The PLC power supply is used to provide working power for the integrated circuits of each PLC module. At the same time, some also provide 24V working power for the input circuit. Power input types are: AC power (220VAC or 110VAC), DC power (commonly used for 24VAC).
backplane or rack
Most modular PLCs use backplanes or racks, and their functions are: electrically, to realize the connection between the modules, so that the CPU can access all modules on the backplane, and mechanically, to realize the connection between the modules, so that each module constitutes a overall.
Other equipment of PLC system
Programming equipment: The programmer is an indispensable device for PLC development and application, monitoring operation, inspection and maintenance. It is used for programming, making some settings for the system, and monitoring the working status of the PLC and the system controlled by the PLC, but it does not directly participate in on-site control. run. Small programmer PLC generally has a hand-held programmer, and currently a computer (running programming software) is generally used as a programmer.
Human-machine interface: The simplest human-machine interface is the indicator light and buttons. At present, the integrated operator terminal of LCD screen (or touch screen) is more and more widely used, and it is very popular to use the computer (running configuration software) as the human-machine interface. .
Input and output devices: used to permanently store user data, such as EPROM, EEPROM writer, bar code reader, potentiometer for input analog quantity, printer, etc.
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