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The final trend of PLC technology exhibition is still one of the focuses of people's debate. Most people think that PLC will continue to lose market share; what is even worse is that in the face of industrial PCs, PLC will go to death step by step; but some people believe that some special industrial applications will still provide certain market share.
In the field of global industrial computer control, great changes have taken place around open and re-open process control systems, open process control software, and open data communication protocols. PLCs are almost everywhere, but this trend may not continue. With the birth and further improvement and development of SoftPLC control configuration software technology, the market share with SoftPLC configuration software and industrial PC control system is gradually increasing. These facts make the traditional PLC suppliers ideologically Dramatic changes have taken place. They must face reality and make a more open and high profile in the development and improvement of traditional PLC technology. For the control software, this is the core of the PLC controller. The PLC supplier is providing open-end programming configuration tool software to industrial users, and it is very active for industrial users. In addition, open communication network technology has also been a breakthrough, the result is to integrate PLC into a more open industrial control industry.
Second, open and based on industrial PC control
PLC manufacturers have begun to watch the impact of industrial PC-based control technology. Some experts even believe that the new technology and open technical specifications brought by the new business activities will bury traditional PLCs. PLC manufacturers believe that although there are a large number of PLC control devices installed on the industrial site, they still need to work with industrial control software companies in order to develop their own industrial PC-based process control software.
It is true that several years ago there was a clear mixture of old and new PLCs in industrial sites. Industrial users had to learn new and old knowledge at the same time, and even learn from each other. Most PLC manufacturers provide only soft logic and an operating platform for industrial users.
In the high-end applications, it is difficult to further distinguish between the PLC control system and the industrial PC control system, because both use the same type of microprocessor and memory chip. Imagery metaphorically, if you forget the literal meanings of industrial PCs and PLCs, then what you can observe in the box is just some basic computer hardware technology. What we observe more is the complexity of those basic technologies. Chemicals and hybrids, these technologies are effectively combined into the control system.
In addition, the reason for adopting open control is the need for system function integration on the one hand, and on the other hand due to the over demanding function of some industrial users. If you can give a high degree of attention, you can get more basic technical knowledge. PLC manufacturers focus on system functionality while industrial users focus on system applications. People can see that the future development trend is to further integrate more functions into a control box. Therefore, events such as sequence control and process control will be handled in a functional manner. Others such as motion control can also be shared in the same control structure system.
It is believed that PLC technology will continue to shift toward open control systems, especially industrial PC-based control systems. The latter in addition to the flexibility in the traditional PLC has a distinctly different advantages, but also has other advantages, such as can shorten the system into the market cycle, reduce system investment costs, improve the efficiency of the data flow from the bottom of the factory to the office automation Wait.
The problem of real-time response to industrial PC control systems has been well resolved. Perhaps the main thing is still hidden behind the technology, but it lacks corresponding tracking records. For PLCs, sturdiness is one of its main features, and there are already quite a number of tracking records to verify. Industrial users still treat the PLC with great care, and they are doing different technical tests on the PLC. When using a new technology, the question that industrial users need to consider is how much risk they have to take, and at the same time it needs to consider how many opportunities and benefits they can bring to their business activities.
However, industrial users do not fully believe the benefits of open control systems. With the further development of technology, they began to dilute these ideas. Industrial users are balancing the risks of adopting new technologies and the benefits of their business activities in order to provide effective protection for future decisions.
Industrial PC technology offers many features that enhance the PLC's features, including built-in video and high-speed floating-point digital coprocessors. Although Microsoft has no plans to further enhance this feature, the new Windows CE 3.0 is fully able to better meet the needs of process control.
Not long ago, Siemens announced a new set of software products based on open control systems, namely version 3.0 of SIMATIC WinAC (Windows Automation Center). WinAC is a control system solution based on Windows NT that is compatible with SIMATIC S7 PLCs and suitable for industrial PCs. WinAC 3.0 offers the connectivity of Profibus fieldbus LANs with higher integration and remote programming. In addition, it provides a new DeviceNet I/O device driver for localized integration of field control devices for connecting to installed DeviceNet I/O devices.
Steeplechase Software has also introduced an embedded Windows NT operating system interface component that supports hard real-time process control. This component further integrates hard real-time control software from Steeplechase's Industrial Compact PCI with SBS technology running in the Windows NT environment. Steeplechase's visual logic controller has now been upgraded to version 5.0. The controller is suitable for Windows NT 4.0 and Windows 2000 operating systems, its real-time engine can be directly integrated with the ordinary Ethernet and TCP/IP. The 5.0 version of the controller utilizes an enhanced OPC server driver and therefore runs faster than previous versions. Other features include new OI network features and the ability to allow industrial users to design rich and colorful dynamic graphics.
Transysoft recently introduced a new version of the ISaGRAF series industrial control configuration package, ISaGRAF PRO, which is a soft logic automation control package based on the IEC 61131-3 international standard and independent of any hardware platform. In a networked process control system environment, the software package can be applied to the development of a variety of configuration and distributed control systems. It contains a set of development tools, application work platforms, and corresponding "virtual machine" runtimes. aims. This runtime target can run on a variety of hardware platforms.
CTC Automation Engineering has released a new set of control software, MachineLogic PCLC (Industrial PC Logic Controller), which allows industrial PCs to play the role of PLC and still maintain the functional characteristics of industrial PCs. The software can complete the control tasks determined by a PLC and is as fast as the program execution time, all within 1 ms. It can also handle multi-task work at the same time, but it cannot exceed 16 control tasks at the same time. A mechanism with a prioritized and multitasking kernel keeps track of each control task, ensuring that control tasks get the highest priority. The software can run all five IEC 61131-3 standard programming languages ​​and PID control programs, supporting two types of I/O control devices. One is fieldbus I/O devices like Profibus and DeviceNet; the other is industrial PC I/O modules like ISA and PC/104. In addition, the software also provides online editing configuration functions for the control system. The program can be developed and run under Windows 95/98 and Windows NT, but it can also be executed under RTXDOS.
SoftPLC also provides Tealware, an industrial control software product that has been vividly described as a PLC wearing an industrial PC suit. The control systems installed on the rack already have the form factor of a small PLC, but SoftPLC's control software has been embedded in the CPU. Tealware software can meet the needs of various types of industrial users, from small, stand-alone systems to large, distributed multi-control workstation applications. Features include a full range of I/O modules, built-in Ethernet, and industrial serial communication interfaces.
Recently, Tealware software has been upgraded to version 2.3. Among them, the control software provides a virtually infinite ladder logic control step, allowing more than one million words of data tables; many OI/SCADA application interfaces; built-in Java engine and FTP server for remote maintenance and management; support User-written C, C++, Java programs, and device drivers; suitable for embedded Web servers; online operation of program design; robust I/O module support capabilities and many other standard PLC functions; Or, the converted AB company's PLC-5, PLC-2/PLC, PLC-3 and SLC-500 programs.
Third, the expansion of Ethernet and further accommodate Web technology
Currently, one of the biggest trends in all process control areas is the expansion of Ethernet technology. The PLC is an exception. Now, more and more PLC suppliers are beginning to provide Ethernet interface components. In the last few years, we have seen that it is a trend to develop a PLC that is more powerful than the existing ordinary XiaoLing PLC. Will Ethernet be the communication standard for PLC? Perhaps the end result is this, but it is still too early. There is a common misconception that providing an Ethernet interface on a PLC will solve all communication problems. Ethernet only defines several layers of protocol standards at the bottom of the OSI reference model. If the upper layer protocols are incompatible with each other, it is still impossible to communicate with each other. For example, this is just like a conversation between a Chinese who does not understand English and an American who does not understand Chinese is not able to make a phone conversation. Therefore, the protocol is the language that the devices communicate with each other.
On the other hand, the pace of progress has already been taken. We only have to face difficulties. In order to apply Ethernet technology to plant floor process control equipment, the ODVA Association has established a set of global standard technical specifications. Ethernet/IP standards to be able to solve the difficulties encountered in the actual work.
One of the things that is close to Ethernet is to be able to connect anywhere you want via the Internet. In fact, in some unexpected places, Web servers are showing their power. A few years ago, some PLC systems had built-in Web servers, which undoubtedly added more features to the PLC system. Other types of control devices are also preparing for further integration with Web servers. For example, Square D Company already has an engine control center with an Ethernet connection interface and is preparing to develop a transmission device with a Web server connection interface.
Benefits of having a built-in Web server body include open networks, business tools, and client/server relationships. In the past, industrial users may have typically asked for some information about PLCs, but now, due to the constant birth and development of new technologies, it is easy for industrial users to get information about this. On the other hand, with the large-scale production of chips and processors, PLC manufacturers can produce and provide open-network products, allowing industrial users to purchase PLC products with excellent functions at a small cost.
Schneider has become one of the pioneers in providing technical support for connecting PLCs to Ethernet and the Web. Recently, the company introduced a new fast Ethernet (100 Mb/s) module that runs on the Premium PLC platform. This module provides a full-duplex auto-sensing 10/100 Mb/s connection speed for PLCs that can connect to TCP/IP. The live process controllers can share real-time data information and automatically scan Momentum I/O modules. Any other field control device based on the Modbus communication protocol uses an embedded Web server to provide HTML communication services while providing SNMP for standard network communication management. At an exhibition, Schneider also showed industrial users their concept of a transparent factory.
In addition, Schneider recently introduced adapters based on Modicon's Momentum MIE family of processors that provide standard IEC program control capabilities, further providing a perfect solution for e-manufacturing. The adapter also provides the ability to connect intelligent I/O systems and other on-site process control devices to the Internet and Ethernet. On-site process control devices include all functional real-time process controllers.
A few years ago, Rockwell Automation also provided Ethernet interfaces in its PLC products and was steadily steadily improving the features of the Ethernet. The company has recently announced a flexible I/O module solution that uses non-patented versions of Ethernet technology to provide real-time process control performance. Type 1756 ControlLogix I/O from AB is also a component based on the standard Ethernet TCP/IP and UDP data transfer protocols. The application layer uses an open, object-oriented, producer/consumer-based technology. This technology can also be found in the ControlNet, DeviceNet and FF fieldbus H1 network systems.
Similarly, many other companies have also introduced Ethernet communication interface modules. For example, the communication interface provided by IDEC's OpenNet PLC controller enables compatibility with fieldbus devices such as DeviceNet, LonWorks, and Interbus. The controller utilizes an Interbus remote I/O master card that can handle no more than 480 local I/Os and 512 remote digital I/Os.
The 8051 industrial communications bridge provided by Sierra provides a good integration of PLC, DCS, RTU and SCADA systems that are incompatible with each other. This industrial communication bridge enables high-speed network applications over RS-232, 422, 485, or Ethernet communication links. The bridge controller provides eight RS-232 serial communication interfaces, two RS-485/422 isolated serial communication interfaces, two 10Base-T Ethernet interfaces, and one connection for redundant hot standby bridges Device.
The multi-vendor interface kit from ProSoft provides serial communication capabilities for AB's PLC, SLC, ControlLogix, and FLEX I/O (including the 1771, 1746, 1765, and 1794) platforms. Each module contains an 80386 processor and is embedded with a DOS operating system. Therefore, it can be considered as an industrial PC with I/O capability. In addition, the controller also has an "A>" disk operation prompt. , as well as the Autoexec.bat and Config.sys files. Applications can range from simple ASCII communications to sophisticated 32-bit control algorithms.
Another company, Giddings & Lewis, who is usually involved in motion control research, has also added Ethernet TCP/IP interfaces to its line of motion control products for the PiC (Programmable Industrial Control) and MMC (Mechanical and Motion Control) series. These unit components provide the ability to connect to the factory's internal Intranet and the Internet, allowing data information to be shared between on-site process controllers. Between on-site process controllers and industrial PCs, OPC server device drivers are usually used to connect real-time data information, and Ethernet network systems and Web technologies can be used for remote file transfer, program design, and system maintenance.
Nowadays, more and more companies are planning to gradually connect all their automation control devices to enterprise-wide information systems. For industrial users, perhaps they have noticed the Ethernet for Control series of control solutions, the technology is more dependent on Ethernet and the Internet. Almost all PLC vendors provide Ethernet connectivity in some of their serialized products, and some companies have already decided to completely embed Web servers inside their devices in order to fully demonstrate the performance characteristics of the PLC. Utilizing the Web connection feature of PLC, industrial users can not only monitor the operation status of the control system from anywhere, but also obtain any required data information just like the system manual.
Of course, if industrial users are starting to connect their control systems to the Internet, a secure information release address must be set up for this purpose. In addition, in order to prevent hackers from entering the control system, a set of firewall software with good security performance must also be installed.
SoftPLC has invested a great deal of enthusiasm and interest in network security. They have embedded a real-time and deterministic Java virtual machine into the process controller. Java makes it possible not only to run Web-based Active X control objects, but also to run Servlets. Servlets are highly integrated Web server tasks that provide dynamic Web page content. Servlets program code is clearly visible, object-oriented design, modularization, development is very simple and clear, Servlets also provide data information security performance, allowing further restrictions on real-time data information, such as only selected industrial users, or selected Registered data information. If the process controller is effectively connected to the Internet, then security is very important to it.
Hacking is not the only annoyance. If the network system is paralyzed, what do we need to do first? Hacking solutions use redundancy. Redundant IP addresses, redundant network systems, redundant communication cables, and hot backups are used in the process controller to provide good service for the process control system when an emergency occurs.
Many PLC suppliers continue to improve and improve communication performance during the development of their products. Their development direction is mainly oriented to Ethernet technology and Web-based technology.
Omron provides full Ethernet connectivity in its products. With its TCP/IP data transfer protocol, its products are fully compatible with all Ethernet specifications. In addition, the company recently released several new products based on Profibus-DP. The CS1 controller platform provides the operating characteristics of the main unit components to allow all process controller devices on the Profibus-DP network to run on the production platform; a new set of Sycon-DP configuration tool packages is also provided. Allows industrial users to easily configure the process control system and delegate the management of the network; in addition, a new multi-I/O terminal can be used as a Profibus-DP slave unit, which provides an interface for communication units. For connecting one or more I/O module units, there are Ethernet specifications. In addition, the company recently released several new products based on Profibus-DP. The CS1 controller platform provides the operating characteristics of all process controller devices on the Profibus-DP network that the master unit components allow to establish on the platform; it also provides a new set of Sycon-DP configuration tool packages. Allows industrial users to easily configure the process control system and delegate the management of the network; in addition, a new multi-I/O terminal can be used as a Profibus-DP slave unit, which provides an interface for communication units. Connecting one or more I/O module units works well with the company's C200H series PLCs.
Rockwell Automation also actively adds support for Ethernet connectivity in its products, including the Ethernet/IP, FLEX I/O, MicroLogix, and PanelView family of products specifically for ControlLogix. Similar products include ProcessLogix, PLC, and SLC 500 process controller families. Through further improvement and improvement, its products can simultaneously support the transmission of both implicit and explicit data information. With the help of implicit data information transmission methods, its data fields only contain real-time I/O data information.
The ControlLogix Ethernet/IP lineup includes an Ethernet/IP bridge module, an Ethernet/IP communication interface module, RSLinx software packages, and an Ethernet/IP communications interface transceiver. The FLEX I/O network interface module is suitable for Ethernet/IP, including a 10/100 Mb/s Ethernet/IP, including a 10/100 Mb/s Ethernet/IP fiber adapter. For MicroLogix, CompactLogix, SLC500 process controllers and other process control devices utilizing the DF1 protocol, the 1761-NET ENI Ethernet interface is supported for explicit data information transfer.
Automationdirect.com has introduced a new Ethernet Remote Master Module (H2-ERM) for its D2-240 and D2-250 PLCs. This new module connects the local CPU base unit to the remote slave I/O subsystem via a high speed Ethernet link. Each module can support 16 additional DL205 module units, 16 terminator I/O subsystems, 4 fully extended DL405 subsystems, or a mixture of any of these three types. Subsystems connected using Category 5 UTP cables must not exceed 100m between them. Repeaters can be used to extend the transmission distance and the number of nodes. If optical fiber transmission media is used, the distance can reach 2000m.
Advantech recently introduced the WebLink 2040/SDA product, which embeds Web server software that allows any machine, process controller, and smart sensor to be connected to the Internet or Intranet with Web-based HMI-SCADA software. The product also allows industrial users to securely access real-time data information from anywhere in the world via the Internet to monitor and control any on-site process equipment or system. In addition, through the company's Advantech Studio suite of software, industrial users can convert real-time, live graphics, trend records, alarm logs, reports, and recipes to a standard browser, anytime, anywhere.
Another type of Web server module from Newport Inc. is iServer, which makes it possible to connect existing PLCs and other control devices to the Internet. This DIN rack-mounted modular unit allows no more than 32 control devices with serial communication interfaces to connect to Ethernet and the Internet, acting as a Web server and an RS-232, 422, 485-compatible Ethernet serial bridge.
However, not all PLC communication performance improvements are for Ethernet or Internet. Not long ago, Rockwell Automation announced a new version for ControlNet and applies to AB's PLC-5C field controllers and SLC 500 adapter modules. The deterministic and nondeterministic network connectivity features provided by the 1747-ACN15 and 1747-ACNR15 adapter modules for SLC (1746) I/O are now fully compatible with their PLC-5C field controllers.
Moeller Electronics previously used a proprietary communications protocol and has now begun to move toward open network protocols. Their new generation of I/O structure called XI/ON will become an integral part of its PLC development. With this architecture, fragment and modular design work is possible. The integrated gateway allows connection to Ethernet, Profibus-DP, DeviceNet, CANOpen, and more network systems.
The enhancement of PLC-related communication performance is not only reflected in hardware but also fully reflected in software. For example, KEPware Corp. has introduced a new generation of 32-bit Control-Logix Ethernet OPC server drivers for its KEPserverEX family of products. The OPC driver software improves the speed and connectivity between OPC and DDE customers and AB's ControlLogix field controllers; it also provides a flexible human-machine interface; you can freely use AB's OPC server suite. It also includes the PLC5/SLC505 Ethernet driver. It also further optimized the 1756's ENET interface, improved communication performance, and supported the company's automated identifier database.
Fourth, process control applications
Although traditional PLCs have been applied in the field of discrete process control, PLCs have been widely used in the field of continuous process control, and the development trend based on continuous process control technology is further growing. Communication is a key technology for PLC applications. This technology has been expanded in the PLC field. As with systems, decentralized processing of PLCs has become possible, so it is easier to manage them so that they can be better integrated.
Facing the enormous competitive pressures existing in the traditional industrial process control market, many PLC suppliers are beginning to actively transfer the process control applications they serve, and must abandon some of the market share that traditional PLC applications already occupy.
After a short period of hard work, Siemens rolled out its PLC products based on process control, introduced SIMATIC PCS products before 1990, and upgraded their products to PCS in 1997. This development work has continued We are satisfied with Siemens, but with the constant birth and development of various new technologies, the development work will not stop. Although both discrete and continuous process control applications use the same hardware products and network systems, additional special modules may be needed, but there are always some differences between them. As long as different types of application software are loaded into the same system, different process control applications can be completed.
Any PLC supplier will continue to concentrate on the research and development of batch and hybrid process control. As a good example, Schneider Automation just brought us its QPC (Quantum Process Control) product, which enables a control system to be truly fully targeted in the field of process control. QPC uses a networked distributed PLC system to complete process control applications. Based entirely on Quantum PLCs and Momentum I/O operating platforms, QPC can scale from a single Quantum PLC to a distributed system and can also be fully integrated with Ethernet, Internet, and TCP/IP technologies.
Rockwell Automation plans to further enhance the process control performance of AB's ControlLogix multifunction controller while adding a redundant set of solutions and flow meter modules. Its 1756-CFM configurable flow meter module will provide the ability to support two channel 0-120 kHz frequency inputs and accept input signals from most turbine or mass flow meters. In version 6.0 of RSLogix 5000, both the function block diagram (FBD) and the process control instruction table will be provided. Its ControlLogix platform also integrates RSView's visual HMI software components. In ControlLogix, ActiveX panel display controls work with process control instruction tables and provide the perfect picture display for process control applications based on RSView. In addition, its RS series batch control applications also provide integrated S88 batch processing capabilities.
Toshiba Corporation has released its V-Series integrated process controller that can further integrate PLC systems, DCS, and work to control computers. Its main features include: providing a common set of configuration engineer toolkits for all three operating platform modes; providing a common backplane bus architecture for any combination of sequence controllers, loop controllers, and computer modules; Provides a common identifier database for global process variables and Windows NT 4.0; also provides a common set of Ethernet-based LAN network systems. The controller programming language is compatible with the IEC 61131-3 standard. Its Web connectivity capabilities help industrial users remotely configure, find and repair faults and other engineering activities.
The Siemens PLS 7 process control system was originally based on the SIMATIC S7-400 PLC and has recently been upgraded to version 5.0. One of its greatest features is a flexible distributed server/multi-client architecture that perfectly combines open bus architectures. Communication protocols based on Profibus and HART fieldbus are widely used for field control device integration; Profibus fieldbus, industrial Ethernet, TCP/IP are used for system bus; Ethernet TCP/IP and Fast Ethernet are used for terminal bus and enterprise integration Connection.
Similarly, Rockwell Automation has also introduced an enhanced ProcessLogix decentralized control system. Subsequently, it announced its FlexLogix decentralized control system, which contains the 5430 FlexLogix controller and existing Flex I/O control equipment products. The Model 5430 controller and AB's ControlLogix multifunction controller use the same process control software package RSLogix 5000 as Rockwell Automation.
Rockwell Automation's ControlLogix 5550 multifunction controller has added 3 new instructions to meet the needs of motion control, and has also added two new coordinate types. By allowing RSLinx software to receive all identifier data lists with a single request command, network data throughput is greatly improved. In addition, the OI tool now has a graphical interface that allows for the monitoring of trend chart and histogram values, adding a system browsing tool.
In the PPC-2000 hybrid temperature controller introduced by Watlow Anafaze, multi-loop PID control function and programmable logic control function are integrated in the same process control software package, with 48 PID loops and 48 digital I /O point ability.
Moore introduced the Internet-based control system, Procidia, specifically designed for process control. The system is controlled by Internet technology, Procidia. The system uses local and remote operations and controls through the Internet and intranets of an enterprise, using self-configuration methods based on industrial PCs HMI and OPC server.
VMIC brought the industrial PC-based controller VMIPC-8400, which also embeds the corresponding IOWorks process control software package. The VMIPC-8400 complies with the IEC 61131-3 international standard and is ideally suited to the needs of continuous process control and PLC applications.
V. Redundancy features
In the field of industrial process control, the demand for products with higher reliability systems has been increasing year by year, the vast majority of which are driven by economic interests. The cost of a factory downtime loss is extremely expensive, and the resulting production costs increase. Especially in Europe, the main body of a series of rules and regulations is gradually being improved and strengthened. The IEC 61508 standard now published provides a design basis for the safety performance of the process control system, which is mainly formulated for the functional safety design within programmable electronic systems.
PLC has been used for a long time in the field of safety shutdown system. Perhaps Triconex and Pilz can provide us with many insights about this application, but other PLC suppliers are also looking at the prospects of this application area, but also make some PLC hardware suppliers feel very tricky. SoftPLC has introduced a solution for a redundant system to meet this application requirement and has also been applied in practical projects. Its application experience tells us that the main secret lies in the careful selection of hardware and unique I/O structure, and they also find some bus systems suitable for the application in this field and other unmatched things.
Other well-known PLC suppliers have recently provided corresponding products for safety and redundancy applications. Rockwell Automation has just launched the Guard PLC 1200 and 2000 series of safe process controllers and, along with its existing PLC system, provides monitoring and regulating safety operations for all automation systems. The process controller contains a redundant CPU system and uses internal test circuitry to check the operation of the I/O modules instead of directly using redundant I/O modules. The system complies with the IEC 61508 standard safety technology specification and is also accredited by the TuV product service organization. It can be fully applied to automated process control applications with SIL 3 safety level requirements.
Rockwell Automation also adds redundancy options to industrial users in its ControlLogix platform. A new software component is suitable for the 1757-SRM system redundancy module in order to make the appropriate choice. It can use RSLogix 5000 programming software to form a redundant system with other modules and use standard components such as power supplies, chassis, and ControlNet bridges.
Schneider Automation offers industrial customers a choice of Quantum family hot backup solutions for critical applications. When similar data information passes through the Quantum family of remote I/O processors, the host processor and data information it connects to needs to pass back and forth between the check link and the processor itself. The hot standby processor can monitor the addresses of the Modbus TCP/IP, Modbus+, and Modbus communication interfaces, so the control transmitter for client computer communications is explicitly transmitted.
Triconex recently announced a series of new products. Including a new version of the Trident triple modular redundancy controller that can be used in small application systems up to 450 measuring points, its features include an analog output module, a pulse input module and an enhanced communication function In addition to modules, it also includes off-the-shelf analog inputs, digital inputs/outputs, and solid state relay output modules. In addition, the controller is also fully compatible with the OPC connection specification, at the same time it is certified by the Tuv Rheinland organization and meets the SIL 3 safety level requirements, and also complies with the DIN AK 6 level installation specification.
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Rockwellå…¬å¸æœ€è¿‘为其Compact Logix系列产å“å¢žåŠ äº†ä¸€ç§æ–°çš„Compact Logix 5330控制器。该控制器能够与1769系列Compact I/O模件，ä¸è¶…过256个本地I/O测点，å¦å¤–还为用户æ供了256kbå˜å‚¨å†…å˜ã€‚CompactLogix使用了相åŒçš„能åŒæ—¶è¢«ControlLogixã€Flex Logixã€SoftLogixå’ŒRSLogix 5000共享的Logix控制引擎。
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Review of PLC's 2005 Development Trend
I. INTRODUCTION For a long time, PLC has always been the main battlefield in the field of industrial automation control, providing a very reliable control application for a variety of automated control equipment. The main reason is that it can provide safe and reliable and relatively complete solutions for automation control applications, which is suitable for the current industrial enterprises' needs for automation. On the other hand, PLC must also rely on other new technologies to face the impact of the shrinking market share, especially the impact of industrial PCs. The problem that PLC needs to solve is still the adoption of new technology, system openness and price.