Common control methods in industrial automation include relays,PLCTheir selection is mainly determined by factors such as control requirements, workplace and price cost. The following is a simple comparison of the advantages and disadvantages of these control methods:
    (1Relay control
    Advantages:Low cost, high on-off current, intuitive detection, listening or looking to find the fault point.
    Cons:Relying on the mechanical action of the contact to achieve control, low working frequency, short service life, inconvenient wiring change; And can only complete the established logic control, flexibility and scalability is poor; Timing accuracy is not high, easy to be affected by temperature and environment, and adjustment time is difficult.
    (2)PLCControls
    Advantages:Powerful function, cost-effective, good reliability, complete hardware, flexible programming, strong anti-interference ability, easy to expand and maintain, low environmental requirements, long service life.

    Cons:PLCThe cutting capacity is lower than that of relays, and the cost is higher.

    (3MCU control
    Advantages:Small size, low power consumption, fast running speed; With high-level language support, high programming efficiency, good portability; Economical, low cost.
    Cons:The main control board made by single chip microcomputer is easily affected by plate making process, layout structure, device quality and other factors, poor anti-interference ability, high failure rate, poor expansibility, strong dependence on the environment, and long development cycle.
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