PLC controller is one of the very important control equipment in the field of industrial automation, it is a general-purpose controller based on computer technology. PLC controllers can be used in a variety of different industrial automation applications, including manufacturing, electric power, petrochemical, food processing, and other fields.
There are many types of PLC controllers, and there can be different types according to different classification methods. Here are some common types of PLC controllers:
1.Classified by structural form.
PLC controllers can be divided into integral and modular according to different structural forms. The integral PLC controller is to integrate the power supply, CPU, input and output interfaces, etc. in a chassis, and the operation panel is also integrated, so it is compact, small and cheap. The modular PLC controller is to separate each functional module, such as CPU module, input and output module, power module, etc., and users can combine different modules to achieve different control functions according to their needs.
2.Categorized by function.
PLC controllers can be divided into three types: low-level, intermediate-level and high-level according to different functions. Low-level PLC controllers can only implement simple logic control functions, such as switching control, sequence control, etc.;The intermediate PLC controller can realize more complex control functions, such as analog control, PID control, etc.;Advanced PLC controllers can realize more complex control functions, such as motion control, process control, etc.
3.Classified by IO points.
PLC controllers can be divided into small, medium and large according to the number of IO points. The number of IO points of the small PLC controller is generally less than 20 points, which is suitable for simple control tasksThe number of IO points of medium-sized PLC controllers is generally between 20 and 200 points, which is suitable for medium-complex control tasksThe number of IO points of large PLC controllers is generally more than 200 points, which is suitable for very complex control tasks.
4.Classification by manufacturer.
PLC controllers can be divided into a variety of brands according to different manufacturers, such as Siemens, Allen Bradley, Omron and so on. Different brands of PLC controllers are different in terms of performance, functions, etc., and users can choose the brand and model that suits them according to their needs.
The above are several common types of PLC controllers, and users need to choose the appropriate type and model according to their actual needs when choosing PLC controllers. At the same time, it is also necessary to consider the reliability, stability, maintainability and other factors of the PLC controller.