PAC or PLC
Choice PAC instead of the 20 grounds PLC
Choice PAC instead of the 20 grounds PLC
In the establishment of control systems, system integrators, without exception, always want to use less equipment to achieve more. They need to control the system not only to deal with digital I / O and movements, but also can be integrated for automatic monitoring and testing of visual function and modular instruments. In addition, the control system must also be able to handle real-time control algorithms and analysis tasks and the data sent back to business. Whether you can function at the same time a PC and PLC (programmable logic controller) reliability? Automatic programmable controller (PAC) is one such platform that could best combination of the PC and PLC two advantages, and is gradually occupied the field of industrial automation.
Market research firm ARC Advisory Body PAC introduced for the first time this term, which defines a new type of controller, the controller incorporates a PC processor, RAM and software advantages, PLC, as well as the inherent reliability, robustness and distribution characteristics. PAC use of COTS (current commercial) technology is ideally suited for industrial environment, it is scalable, easy to maintain and less time characteristics of a fault. PXI (for equipment Extended PCI) has become a fast-growing platform PAC if NI, Chroma, LeCroy and JTAG, and so now vendors can provide more than 1000 kinds of unique I / O modules, including analog I / O, digital I / O, vision, movement and high-precision data acquisition. PXI combines the PCI bus circuit characteristics and CompactPCI Ouka strong mechanical structure, and this structure has been used successfully in industrial environments for many years.
Ten years ago when the Internet is still in its embryonic form, machine vision is very expensive, and PC-based instruments have not occurred, then the entire rule PLC automation field. Even today, those who use digital I / O for simple control engineers are still PLC is the best option. However, if you take into account the PLC to increase visual, movement, instruments and analysis functions, then you will understand why the PAC is gradually occupied automation. In this paper we will be in terms of cost, advanced features, shape structure, controller, I / O and software 6, the details of automation applications in the future than in the PAC 20 reasons for the PLC.
Cost
1. Using a single controller cost savings You can now consider the use of PAC, it has a single controller and chassis, can be used to deal with digital and analog I / O, a movement, visual function and modular instruments, so there is no need spend money to buy multiple controllers. If you need to control the system with a variety of functions, such as visual or modular instruments, it will be a PAC is the most economical.
High function
2. Control in the energy or senior high cost of the material circumstances, engineers need to optimize their simple PID control algorithm in order to minimize waste. These often using complex algorithms such as fuzzy logic or neural network control design techniques, allowing for the reduction and minimization of the stability of time process control. Traditionally, the PLC can achieve the PID control algorithm does not provide specific process optimization. Advanced control algorithms need not only a powerful floating-point processor, but also take a lot of memory, while the use of PAC platform to meet these conditions.
3. Analysis in the real-time machine control applications, the need for real-time acquisition and from analog or digital I / O channel data, which can effectively detect fault conditions. You may have to be carried out such as order tracking and vibration analysis of these complex work to effectively detect the status of machines. For these applications, you can use the PAC efficient platform for real-time analysis.
4. Database / network connectivity from the plant's use of real-time data, operators in the control room can be the basis of the information of decision-making. However, to control system has the function of the output data at the scene is very difficult. Enterprise systems generally use standard ODBC, ADO and XML to obtain data from the automated system. PLC only through standard OPC communication, which implies the need to increase the use of a PC OPC data acquisition and use such as ODBC, ADO and XML standards such data transmitted to the enterprise. In order to be effective in the field of data transmission to the ERP system, the control system must be able to direct communications and external databases - you can use the PAC to complete these tasks. 5. Safety of the control system and database and network connectivity, you need to consider security issues. For the benefit of security, many companies choose not to automation systems and corporate databases connected, but for most companies, the benefits brought about by connecting to far greater than safety concerns.
Although the PLC can be locked to prevent others from the factory network intrusion, but because PLC via Ethernet packets sent non-encrypted, so it is not suitable for the prevention of hacking. PAC in the transmission of data through the network, the data can be encrypted. Although this is not the first factor to be considered, but in the future it will be a plant within the distributed system using PAC factors.
6. Uncertainty application of different speeds PLC only a fixed speed operation, and it is not for a different cycle of rate independent processing design. Today, the complex control systems often need a variety of rate certainty application, it needs a number of cycle, each cycle running at different rates. This requires parallel processing can be carried out, but only in the PAC run on the operating system to have such characteristics.
Shape structure
7. Environment suitable for factory engineers choose the PLC it is a common cause of the environment in the factory work. However, the vast majority in the PLC is the installation of NEMA. In this environment, the PXI platform additional cooling device, the outer surface of solid and enhanced resistance to impact and vibration indicators PLC and the system has the same reliability.
8. Scalability and flexibility because manufacturers tend to use flexible automation systems continuously updated to meet the requirements of customers, so they need to control the system is modular, flexible and scalable. PLC system due to the I / O constraints, and only in the digital campaign with scalability, and the PAC not only has the flexibility PLC, but you can also increase the visual system, modular instruments or high-speed analog I / O . You can also use Ethernet to a number of PC and in accordance with the need to increase or reduce the number of PC.
9. Easy replacement for field engineers, be reduced to the minimum down time is very important. In the control system upgrade or replace I / O modules, you need to replace the greatest extent possible to reduce or increase the workload of modules. PAC modular characteristics meet this requirement.
Controller
10. Computer power for the machine condition monitoring such as high-speed, large memory needs of the application, have a high-speed processor and high-capacity memory is very important. As a result of your use of the existing hardware to build a system based on PAC, the PAC controller so you can use with the Pentium 4 processor, and G of RAM.
11. Storage functionality if not be able to save and view historical information, then the information is also available in what is the use? PLC traditional lack of data on the record function. The PAC can be your designated time, manner and the data format to record data.
12. Digital I / O Traditionally, the platform PLC digital I / O only for industrial sensors and actuators to provide standard voltage drive current. However, the new modules such as the NI 651x series of digital I / O can provide the voltage 24 V, up to 500 mA of drive current and optical isolation, and it has watchdog timer, programmable power activated state, used to enhance the safety and reliability of the input filter characteristics, and cost only five US dollars per channel.
13. Analog I / O mainly due to high speed PCI bus for the traditional PC-based platform to provide analog I / O. At present some PLC also has analog I / O modules, but their programming is very complicated and is not suitable for high-resolution and large volume of data and applications. PAC provided by the analog input rate can be as high as 200 M per second and with 24-bit resolution.
14. Motion control in a variety of platforms, especially when you need than two-axis movement way, the software plays a major role. PXI platform in the motion controller can provide up to 8-axis movement, but also can use NI campaign aides on the system easy to configure.
15. Machine vision data transfer rate in the PLC platform provides visual function of the biggest obstacles. At present, whether you want to or automatic monitoring parts of the test drug packaging, you can use PXI platform for visual simulation applications, digital cameras and FireWire. You can control procedures for a variety of integrated visual algorithms such as pattern matching, optical character recognition, color matching, color specifications and testing.
16. Apparatus Recently, material handling companies have started their automation system integration testing, and thus to provide customers with a comprehensive testing and automation programme. I / O required for modular instruments including digital, signal source, arbitrary waveform generators and other equipment. These types of I / O needed for the platform in the PAC have high-speed data transfer rate.
17. PLC networks and similar, and the PAC can be through a variety of fieldbus industrialization to provide interconnectivity, such as FOUNDATION Fieldbus, DeviceNet, CAN, Modbus, Ethernet, Profibus, such as serial port. PAC not only as a distributed I / O module control equipment, but also can be used as subordinate equipment has been added to the system.
Software
18. PAC in the real-time operating system platform you can use such as RT Linux, Pharlap ETS, QNX and VxWorks real-time these operating systems (RTOS). Generally speaking, real-time system programming is very difficult, but the use of LabVIEW RT such as software engineers can be changed real-time systems. Engineers now can be on the development of Windows to download real-time delivery platforms, such as PXI controller.
19. Man-machine interface, and especially in the mixed industrial process control, the majority of the need for a control system connected to the control system man-machine interface. One from a touch screen HMI component, it can contain an embedded controller can not. Because the system based on PAC took into account for I / O using the same controller, so you would not need add extra HMI embedded controller to achieve the image display.
20. Easy-to-use development environment although the traditional ladder logic programming is well suited for digital I / O programming, but to deal with the analog I / O, sports or visual programming this way is very troublesome. PAC common language can be used to prepare control procedures, provide you a great deal of flexibility, these common language including C, C + +, Visual Basic, LabVIEW is even traditional ladder logic.
Clearly, now is the addition of PLC control engineers can also have another choice. PAC can provide you the additional requirements for advanced PC functions to control, real-time analysis or access to the corporate database, and at the same time maijavascript:void(0)
Publish Postntain the reliability of the PLC. If you need to integrate not only digital I / O and motion control or the need for faster computer processing power, the PAC may be very good option.
Choice PAC instead of the 20 grounds PLC
In the establishment of control systems, system integrators, without exception, always want to use less equipment to achieve more. They need to control the system not only to deal with digital I / O and movements, but also can be integrated for automatic monitoring and testing of visual function and modular instruments. In addition, the control system must also be able to handle real-time control algorithms and analysis tasks and the data sent back to business. Whether you can function at the same time a PC and PLC (programmable logic controller) reliability? Automatic programmable controller (PAC) is one such platform that could best combination of the PC and PLC two advantages, and is gradually occupied the field of industrial automation.
Market research firm ARC Advisory Body PAC introduced for the first time this term, which defines a new type of controller, the controller incorporates a PC processor, RAM and software advantages, PLC, as well as the inherent reliability, robustness and distribution characteristics. PAC use of COTS (current commercial) technology is ideally suited for industrial environment, it is scalable, easy to maintain and less time characteristics of a fault. PXI (for equipment Extended PCI) has become a fast-growing platform PAC if NI, Chroma, LeCroy and JTAG, and so now vendors can provide more than 1000 kinds of unique I / O modules, including analog I / O, digital I / O, vision, movement and high-precision data acquisition. PXI combines the PCI bus circuit characteristics and CompactPCI Ouka strong mechanical structure, and this structure has been used successfully in industrial environments for many years.
Ten years ago when the Internet is still in its embryonic form, machine vision is very expensive, and PC-based instruments have not occurred, then the entire rule PLC automation field. Even today, those who use digital I / O for simple control engineers are still PLC is the best option. However, if you take into account the PLC to increase visual, movement, instruments and analysis functions, then you will understand why the PAC is gradually occupied automation. In this paper we will be in terms of cost, advanced features, shape structure, controller, I / O and software 6, the details of automation applications in the future than in the PAC 20 reasons for the PLC.
Cost
1. Using a single controller cost savings You can now consider the use of PAC, it has a single controller and chassis, can be used to deal with digital and analog I / O, a movement, visual function and modular instruments, so there is no need spend money to buy multiple controllers. If you need to control the system with a variety of functions, such as visual or modular instruments, it will be a PAC is the most economical.
High function
2. Control in the energy or senior high cost of the material circumstances, engineers need to optimize their simple PID control algorithm in order to minimize waste. These often using complex algorithms such as fuzzy logic or neural network control design techniques, allowing for the reduction and minimization of the stability of time process control. Traditionally, the PLC can achieve the PID control algorithm does not provide specific process optimization. Advanced control algorithms need not only a powerful floating-point processor, but also take a lot of memory, while the use of PAC platform to meet these conditions.
3. Analysis in the real-time machine control applications, the need for real-time acquisition and from analog or digital I / O channel data, which can effectively detect fault conditions. You may have to be carried out such as order tracking and vibration analysis of these complex work to effectively detect the status of machines. For these applications, you can use the PAC efficient platform for real-time analysis.
4. Database / network connectivity from the plant's use of real-time data, operators in the control room can be the basis of the information of decision-making. However, to control system has the function of the output data at the scene is very difficult. Enterprise systems generally use standard ODBC, ADO and XML to obtain data from the automated system. PLC only through standard OPC communication, which implies the need to increase the use of a PC OPC data acquisition and use such as ODBC, ADO and XML standards such data transmitted to the enterprise. In order to be effective in the field of data transmission to the ERP system, the control system must be able to direct communications and external databases - you can use the PAC to complete these tasks. 5. Safety of the control system and database and network connectivity, you need to consider security issues. For the benefit of security, many companies choose not to automation systems and corporate databases connected, but for most companies, the benefits brought about by connecting to far greater than safety concerns.
Although the PLC can be locked to prevent others from the factory network intrusion, but because PLC via Ethernet packets sent non-encrypted, so it is not suitable for the prevention of hacking. PAC in the transmission of data through the network, the data can be encrypted. Although this is not the first factor to be considered, but in the future it will be a plant within the distributed system using PAC factors.
6. Uncertainty application of different speeds PLC only a fixed speed operation, and it is not for a different cycle of rate independent processing design. Today, the complex control systems often need a variety of rate certainty application, it needs a number of cycle, each cycle running at different rates. This requires parallel processing can be carried out, but only in the PAC run on the operating system to have such characteristics.
Shape structure
7. Environment suitable for factory engineers choose the PLC it is a common cause of the environment in the factory work. However, the vast majority in the PLC is the installation of NEMA. In this environment, the PXI platform additional cooling device, the outer surface of solid and enhanced resistance to impact and vibration indicators PLC and the system has the same reliability.
8. Scalability and flexibility because manufacturers tend to use flexible automation systems continuously updated to meet the requirements of customers, so they need to control the system is modular, flexible and scalable. PLC system due to the I / O constraints, and only in the digital campaign with scalability, and the PAC not only has the flexibility PLC, but you can also increase the visual system, modular instruments or high-speed analog I / O . You can also use Ethernet to a number of PC and in accordance with the need to increase or reduce the number of PC.
9. Easy replacement for field engineers, be reduced to the minimum down time is very important. In the control system upgrade or replace I / O modules, you need to replace the greatest extent possible to reduce or increase the workload of modules. PAC modular characteristics meet this requirement.
Controller
10. Computer power for the machine condition monitoring such as high-speed, large memory needs of the application, have a high-speed processor and high-capacity memory is very important. As a result of your use of the existing hardware to build a system based on PAC, the PAC controller so you can use with the Pentium 4 processor, and G of RAM.
11. Storage functionality if not be able to save and view historical information, then the information is also available in what is the use? PLC traditional lack of data on the record function. The PAC can be your designated time, manner and the data format to record data.
12. Digital I / O Traditionally, the platform PLC digital I / O only for industrial sensors and actuators to provide standard voltage drive current. However, the new modules such as the NI 651x series of digital I / O can provide the voltage 24 V, up to 500 mA of drive current and optical isolation, and it has watchdog timer, programmable power activated state, used to enhance the safety and reliability of the input filter characteristics, and cost only five US dollars per channel.
13. Analog I / O mainly due to high speed PCI bus for the traditional PC-based platform to provide analog I / O. At present some PLC also has analog I / O modules, but their programming is very complicated and is not suitable for high-resolution and large volume of data and applications. PAC provided by the analog input rate can be as high as 200 M per second and with 24-bit resolution.
14. Motion control in a variety of platforms, especially when you need than two-axis movement way, the software plays a major role. PXI platform in the motion controller can provide up to 8-axis movement, but also can use NI campaign aides on the system easy to configure.
15. Machine vision data transfer rate in the PLC platform provides visual function of the biggest obstacles. At present, whether you want to or automatic monitoring parts of the test drug packaging, you can use PXI platform for visual simulation applications, digital cameras and FireWire. You can control procedures for a variety of integrated visual algorithms such as pattern matching, optical character recognition, color matching, color specifications and testing.
16. Apparatus Recently, material handling companies have started their automation system integration testing, and thus to provide customers with a comprehensive testing and automation programme. I / O required for modular instruments including digital, signal source, arbitrary waveform generators and other equipment. These types of I / O needed for the platform in the PAC have high-speed data transfer rate.
17. PLC networks and similar, and the PAC can be through a variety of fieldbus industrialization to provide interconnectivity, such as FOUNDATION Fieldbus, DeviceNet, CAN, Modbus, Ethernet, Profibus, such as serial port. PAC not only as a distributed I / O module control equipment, but also can be used as subordinate equipment has been added to the system.
Software
18. PAC in the real-time operating system platform you can use such as RT Linux, Pharlap ETS, QNX and VxWorks real-time these operating systems (RTOS). Generally speaking, real-time system programming is very difficult, but the use of LabVIEW RT such as software engineers can be changed real-time systems. Engineers now can be on the development of Windows to download real-time delivery platforms, such as PXI controller.
19. Man-machine interface, and especially in the mixed industrial process control, the majority of the need for a control system connected to the control system man-machine interface. One from a touch screen HMI component, it can contain an embedded controller can not. Because the system based on PAC took into account for I / O using the same controller, so you would not need add extra HMI embedded controller to achieve the image display.
20. Easy-to-use development environment although the traditional ladder logic programming is well suited for digital I / O programming, but to deal with the analog I / O, sports or visual programming this way is very troublesome. PAC common language can be used to prepare control procedures, provide you a great deal of flexibility, these common language including C, C + +, Visual Basic, LabVIEW is even traditional ladder logic.
Clearly, now is the addition of PLC control engineers can also have another choice. PAC can provide you the additional requirements for advanced PC functions to control, real-time analysis or access to the corporate database, and at the same time maijavascript:void(0)
Publish Postntain the reliability of the PLC. If you need to integrate not only digital I / O and motion control or the need for faster computer processing power, the PAC may be very good option.
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