这种系统的被控对象通常是数台机器或数条流水线构成， 该系统的控制单元由

The controlled object of this system is usually composed of several machines or several pipelines. The control unit of this system is composed of a single PLC, and each controlled object is connected to the I / O designated by the PLC. Since a PLC is used for control, the data and status between the controlled objects do not need additional communication lines. However, this system also has a disadvantage. If the PLC fails, the entire system will stop working. For large centralized control systems, redundant systems are usually used to overcome the above shortcomings.

The accused objects of such a system are usually composed of several machines or several assembly lines, and the control unit of the system consists of a single PLC, each of which is connected to the PLC-specified I/O. Because of the use of a PLC control, therefore, the data and status between the accused objects do not require additional communication lines. However, there is also a drawback to this system, which stops working if the PLC fails. For large centralized control systems, redundant systems are often used to overcome these shortcomings.

The controlled object of this system is usually composed of several machines or several pipelines. The control unit of this system is composed of a single PLC. Each controlled object is connected with the I / O specified by the PLC. Due to the use of a PLC control, therefore, the controlled object data, state does not need another communication line. However, this system also has a disadvantage. If the PLC fails, the whole system will stop working. For large-scale centralized control system, redundancy system is usually used to overcome the above shortcomings.