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In the face of many manufacturers of various types of PLC, they have advantages and disadvantages, can meet the various needs of users, but in the form, composition, function, network, programming and other aspects are incompatible, there is not a unified standard, can not make horizontal comparison. The following is put forward in the design of automatic control system on the selection of PLC some views, can be used as a reference in the selection of PLC.
You can choose the right product by comparing the following aspects.
This is particularly important. At the beginning of the automatic control system design, we should have an accurate statistics of the number of control points (digital and analog amount), which is often the first condition for choosing PLC, generally choose more than 10%~30% PLC control points. There are several considerations:
1, can make up for the missing points in the design process;
2, can ensure that in the process of operation, when there is a failure of individual points, there can be alternative points;
3. The need to increase points in the future.
Working environment is a hard indicator of PLC work. Automatic control system will free people from the busy work and harsh environment, it requires that the automatic control system can adapt to the complex environment, such as temperature, humidity, noise, signal shielding, working voltage, etc., each type of PLC is not the same. Be sure to choose products that are suitable for the actual work environment.
FBM230-P0926GU
Now PLC is not a simple field control, PLC remote communication has become a control system must solve the problem, but the manufacturers of communication protocols vary widely, poor compatibility. At this point, the following aspects should be considered:
1. Communication between products of the same manufacturer. Each manufacturer has its own communication protocol, and there is more than one. This is obvious in large and medium-sized machines, and in small and micro machines are not the same, some manufacturers for capacity, price, function and other aspects of consideration, often do not have or have different from other protocols, and relatively simple communication. Therefore, in this respect, the main consideration is the communication between different types of PLC of the same manufacturer;
2. Communication between products of different manufacturers. If the automatic control system design belongs to the existing automatic control system part of the transformation, and the choice is different from the original system PLC, or the design needs 2 or more than 2 PLC, and choose the products of different manufacturers, which needs to consider the communication between the products of different manufacturers;
3. Is it good for the future? Due to the different communication protocols developed by various manufacturers, there is no unified standard in the world, so the selection of PLC is greatly restricted. Consider the communication protocols that are influential, developed, fully functional, and nearly universal.
The program is the “heart” of the whole automatic control system. The quality of the program directly affects the operation of the whole automatic control system. Programmers and programming software are required by some manufacturers to purchase additional and expensive, this should also be taken into account.
One is to use a special programmer provided by the manufacturer. Also divided into various specifications and models, large programming function is complete, suitable for various types of PLC, high price; Small programming structure is small, easy to carry, low price, but simple function, poor applicability; The other is to use programming software based on the PC application platform, which has been adopted by most manufacturers. Due to their different products, the manufacturers often only develop programming software suitable for their own products, and the programming software style, interface, application platform, flexibility, adaptability, easy programming, etc. can only be evaluated after the user’s personal operation.
Programming languages are complex, diverse, seemingly identical, but not universal. Commonly used programming languages can be divided into the following five categories:
This is the PLC manufacturers use more programming language, the first is from the relay control chart evolution, relatively simple, for discrete control and interlocking logic is useful;
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