3096-1000 KOYO

and register, all of which are concentrated on a single chip and connected to the input/output interface circuit of the memory through an address bus and control bus. The role of the central processing unit is to process and run user programs, perform logical and mathematical operations, and control the entire system to coordinatestorageMemory is a semiconductor circuit with memory function, which is used to store system programs, user programs, logical variables, and other information

The system program is a program that controls the PLC to achieve various functions, written by the PLC manufacturer and solidified into read-only memory (ROM), which cannot be accessed by users.input unit

The input unit is the input interface between the PLC and the controlled equipment, serving as a bridge for signals to enter the PLC. Its function is to receive signals from the main command and detection components. The types of inputs include DC input, AC input, and AC/DC input.

output unit

The output unit is also a connecting component between the PLC and the controlled equipment. Its function is to transmit the output signal of the PLC to the controlled equipment, which converts the weak current signal sent by the central processing unit into a level signal and drives the execution components of the controlled equipment.

The types of outputs include relay output, transistor output, and crystal gate output.

In addition to the above components, PLC also has various external devices according to different models, which are used to assist in programming, monitoring, and network communication. Commonly used external devices include programmers, printers, cassette tape recorders, and computers