大象传媒

Systems

Inputs, outputs and processes in systems used by designers

The systems approach

Systems are often designed using a system block diagram that considers the of a system:

A block diagram of the systems approach, showing the input sending a signal to the process, which in turn sends a signal to the output.

How the system will work is the and the is the part of the system that enables the process to start happening. They work together by sending signals to each other to make something happen. There can be more than one element in each section:

  • input - starts the process
  • process - the thought process in the middle
  • output - the response or outcome

For example, a system diagram for a vending machine would be:

A block diagram of the system of a vending machine, showing the coin slot as the input, the coin counter as the process and the drinks dispenser as the output.

Communicating systems

There are several ways to communicate systems effectively.

Block diagrams

are clear, simple diagrams showing all of the input, process and output elements that make up the system being designed. They are easy to read and show how the circuit will work.

Below is an example of a block diagram for a radiator:

A block diagram of a simple open loop system for a radiator, showing an on-off switch passing electricity to a boiler and pump that passes hot water to the radiator.

Flowcharts

are clear diagrams showing the individual steps that will take place in the process. They can be handwritten but are commonly used electronically within software to control a system on a computer. The shapes of the boxes always show a specific purpose:

Flowchart symbols. Oval represents start/end, parallelogram input/output, diamond, decisions, rectangle is processes and arrow is a connector showing relationships between shapes.

Circuit diagrams

use simplified universal symbols to represent the electronic circuit and its components. A circuit diagram shows how the components are connected. The diagrams are understood across the world so others can follow them and make the same circuit.

A table showing a variety of electronic components and their related electronic symbol for use in circuit diagrams.

They are a graphical representation of how the electronic circuit has been joined:

A schematic of a simple circuit showing how different components are connected together, including a battery and a switch.