PLC installation technique key points: power -

PLC system with the rapid development of widely used, have do not need to say any more, since the alternative relay, PLC system soon established in the field of industrial automation control response, more widely in the form of discipline in colleges and universities of professional education, but still some knowledge about the PLC is to constantly accumulated in practice, especially on the installation of PLC system, looks be like simple, nature has many need to pay attention to. Today, widely into the PLC old driver of science and technology, to share some of PLC power problem when installation experience for many years.

has internal and external power supply, external power supply is the external direct current (dc), we usually say that is used to provide more input signal, and the drive of output devices, everyone can according to the input circuit and output devices to choose the appropriate external power supply, so the external power supply you choice is free and reasonable.

but for internal power supply. Into the technology of PLC old driver is about to say more. PLC circuit inside the work, is the direct docking with internal power supply, internal power performance quality, directly affects the stability and reliability of PLC, it can be said that the internal power supply is the job of the PLC, therefore, if want to let oneself of PLC and efficient work, high quality internal power supply is not less. At present, the PLC internal power supply used more switch regulated power supply, and the original sideband low-pass filter stabilized voltage supply. If there are any interference with the stronger occasions, or requiring a high reliability of PLC, also should choose with a shield of isolation transformer, stable power supply to the PLC system.

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