Today, I will look at the future of PLCs in the automation industry from the perspective of a user. As an old driver who has been in the industry for more than a decade. I have to say that the current automation industry is already a situation in which "a hundred schools of thought contend and spend thousands of flowers." Why do you say that? Just as China's move toward a manufacturing powerhouse came to China's manufacturing 2025 vision, it was at the time of the launch of Industry 4.0 advocated by Germany, when the United States raised the banner of the industrial Internet. All automation vendors and industry veterans have come up with a common goal of IT and OT convergence, IT is information technology, and OT is operational technology (automation technology). These advanced technological concepts, advanced solutions, like the pear blossoms with no worries, nourish the Chinese people's desire for automation and information integration.
I hope to automate users and rationally treat this era of knowledge expansion. Sit down and think about it. What do you need? And what can automation products give you? Cut into the topic, let's take a look today, what kind of PLC do you really need as a user? The function of PLC does not want to be repeated here. Everyone basically deals with it directly and indirectly every day. It can be said that PLC has become synonymous with the automation industry. IT and OT in the integration of the truth, I give you a few thought points, regardless of which manufacturer's products.
1. High reliability of PLC.
Imagine what PLC has been doing for the past 10 years? Has been expanding the functionality. And the stability is not as good as before. It is estimated that many manufacturers have begun to prepare the bricks in their hands. I don't know how many people still remember the S5 of the Western family, the PLC5 of Luojia, the 984 of Shijia, the products of that era, the stability is extremely high, and now the products often require G3 anti-corrosion, etc. In that era, what protection No, but no failure, a PLC5 in the aluminum workshop full of toner for 15 years, spare parts have not been replaced, is not afraid to pull down to purge and repair. So why is this here? In fact, the circuit board of that era is not highly integrated. PLC designers need to design and select parameters for circuit boards and components. In those days, these designers were all circuit enthusiasts, so the reliability and stability of PLC at that time. Very high, of course, the price is also very expensive. However, the humanization of operation can be said to be extremely poor, hindering the development background of the operating system of that era. But what about the reliability of the current PLC? Due to the emergence of highly integrated chips, the PLC board is now very simple, you open it and look at the chip and simple peripheral circuits. The benefit of this high integration is simplicity, but the downside is that reliability is greatly reduced. For the EMC test, sometimes the manufacturer has no way, the integrated chip is a problem, then do it! Still hope that as the user first pay attention to the stability of the PLC itself, we must know that as a large-scale PLC, especially the redundant architecture of the product, the first task is to 稳定, stable operation control program, the IO according to the logic to collect and output Then consider other things!
2. The functionality of the PLC.
Next, let's talk about the functionality of PLC. The TIA of the West is in full swing, and the S1500 winds up. In fact, it is more about talking about functions, such as the unification of tool software (configuration and monitoring together), the unification of control functions (motion control, transmission control, process control), can support WEB diagnosis (new function of 1500), one Multiple network ports are integrated on the CPU (that is, the previous CP card is integrated). In fact, you can see that automation manufacturers have a purpose, "integration", integrate the functions previously dispersed in different product structures, and are very proud and proud to say to customers that we have developed an epoch-making intelligent PLC, and the future is two The basis of integration. I want to laugh when I see this. It seems that without integrating these functions, it will hinder the automation industry from flying. The function that users really need is SDC (software-defined controller), which is the unified standardization of tools for future programming configuration. It can be programmed by each programming PLC through a programming tool, whether it is control or monitoring. For each PLC, you only need to provide the operating environment. Because the CPU chip used by the PLC is rapidly iterative, the performance and functions are increased in geometric multiples. Just as ARM intends to challenge Intel, the embedded CPU is no longer a dry meal. In the future, I am boldly guessing here. I personally think that the HMI product will disappear and replace it with PLC base based web monitoring. In fact, everyone can think of the future PLC as a small computer. There is no work that it can't do. At this time, you can think about functional problems again. It is not a problem.
3. The openness of PLC.
Here we mainly discuss the network. It is this question that I don't want to talk about more, because once I say this question will cause too many manufacturers to resonate, why? In fact, everyone knows that the main battlefield of automation will be at the communication protocol level for the next 10 years. Whether it is Profinet (S7), Ethernet/IP (CIP) or Ethercat and Powerlink, it is competing for the market share of customer products. Industrial Ethernet is all over the place, and you can't wait to get a GB/T ,, or even want to kill /T, so you can win the opportunity in the field of automation. (Many people will ask, brother, you forgot Modbus tcp, not Modbus tcp has been compiled by odva, the protocol stack has been integrated by CIP). Then the user will ask which agreement is good? In fact, there is nothing good, depending on which one you choose, the industrial communication protocol is divided into two camps, which are divided into standard TCP/IP and standard TCP/IP. (Ethernet/IP and PowerLink are standard TCP/IP protocol stacks, and Profinet and Ethercat are TCP/IP-based protocol stacks. These two are very different as customers. If you choose a standard TCP/IP protocol, you can use industrial control products on a standard IT architecture without regard to protocol conversion. The problem is that there is no need to worry about the future of TCP/IP. He is building a 7-layer protocol. And if you choose a TCP/IP based protocol? What is based on? In fact, it is to modify the TCP/IP message or even modify the 2-layer communication chip (Ethercat). The advantage of this protocol is that it is developed for industrial control applications. When building IT and OT integration, the border device needs to use this. Network equipment supported by the protocol vendor. There is not much difference between the two in the basic control (IO, site to site), and the user can't feel it at all. In the open, the standard TCP/IP protocol vendors may have some innate advantages. But in special industries and fields, TCP/IP-based protocols still have their own advantages for areas that require extremely fast communication speeds, you think! The original 150-byte TCP/IP message has been streamlined, it will be a matter of making you easy and enjoyable, even more so on the MAC layer has been issued!
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