The types of PLC outputs include relay output, transistor output, and thyristor output.
Input unit:
The input unit is the input interface connected 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 control components and detection components. The input types of include DC input, AC input, and AC-DC input.
Output unit:
The output unit is also the connecting component between the PLC and the controlled equipment. Its function is to transmit the output signal of the PLC to the controlled equipment, that is, to convert the weak current signal sent by the central processing unit into a level signal and drive the execution components of the controlled equipment. The output types include relay output, transistor output, and thyristor output.
In addition to the above-mentioned components, PLC also has various external devices depending on the model, which help with programming, monitoring, and network communication. Common external devices include programmers, printers, cassette tape recorders, computers, etc.
