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It plays a very important role in the automatic control system. Therefore, the correct choice of PLC is very important.
Faced with the most advanced types of PLCs from many manufacturers, they have their own advantages and disadvantages, which can satisfy the most advanced needs of users, but they are incompatible in terms of form, composition, function, network, and programming. , Without a consistent specification, horizontal comparison is impossible. Here are some opinions on PLC selection in the planning of automatic control system, which can be used as a reference when selecting PLC.
Able to compare the following aspects to choose a suitable product.
1. The amount of work
This is particularly important. At the beginning of the automatic control system planning, there should be an accurate statistics on the number of control points (digital and analog). This is often the primary condition for selecting a PLC. Generally, a PLC with 10% to 30% more control points should be selected. There are several considerations:
1. Able to compensate for missing points in the planning process;
2. It can be ensured that there can be a replacement point when there is a failure at a certain point in the running process;
3. The need to increase points in the future.
2. Operating environment
The operating environment is the hard target of PLC operations. The automatic control system frees people from busy work and harsh environments. It requires the automatic control system to be able to get used to the messy environment, such as temperature, humidity, noise, signal shielding, operating voltage, etc. The various PLCs are not the same. Be sure to choose products that are accustomed to the practical operating environment.
3. Communication network
Nowadays, PLC is no longer simple on-site control. PLC remote communication has become a problem that the control system must solve. However, the communication protocols drawn up by various manufacturers are very different and have poor compatibility. At this point, the following aspects should be considered first:
1. Communication between products of the same manufacturer. Each manufacturer has its own communication protocol, and there is more than one. This performance is obvious on large and medium-sized computers, but not the same on small and micro computers. Some manufacturers often do not have a relatively simple communication that is different from other protocols because of capacity, price, function and other considerations. Therefore, the primary consideration in this regard is the communication between different types of PLCs from the same manufacturer;
2. Communication between products of different manufacturers. If the planned automatic control system is part of the transformation of the existing automatic control system, and the PLC selected is different from the original system, perhaps two or more PLCs are required in the planning, and a different manufacturer’s PLC is selected. Products, which need to consider the communication issues between products of different manufacturers;
3. Whether it is beneficial to the future. Because the communication protocols drawn up by various manufacturers are different, and there is no consistent international standard, so the PLC selection is greatly restricted. It is necessary to consider a communication protocol that has a large impact, has development, is fully functional, and is close to common use.
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