型号:3HAC4776-1/1
品牌:ABB
工作环境是PLC工作的硬指标。自控系统将人们从繁忙的工作和恶劣的环境中解脱出来,就要求自控系统能够适应复杂的环境,诸如温度、湿度、噪音、信号屏蔽、工作电压等,各款PLC不尽相同。一定要选择适应实际工作环境的产品。
现在PLC已不是简单的现场控制,PLC远端通信已成为控制系统必须解决的问题,但各厂家制定的通信协议千差万别,兼容差。在这一点上主要考虑以下方面:
1、同一厂家产品间的通信。各厂家都有自己的通信协议,并且不止一种。这在大、中型机上表现明显,而在小、微型机上不尽相同,一些厂家出于容量、价格、功能等方面考虑,往往没有或者有与其它协议不同,而且比较简单的通信。所以,在这方面主要考虑的是同一厂家不同类型PLC之间的通信;
2、不同厂家产品间的通信。若所进行的自动控制系统设计属于对已有的自控系统进行部分改造,而所选择的是与原系统不同的PLC,或者设计中需要2个或2个以上的PLC,而选用了不同厂家的产品,这就需考虑不同厂家产品之间的通信问题;
3、是否有利于将来。由于各厂家制定的通信协议各不相同,国际上也无统一标准,所以在PLC选型上受到很大限制。就要考虑影响面大、有发展的、功能完备、接近通用的通信协议。
Working environment is a hard indicator of PLC work. Automatic control system will free people from busy work and harsh environment, it requires that the automatic control system can adapt to 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.
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, 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 the choice of different manufacturers of products, which needs to consider the communication between different manufacturers of products;
3. Is it good for the future? Due to the different communication protocols developed by various manufacturers, there is no unified international standard, so the selection of PLC is greatly limited. It is necessary to consider the communication protocol with large influence, development, complete function and close to universal.
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