What is the non perturbation switching of the controller

The non-perturbation switching of the controller is manual and automatic switching instantaneously, keeping the controller's.

Output signal. No abrupt changes to avoid interference with the control system.

In the automatic state, the manually given value of the valve position should change with the change of the valve position feedback value of the on-site regulating valve; In the manual state, the setting value changes according to the change of the real-time measured value of the variable to be adjusted.

The controller is a combination of logic controller and microprogram controller, and both controllers have their own advantages and disadvantages. The combinatorial logic controller is cumbersome to design, complex in structure, and once the design is complete, it can no longer be modified or expanded, but it is fast. The microprogram controller is convenient in design, simple in structure, easy to modify or expand, and only needs to reprogram the corresponding microprogram to modify the function of a machine instruction;

Extended Information: Basic Functions of the Controller.

1. Data buffering: Because the rate of the IO device is low and the rate of CPU and memory is very high, a buffer must be set in the controller.

2. Error control: The equipment controller is also responsible for error detection of the data transmitted by the IO equipment.

3. Data exchange: This refers to the data exchange between the CPU and the controller, and between the controller and the device.

4. Status description: The status controller that identifies and reports the status of the device should record the status of the device for the CPU to understand.

5. Address identification: Just as every unit in memory has an address, every device in the system also has an address, and the device controller must be able to identify the address of each device it controls.

6. Receiving and identifying commands: The CPU can send a variety of different commands to the controller, and the device controller should be able to receive and recognize these commands.

What exactly is perturbation?

It depends on who you control, for example, if you're controlling the temperature, then the change in the outside temperature is a perturbation.

After the regulator performs the state transition, the output value does not jump, that is, there is no impact on the state transition.

At the moment of switching, the output of the controller should be kept unchanged, so that the position of the actuator will not change during the switching process, and will not cause additional disturbance to the production process, which is called non-disturbance switching.

At the moment of manual and automatic switching, keep the output signal of the controller without sudden change, so as not to interfere with the control system by switching.

There is no immediate large change in the signal when switching.