenhouse Controller's Design Temperature Control Function the Demand and CUBLOC Embedded Chipset Greenhouse as an important part of the agricultural facilities, the control and management technology has kept rising. Greenhouse systems in general, the number of sensors is not a lot of eight the sensors analog input to meet requirements in a single region. The Overall Structure of the Greenhouse Controller Design greenhouse controller to investigate in advance of the greenhouse venue, design temperature, humidity and other sensors to detect the temperature and humidity set standard values. Through the CB290 treatment information and coding information sent via the MODBUS network communication to the host computer, the host computer will receive the data decoding. Comparing the decoded information, the formation of the control decisions, and transferred to the controller via the communication module. By CB290 call processing, control actuator to perform the operation. Embedded PLC Chipset Development Embedded PLC chipset is a loaded Embedded PLC software platform core chipset with PLC functionality and CAN, RS232/485 communication function, able to complete the control module of the conventional process control. On this basis, can be easily and quickly design PLC products. Embedded PLC chipset block diagram.

4 Applied Mechanics and Materials Vol The Embedded PLC System Structural Design The embedded PLC system structure can be divided into the overall, modular and hybrid. Overall The embedded PLC integral power chipset, interface circuits are integrated on a printed circuit board, its compact structure, small size, low price, the general embedded micro PLC in this structure. The embedded PLC integral different interface circuit and expansion unit also has a special function units, such as analog unit, fuzzy control unit and the position of the control unit, the functionality of the system to be expanded. Modular The modular structure refers to the various parts of the PLC that is divided into a number of separate modules, such as the power supply module, CPU module, I/O modules and special function modules. The modular structure has flexible configuration and assembly, and easy to expand and maintain. But the cost is high. This form is generally more complex in the system, integration is inconvenient time, the use of a modular structure, the function of each part of the system is very clear. Hybrid The hybrid is monolithic and modular combined. In addition to the basic unit and expansion unit, it also includes expansion modules and special modules, have flexible configuration. Necessarily, some of the units can be integrated together; some of the unit may be individually made modular. Summaries With the development of science and technology, the functionality of the chipset will be more powerful chipset based embedded PLC system function will be richer, broader scope, the perfect man-machine interface, complete communication equipment will be better adapted to the places the needs of industrial control, embedded PLC as an important part of the automation and control network and Universal Network, will be in the field of industrial control play an increasingly large role. References [1] Shao Meiping. Analysis of Control Strategy of PLC-based embedded intelligence [J]. Science and Technology Innovation Herald. 2011(32) [2] Jiang juan, Feng ping, Kang jichang. Development of embedded soft PLC System[J]. Science Technology and Engineering. 2011(03) [3] Wang zulin, Zhou licheng. System study of Fuzzy Control Based on PLC automatic batching[j]. Block-Brick-Tile. 2011(04) [4] Meng hongru, Hu guichi, Fu yusheng. Wireless control system based on PLC's celestial model[j]. Instrumentation Technology. 2011(04) [5] Chen houzhen, Chen long, Shan pengzhu. Development and application of PLC based water level monitoring and control devices[j]. Programmable Controllers and Factory Automation. 2011(04)

5 Manufacturing and Engineering Developments / The Application of Programmable Controller to Chip Design /