Block Diagram Components. It is used to design new systems or to describe and improve existing ones. This set of instruction is processed by the cpu after getting the input by the user and then the computer system produces the output.
In a closed loop control system a fraction of output is fed back and added to the systems input. Cpu consists of three basic units. The central processing unit cpu again consists of alu arithmetic logic unit and control unit.
The block diagram of programming logic controller plc is shown in above figure.
They can solve highly complicated problems quickly and accurately. Let us consider the block diagram of a closed loop control system as shown in the following figure to identify these elements. The block diagram of programming logic controller plc is shown in above figure. At the summing point the input signal r s will be added to b s.