Control Systems <ul><li>A control system usually consists of a processor, a control program, interfaces and a device under the processor's control. The processor sends control signals through an output port which allows for: -different types of signal; -different types of cable connection. </li></ul>
<ul><li>To carry out tasks, the controlled device contains any of: -a relay, which is a switch operated by an electrical signal; -an actuator , which is a device to produce movement when given an electrical signal; - motors to produce large-scale movements. </li></ul>
A Simple Control System Computer Output Port Joining Cable Control Signal Actuator
Stepper Motor <ul><li>A stepper motor is a type of motor which needs to be sent repeated pulses to keep it going. A stepper motor has the advantage of precise control. </li></ul>
Interfaces <ul><li>An interface is used to connect two devices or systems to enable them to communicate . </li></ul><ul><li>Control systems often need to include: -analogue-to-digital (A-D), or </li></ul><ul><li>-digital-to-analogue (D-A) converters. </li></ul>
Sensors <ul><ul><li>A sensor is a monitoring device which sends signals back to the processor via an input port. </li></ul></ul><ul><ul><li>There are many types of sensor: -a thermocouple for measuring temperature; -a pressure pad </li></ul></ul><ul><li>-an infra-red sensor -an analogue light sensor </li></ul>
Feedback <ul><li>Feedback means using output from a system to affect the input. </li></ul>
Process Control <ul><li>Process control means automatic control of an industrial process </li></ul>
Robots <ul><li>A robot is a device programmed to do work otherwise done by people. An android is a robot which looks like a human being. Robots which move may use wheels, caterpillar tracks or legs. Sensors installed in a robot allow feedback and improve safety. </li></ul>
Datalogging <ul><ul><li>Data logging is automatic recording of data as it is produced. </li></ul></ul><ul><ul><li>Data acquisition is capture and storage of data for data logging. </li></ul></ul><ul><ul><li>Data logging systems may display results continually and/or analyse them later . </li></ul></ul>
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