Analysis of the difference between PAC and PLC -

Although the form of a PAC is similar with the traditional PLC controller, but the performance of pacs system is much more than PLC extensive and comprehensive. PAC is a kind of multi-functional controller platform, it contains a variety of users can according to oneself apiration combination, collocation and implementation technologies and products. But rather than on the contrary, the PLO is a kind of structure based on proprietary products, only with the manufacturers think necessary 'SuiZhou nanning.

PAC with PLC the basis of the fundamental difference is that they are different. The performance depends on the dedicated hardware of PLC, PLC application is rely on dedicated hardware chip to realize. Improvements to the function of PLC, such as increased motion control, process control and communication ability, you need to use different hardware. Even for the same PLC manufacturer, the dedicated hardware is also difficult to migrate to different performance of PLC, and the hardware structure of the system of the traditional PLC manufacturers are proprietary, and even the processor chip is a dedicated chip, thus causing the with the constant improvement of the PLC functional requirements, PLC hardware system is becoming more and more complicated, and due to the versatility will lead to the function of the system hardware prospects and can open is limited by a lot of, this is why the performance of the PLC controller CPU is usually much more backward than the PC's CPU. In addition, the operation of the PLC system is usually the PLC manufacturer dedicated operating system, and the current popular real-time operating system is not compatible, because is a proprietary operating system, real-time reliability and function cannot be compared to the general real-time operating system, which makes the PLC with the overall performance of the specificity and closeness.

PAC is based on the performance of its light control engine and the standard, general, open real-time operating system, embedded type system design of the hardware and the backplane bus. PAC light control engine is one of the most obvious characteristics of it, before the PAC of PLC control system, such as user application hosting are implemented through hardware, PAC has designed a generic, in the form of software control engine used in the application execution, control engine between real-time operating system and application, the control of engine and the basis of the fundamental difference is that they are different. The performance depends on the dedicated hardware of PLC, PLC application is rely on dedicated hardware chip to realize. Improvements to the function of PLC, such as increased motion control, process control and communication ability, you need to use different hardware. Even for the same PLC manufacturer, the dedicated hardware is also difficult to migrate to different performance of the PLO, and traditional PLO factory hardware structure of the system are proprietary, and even the processor chip is a dedicated chip, thus causing the with the constant improvement of the PLO functional requirements, PLC hardware system is becoming more and more complicated, and due to the versatility will lead to the function of the system hardware prospects and can open is limited by a lot of, this is why the PLO CPU performance is usually much more backward than the PC's CPU. In addition, the operation of the PLC system is usually the PLO manufacturer dedicated operating system, and the current popular real-time operating system is not compatible, because is a proprietary operating system, real-time reliability and function cannot be compared to the general real-time operating system, which makes the PLC with the overall performance of the specificity and closeness.

PAC of the operating system USES the general real-time operating system, such as GE Fanuc PAC Systems, a series of products including general, mature WindRiver Vx Works real-time operating system, its reliability has been confirmed by global a large number of applications, such as the Mars probe 'endeavour' and 'spirit' in some real-time operating system is the Vx Works. PAC system hard Wu structure adopted standard, general embedded type system structure design, so that the processor can use the latest high performance CPU, such as GE Fanuc PAC Systems, a series of products of the CPU that 300/700 MHZ Pentium processor is adopted, and the forthcoming Pentium M processor CPU.

PAC system usually adopt standard and open backplane bus, such as GE Fanuc PAC Systems, a series of RX7i VME64 bus is adopted; RX3i cpci-bus is adopted, the two bus is now the most popular in the field of embedded type control bus standard, all can support multiple CPU parallel processing capabilities, and the adoption of open standards of backplane bus, make GEFanuc PAC Systems, a series of products can support a large number of third-party modules, and integrate it into PAC Systems products, such as CPU, communication templates, I/O templates, etc. , embodies the superiority of openness. The communication rate of 1 gb. The PAC system programming soft Wu for unified platform, integrated with many functions in the field of - — Includes logic control, motion control, process control and man-machine interface and so on various functions, for data points Tags to use unified database, and support multiple PAC in a project goal programming, and is suitable for the application of process control system, also suitable for factory production lines set up the unified programming. PLC, which is based on proprietary technology and software and hardware of the PAC with standard general Wu, can use the COTS ( Commodity off-the-shelf) Products and technologies, this helps to ensure that the system reliability and availability, because you can ensure that the hardware and software of the rapid and convenient maintenance; To lower the price of the system and reduce down time, because you can always get the spot; Increased openness, flexibility and extensibility.

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