Concept of education

Control systems must achieve the following objectives:

January. Be stable and robust to disturbances and model errors.

2. Be efficient as a pre-determined criteria to avoid abrupt and unrealistic behavior.

Need for process monitoring:

Limitations of visualization of the acquisition and control systems.

Control vs. Monitoring

Control software. Close loop control.

Collect, store and view information.

Data Mining.

open loop control system features:

• Be simple and easy concept.

• Nothing ensures its stability to a disturbance.

• The output does not compare with the input.

• Be affected by disturbances. These can be tangible or intangible.

• The accuracy depends on the previous calibration of the system.

The closed-loop control is required when any of the following circumstances:

- When a process is not possible to regulate by man.

- A large-scale production requires large facilities and the man is not capable of.

- Monitor a process is particularly harsh in some cases and requires attention that man can easily lose by fatigue or forgetfulness, with consequent risks that may cause the worker and the process.

Its features are:

• Be complex, but large in number of parameters.

• The output is compared with the input and affects the control of the system.

• His ownership of feedback .

• Be more stable to disturbances and internal variations.

characteristics of a control system:

1. Signal Input Current: Considered as a stimulus applied to a system from an external power source in order that the system produces a specific response.
2. Signal Output Current: Response obtained by the system that may or may not relate to the response that involved the entry.
3. Manipulated Variable: The element to which it changes its magnitude, to achieve the desired response. That is, it manipulates the process input.
4. Controlled Variable: It is the element to be controlled. You could say that is the output of the process.
5. Conversion: By receptors are generated by variations or changes that occur in the variable.
6. External Changes: These are the factors that influence the action of producing a change in the correct order.
7. Power Supply: It is what delivers the energy needed to generate any kind of activity within the scheme.
8. Feedback: Feedback is an important feature of the systems closed loop control. It is a sequential relationship of cause and effect between the state variables . Depending on the corrective action taken by the system, this can support a decision or not, when the system is said to produce a return that is a negative feedback, if the system supports the initial decision is said to have positive feedback.
9. Phase variables: These are the variables that result from the transformation of the original system to the controllable canonical form. This yields also the controllability matrix whose rank order should be completely to control the system.