PLC programming for control management system and DCS control information system design is not a concept on the logical level of students. It can be seen from the name: PLC programming control environment system is mainly named after social functions, and DCS is named after economic system development structure name. The automation control cabinet refers to the programmable control cabinet, and the control cabinet refers to a complete set of control cabinets, which can realize the control of motors and switches. The energy management system of the electrical cabinet has a 24VDC switching power supply. Most PLCs have their own 24VDC power supply. Whether you want this switching power supply depends on whether you really need it. Environmental conditions of industrial automation company: the ambient temperature is 0°C-55°C, avoid direct sunlight; the relative humidity of the air should be less than 85% (no condensation). Keep away from strong vibration sources and prevent frequent or continuous vibrations with a vibration frequency of 10-55HZ. Avoid corrosive and flammable gases. In principle, the plc programming control network system can form a DCS. Of course, the performance difference between the two still exists in the enterprise, depending on the product and needs. From the perspective of applied research, it is often misunderstood to simply distinguish between PLC and DCS.

The difference between plc programming control management system and dcs control information system: DCS is a "distributed control technology system", while PLC (programmable logic controller) is only an effective control "device". " and "device" difference. System analysis can realize the function and social coordination of any device in the enterprise, and the PLC device only realizes the functions possessed by this unit.

The DCS network is the central nervous system of the whole system and is an international standard protocol TCP/IP. A safe and reliable dual-redundant high-speed communication network is commonly used in the DCS system, and the system has good scalability and openness. Since PLC basically works for a single small system, when communicating with other PLC programming control systems or upper computer control systems, the network form is basically a single network structure, and the network protocol is often inconsistent with international standards. PLC does not have good protection for network security .

The overall consideration of the DCS scheme, the operator station has the function of the engineer station, and the installation of the station and the station under the operation plan program is a close connection relationship. Any station, any function, and any controlled device are interlocked control, coordinated control and In the single-use PLC interconnection system, the station-to-station (PLC and PLC) connection is a loose connection method, which cannot perform the function of coordinated control.

DCS has a large number of expandable interfaces in the entire teaching design. It is very convenient to connect external systems or expand information systems. After the completion of the entire social system that is connected to the control management system by PLC programming, you can increase or decrease operations at will. It is very difficult for us to achieve the staff station.

In order to ensure the safety and reliability of the DCS control equipment, a dual redundant control unit DCS is used. When an important control unit fails, the relevant redundant unit will be switched to the working unit in real time without interference to ensure the safety and reliability of the entire system. Overlapped systems need to be configured with dual PLCs for redundancy.

After updating the DCS of various process control plans, when a program is changed, the engineer only needs to compile the changed basic functions in the chief engineer of the program and execute the command to download it. The download process is automatically completed by the white system without affecting the original Control program runs. System software and various control algorithms can improve the accuracy of process control objects.

For the development of the system composed of PLC, the workload is extremely huge. First, we need to determine which PLC we want to update by editing technology, and then the teacher can use the corresponding compiler to compile the analysis program, and finally use the special The machine (reader) one-to-one transmits the program to the plc programming to realize the control management system. During the debugging of the system software, a large number of enterprises increase the debugging time and the cost of the debugging environment, and it is extremely unfavorable for future maintenance.