Dave's ESL Cafe's Student Discussion Forums

[black sea]

How are you all


I have 2 Questions ... if you knows these answers could sends for me please , I need it for my project , and if you find websites give it for me


What is a digital controller system?

and what are it's major components??




I'm waiting for yours help , please don't make me feel disappoint :cry

:

[Corey]

I'm not an engineer but it sounds like a digital controller system is a type of computer that controls other machines.

If I am correct about that, then I would assume the controller is made of a processor chip, a monitor, some kind of output mechanism like a servo and man be some other things.

Good luck,

Corey
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[chai3720]

Google can help you

[jiawen]

http://en.wikipedia.org/wiki/Digital_control

[PeterAlex]

What is Control?
The process of controlling an HVAC system involves three steps. These steps include first measuring data, then processing the data with other information and finally causing a control action. These three functions make up what is known as a control loop. An example of this process is depicted in Figure 1.

Controller
The controller processes data that is input from the sensor, applies the logic of control and causes an output action to be generated. This signal may be sent directly to the controlled device or to other logical control functions and ultimately to the controlled device. The controllers function is to compare its input (from the sensor) with a set of instructions such as setpoint, throttling range and action, then produce an appropriate output signal. This is the logic of control. It usually consists of a control response along with other logical decisions that are unique to the specific control application. How the controller functions is referred to as the control response. Control responses are typically one the following:

Two-Position
Floating
Proportional (P only)
Proportional plus Integral (PI)
Proportional plus Integral plus Derivative (PID)