S-D4008 RELIANCE ELECTRIC
Mainframe control points are generally more than 1000 points. Like OMRON. The large configuration of CS1H machine can reach 5000 points. Mitsubishi Q series machine, control points can also reach 8192 points.
Super large machine control points can reach 10,000 points, so that tens of thousands of points, 100,000 points, hundreds of thousands of points. For example, the 90-70 machine of GE in the United States can reach 24,000 points, and there can be 8,000 analog channels. The S7-417-4 machine has control points up to 128K switch input, 128K switch output, or 8K analog input and analog output.
It should be said that the above division is not strict, only general, the situation introduced will change, the purpose is only to help readers establish the concept of control scale, so as to facilitate the future system configuration and use.
3. According to the structural characteristics:
Can be divided into box type and module type. Recently, there are also interpolating plates.
Box type PLC: The power supply, memory, I/O system are integrated in a small box. A host box is a complete PLC, which can be used to achieve control. The miniature and minicomputer are mostly box-type.
In order to facilitate the system configuration, some main boxes can also add interpolation options, such as communication interface options, memory options, analog input options, etc., to provide convenience for users who want to enhance the functions of the main box.
In addition, there are expansion boxes. The expansion box looks similar to the main box, but generally only the I/O system and power supply (some do not, and the power supply can be provided by the main box). Some have other functions.
If the control points of the main box are not required or the function is insufficient, the expansion box can be connected. If the number of points is not enough after an expansion box, it can also be connected to several expansion boxes.
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