The composition of PCBCS and its openness

The PCBCS control system is mainly composed of three parts: PC; Intelligent or non-intelligent I/O components; Application-specific software. PC generally refers to industrial PC, and sometimes may be ordinary PC, depending on the working environment. PC is the core of the entire control system, with data processing, access to data information, send control signals, and other PC communication and operation display and other functions. I/O components generally refer to control terminals, data acquisition terminals and their connectors. These components are mainly used in the field environment, and are the peripheral structure of the whole control system, including not only ordinary I/O ports, but also some intelligent terminals, even small PLC, and so on, which control the whole automated production line. Specific application software installed in THE PC, command and coordinate the entire control system can work stably and effectively, compared to the hardware circuit becomes simple and modular, the hardware cost is greatly reduced, the application software programming becomes relatively complex.

First, the system cost is greatly reduced

With the rapid development of large-scale integrated circuits and the rapid development of computers and the substantial improvement of various performances, the price of PCS has become very low. Compared with the man-machine interface (HMI) such as microprocessor and PLC, PC has a great cost performance ratio. Moreover, compared with PLC, DCS, FCS, etc., PCBCS control system is incomparable in data processing speed and mass storage. Investment in related signal acquisition and processing board, power supply, rack, cabinet, wiring and other aspects will also be greatly reduced. The low cost, high speed, easy operability on the basis of application software and human-machine interface of PC are beyond the reach of PLC and other control equipment. Serial bus is also adopted, and different fieldbus devices can be easily connected to PC, which can be processed by application software. The complex connection between previous devices is discarded, and the cost of equipment is also greatly reduced. For the simple equipment without intelligence and digitization, it can also be directly connected with PC and communicate with PC with analog signal (through processing board card).

The processing speed and communication speed are very fast, and the information storage capacity is large

PC has high-speed processing speed, reliable operation platform, mass storage, networking, intelligent and other related advantages. When data processing (such as analog computation), PC computing speed is usually more than 100 times that of PLC and DCS. And the storage capacity of PC is very large, the access of system related data is very convenient.

It is easy to combine process control, batch control and motion control into one

Production automation requires a high degree of integration of the entire control system to ensure the coordination of the entire production system. PC can be specially designed multi-channel input/output interface card will be a lot of analog, digital, pulse, switch signal acquisition and processing, such as through PC high-speed processing, good high speed of a production line process control in the system, a motion control of the actuator, and the multiple components of batch control and logical control.