The ongoing changes to hardware have begun to homogenize today, PLCs should not have to compare who's CPU execution faster? Whose storage is bigger? Who can bring more I/O points? What programming language can I use? As a core product of industrial control, PLC has produced many changes, all of which are rooted in the revolution brought about by IT technology. Storage is getting cheaper and bigger, so you can store a lot of real-time data on the PLC, and the CPU is getting faster and faster. The problems that were not solved before are being solved easily, and the display is more and more diverse. And rich, the demand for hardware is getting faster and faster, but standardization and generalization are the future trends. Therefore, the competition is no longer in the hardware itself, and the era of performance is about to pass.
The era of PLC to be more open and integrated with various technical functions has arrived. This includes motion control, safety, hydraulics, robotics, CNC, real-time communication, FDT, wireless Ethernet, GPRS, etc., which are widely infiltrated into the control, PLC. To become more open, you can survive in the future.
Technology is moving toward convergence - integrated solutions The widespread use of PC technology has enabled the controller's energy to expand indefinitely, and the rich software applications also make the CPU must be faster and stronger. IT technology provides this, and the Intel-based embedded CPU has already It is widely used in industrial control, and the concepts of PAC, PCC, PLC, PC, DCS, and SCADA are being integrated with each other, and gradually integrated with professional technologies such as GIS and SQLServer. The control technology is forming an integrated whole, single. PLCs or PCs have become flattened in the requirements of the entire control application, and the boundaries have begun to blur. The concept of dedicated controllers and general-purpose controllers has also begun to blur, and the world is moving toward convergence.
If you simply talk about the performance and function of the PLC, it is impossible to reflect the whole picture of the high-end PLC. You can only look at the PLC in part, but must combine the industrial requirements and the product design architecture and concept of the high-end PLC manufacturers.
The development of high-end PLC technology
1. The IT industry is driving the automation industry
1.1 makes the hardware more general
With the development of IT technology, CPU processing power, communication speed (Ethernet technology), storage and expansion capabilities, software function blocks (OPC), diagnostic and maintenance capabilities (IT-based maintenance) capabilities and display capabilities have been Significantly improved, and the development of IT technology has also led to the continuous decline in hardware costs, and IT competition makes the chip easier to obtain, but the cost is lower.
1.2 Standardization and modular design
In order to reduce the production and manufacturing costs of the system, PLC products are constantly moving towards modularization and standardized design.
Therefore, the development of domestic PLC products should always pay attention to the promotion of IT technology to the development of automation, and focus on how IT technology is integrated into automation technology.
2. The demand for complex control drives the development of PLC. Whether it is PLC, PCC or PAC technology, its development aim is to meet the control requirements of more complex machines and production sites. Distributed computing puts new demands on the bus, and production integration The demand for software SCADA and DCS is increasing, and PLC will be responsible for more functions here.
The original application of PLC was mainly developed for logic control. With the demand for field data for IT technology, communication technology, sensor technology and production management, in order to track the production process, analyze the influence factors of process and quality, the demand for field data is constantly Improvements, environmental and safety requirements have also led to the development of safety technologies that affect the control requirements of PLCs:
2.1 complex algorithm design
Today, in the field of machine control, there are some similar PID adjustment and process algorithm design (color registration, tension, weighing, drafting, unwinding, winding) in the field of process control. PLC requires superior algorithm design and processing capabilities, such as : B&R's PCC can be programmed in C, C++, which is easier for complex algorithm design, while Bachmann's PLC can be based on C, C++, Java programming, and SoftPLC's SoftPLC can also be based on Java programming.
2.2 Motion Control
Due to the small number of motion control actuators on the previous machines, dedicated motion controllers are usually used. Nowadays, the motion control applications are more extensive, and they are more widely used in various mechanical manufacturing fields, as well as in papermaking, beer production lines, tobacco, etc. For a wide range of applications, this has more requirements for motion control such as electronic gears, electronic cams, positioning control, such as SIEMENS's T-CPU series to complete the motion control task processing, while B&R's PCC can pass directly The bus control servo drive implements various motion control algorithms.
2.3 Security Technology
With the demand for personal safety and equipment safety, various PLC manufacturers have developed Safety LOGIC products designed for safety applications, such as SIEMENS's 317F, 319FCPU for safety applications, ABB's PLUTO Safety PLC, Rockwell AutomaTIon, B&R developed the Safet LOGIC PLC.
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