Since the advent of the relay in 1836, people have begun to use wires to connect it ingeniously with switching devices to form logic control or sequence control for various purposes. So far, the shadow of these wirings can still be seen in the PLC programming language – ladder diagram. Until the advent of programmable controllers in the late 1960s and early 1970s, with the rapid development of microelectronics technology, computer technology and data communication technology, as well as the emergence of microprocessors, PLC products made a leap towards miniaturization and ultra-miniaturization. Finally, the early PLC developed from the initial logic control and sequence control to a modern PLC with functions such as logic judgment, timing, counting, memory and arithmetic operations, data processing, network communication and PID loop adjustment.
Main functions of programmable controller
PLC is an industrial automation device with a wide range of applications and a very rapid development, which occupies an important position in factory automation (FA) and computer integrated manufacturing system (CIMS). Today’s PLC functions go far beyond replacing traditional relay logic.
A PLC system generally consists of the following basic functions:
A variety of control functions
Data collection, storage and processing functions
Communication networking function
Input/output interface adjustment function
Human-machine interface function
Programming and debugging functions
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