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Ok all you geniuses out there, Please help a fellow out here. Certainly a small problem (or none) for most of you, but for novis, a setback.. Installation: a small, 3 level cargo-carrier up a hill. One electric motor, two contactors (one for each direction of motor) 2 sensors per level (one extra for security) - Inductive I have made the program, Ladder and FBD, in Siemens Logo software (the PLC is Logo). The issue is when the “call-button” at the middle level is pushed, I can not implement in the program, that sensing if the “wagon” is up or down, which contactor to use, and using the sensors in the middle to stop. I’m stuck..
With the rise of China's industry, the demand for the PLC market has increased rapidly. Domestic PLC manufacturers have gone through the rapid development of decades. From the initial follow -up of international brands, to gradually having independent brands and independent research and development capabilities, especially in small PLC products mainly OEM markets, local manufacturers have completed technological breakthroughs. Occupy a certain market share. However, in the domestic and medium -large PLC markets, local manufacturers have not been able to form an effective breakthrough. Therefore, in the overall PLC market, domestic PLC's market share is still small. So why do users prefer PLCs of imported brands such as Siemens and Mitsubishi? We might as well explain from the following points. 1. Brand ability First of all, brand capacity is a key factor that affects the choice of users, and product capabilities are directly related to the user's project feasibility. International brands such as Siemens and Mitsubishi have a long history, their product performance indicators are high, and software and hardware are rich in selectivity. For example, from the most basic logo to S7-200/Smart, S7-300, S7-400, S7-1200, and S7-1500, products can be suitable for micro, small, medium and large systems. Redundant and security system. In particular, some complex environments and special processes have quite high requirements for the reliability of PLC. In this case, I think no company dares to take the world to let a new product try to try the water! 2. Ecological environment Having a powerful ecological environment is the ultimate goal of every brand's dreaming and unremitting pursuit. No matter how good the product is, it is anxious before forming a certain ecological environment. In addition to paying attention to product capabilities, most customers must also pay attention to the cost of product use, secondary development costs, and ecological environmental factors such as compatibility with third -party systems. (1) Basic learning cost Everyone knows that many schools and training institutions are taught by PLC brands such as Siemens and Mitsubishi, and the learning resources of these big brands have more channels to obtain. Brand ashamed. Although the use of various brands has a certain similarities, it is not easy to cross the brand quickly, such as drawing, wiring, programming design and maintenance work often need to come back. What is more terrible is the new horse things. It is often impossible to ban on -site testing, which will directly affect the progress of the project, and even some unpredictable problems. (2) Industry application cases If PLC manufacturers do not have more successful application cases in a certain industry, even if the product is cost -effective, it is difficult to use it. These industry cases need to be accumulated for many years. If you originally used PLCs of imported brands such as Qingyue Siemens or Mitsubishi, or the entire production line was introduced abroad, it would be more difficult to replace it with other brands. These large foreign PLC brands are rich in application cases in various industries and can better meet users' needs for security and stability. However, many domestic PLC brands lack such successful industry applications, and it is difficult to prove that their products can achieve good results in practical applications. Therefore, local large -scale PLC products will face many difficulties during the initial development of the market. Once there is a wealth of application cases in a certain segment industry, it will break through the critical value and usher in continuous domestic replacement. (3) The ecological environment of the user In addition, the user ecology is also an important factor. Imported brands such as Siemens and Mitsubishi have comprehensive software ecology and support. The number of third -party developers and rich cases. Only this brand with large user bases can be more realistic in secondary development. the value of. In contrast, the domestic PLC ecosystem is still under construction, and the secondary development scheme for choice is limited. Three, finally In general, what users pay attention to because domestic manufacturers should work hard to learn. Talking about some domestic brands, the advantages of other people's homes have not been learned, but the sales market has a routine, but I think it should still hold the user's heart first. Don't be too entangled in the interests in front of you. We must beware of users to abandon you in minutes! However, I also believe that with the advancement of technology and the growth of market demand, domestic PLCs are expected to be applied in more fields, and gradually replaced imported brands to become the mainstream products in the field of domestic industrial control.