How to choose and PLC products

In modern industrial production equipment, a large number of digital and analog control device, such as the start-stop motor, solenoid valve open and close, the product of the count, set and control of the temperature, pressure, flow, etc. , these automatic control problem in the industrial field, if using the programmable controller ( PLC） To solve the problem of automatic control has become one of the most effective tool. Hardware of PLC products on the market at present many of choose and buy, in addition to the domestic brands, abroad are: Japan's OMRON, MITSUBISHI, FUJJ, anasonic, Germany's SIEMENS, South Korea's LG, etc. Price of the product have larger decline in recent years, PLC, the performance-to-price ratio is higher and higher, it is the important reason for the many technical personnel selection of PLC. So, how to choose PLC products? 1, the system should first determine the single machine control system with PLC, or the use of PLC controller network formation, the input and output points of PLC. Number, and the choose and buy of PLC on the basis of the practical need points when you leave a certain allowance ( 10%) 。 Load type 2, according to the PLC output is dc or ac type of load, high current or low current, as well as the frequency of the PLC output point action, so as to determine the output using relay output, or the output transistor, or a voltage output. The different load to choose different ways of output, it is important for the stable operation of the system. Although each manufacturer abroad 3, storage capacity and speed of PLC is approximately the same products, but also to have certain difference. Between companies is not fully compatible with the product. To develop software of each company is different, and the storage capacity of the user program and instruction execution speed are two important indexes. General storage capacity is larger, the faster the speed of PLC, the higher the price, but should be reasonable selection of PLC products according to the size of the system. 4, the choose and buy of programmer PLC programming can use three ways: is the handheld programmer programming in general, it can only use business rules statement table the statement in programming. This way the efficiency is low, but the system capacity is small, small dosage of product is good, and small volume, easy commissioning, cost is low. Is to use graphics programmer programming, the programmer USES the ladder diagram programming, convenient and intuitive, general electrical personnel in the short term can be used freely, but the programming unit price is higher. Is to use an IBM personal computer and PLC software programming, this way is one of the most efficient way, but most of the company's development of PLC software package is expensive, and the way is not easy to commissioning. Accordingly, should according to the size of the system and the difficulty, the length of the development cycle and the situation of the capital reasonably choose PLC controller products. 5, try to choose the company's product quality guaranteed, and good technical support, after-sales service is better also, commonly also benefit your product extension and software upgrades.
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