What is the workflow of the DCS system? I KNOW WHAT THE DCS CONTROL SYSTEM HAS AI AO DI DO I O

DCSDCS, the so-called distributed control system, or distributed system in some data, is a new type of computer control system relative to the centralized control system, which is developed and evolved on the basis of the centralized control system. In terms of system functions, DCS and centralized control systems are not very different, but they are completely different in the way system functions are implemented.

Decentralized control system, remember eight words: centralized management, decentralized control.

How to form a control loop in a DCS system?

Hello! In DCS systems, (analog input), AO (analog output), DI (digital input), and DO (digital output) are commonly used control signal types. They can form a complete control loop for automated control.

The following ruler is composed of a simple control loop:1Sensors:

The physical quantity of the controlled object is converted into an analog signal, for example, a temperature sensor converts the temperature into a voltage signal. 2.Modules:

Convert the analog signal output from the sensor into a digital signal, such as the voltage signal output by a temperature sensor into a digital signal. 3.Controller:

The signal output by the module is received, and the control signal is calculated according to the preset control algorithm. 4.AO Module:

Convert the digital signal output from the controller into an analog signal, such as converting the current signal output from the controller into the opening of the control valve. 5.Actuator:

According to the analog signal output by the AO module, the state of the controlled object is controlled, such as the opening of the control valve. 6.DI module material defeat:

Detect the status of the actuator, e.g. if a valve has been opened. 7.do module:

According to the signal of the DI module, the status of the output equipment such as alarm and indicator light is controlled, for example, when the valve is opened, the control indicator light is on. The above is a simple control loop composition, through the cooperation of , ao, di and do modules, the automatic control of the controlled object is realized.

1. When part of the operator station fails, other operator stations should be used to continue to undertake the unit monitoring task (at this time, major operations should be stopped), and at the same time, quickly contact the thermal engineer to eliminate the fault, if the fault cannot be eliminated, it should be dealt with according to the current situation. 2. When all operator stations fail (all upper computers have a black screen or crash), if the main backup hard manual operation and monitoring instrument are available and can maintain the normal operation of the unit, the manual communicator can be changed to a manual beam sail, and the backup operation mode can be switched to operation, and at the same time the fault is eliminated and the operation mode of the operator station is restored, otherwise the furnace should be stopped immediately (if there is no reliable backup operation monitoring means, the furnace should be stopped). 3. After the operation of a project is completed, you should move the mouse to the blank space of the screen and click on the slag spring, and do not put it at the original operation point to prevent misoperation.

4. After switching to other operator station screens, the operator must operate to return to the original screen (who operates the switch, who operates the return) to prevent misoperation. 5. When the operator turns the historical record as a running reference, he is allowed to turn it for two days. 6. When running night shift personnel and shifting shifts, the operator shall not set the opening operation project of each electric door and ESC door to avoid the phenomenon of full opening and closing of the electric door and ESC door.

7. The operation operator shall not delete the operation history without permission. 8. When the thermal security power supply is interrupted, the UPS power supply is automatically put into operation in time, and the DCS cannot realize the remote control operation, the operator immediately changes the automatic mode to the manual mode and operates the electric door and ESC door on the spot.

1) The distributed control system (DCS) and the distributed control system (TDCS) are monitoring technologies that integrate 4C (Communication, Computer, Control, CRT) technology in a one-state cavity. (2) A large topological system from top to bottom, in which communication is the key. (3) PID is in the interrupt station, and the interrupt station is connected to the computer and the field instrumentation and control device.

4) It is a tree-like topology and parallel continuous link structure, and there are also a large number of cables in parallel from the relay station to the field instrumentation. Sail (5) Analog signal, a d—d a, hybrid with microprocessor. (6) A pair of lines of an instrument is connected to IO, and the control station is hung to the LAN LAN

7) DCS is a three-level structure of control (engineer station), operation (masking operator station), and field instrument (field measurement and control station). (8) The disadvantage is that the cost is high, the products of each company are not interchangeable, can not be interoperable, and the large DCS system is different from each other. (9) It is used for large-scale continuous process control, such as petrochemical, etc.