High-low voltage signal adjustable interface circuit applied to controller

Abstract

The invention relates to the technical field of electronic circuits, and in particular relates to a high-low voltage signal adjustable interface circuit applied to a controller. The circuit comprisesa mode switching unit, a processor and a mode selection unit; the mode switching unit comprises a plurality of input interface circuits; the mode selection unit comprises a plurality of output interface circuits; and the input interface circuits and the output interface circuits are connected with the processor. According to the invention, through selection of line modes, access and output of corresponding signals can be conveniently realized, operation is convenient, and the use threshold is reduced.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an interface circuit with adjustable high and low voltage signals applied to a controller. Background technique [0002] As we all know, in the global industrial control industry, the use rate of programmable logic controller (PLC) products is about 70%, but in the PLC use alliance, it is mainly divided into Japanese (represented by Mitsubishi / Panasonic / Omron brands) and Europe PLC (represented by Siemens / AB / Rockwell brand) occupies a dominant position in the market. In the industry, the usage ratio of Japanese and European and American factions is about four to six. Among them, the input form of most products of Japanese and European and American PLCs is switchable source / sink input; but there is a big difference in the output mode (here we take transistor output as an example), the output form of Japanese PLC is Sink output / source output, one model can only corres...

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Problems solved by technology

Among them, the input form of most products of Japanese and European and American PLCs is switchable source / sink input; but there is a big difference in the output mode (here we take transistor output as an example), the output form of Japanese PLC is Sink output / source output, one model can only correspond to one type of output form, and the output interface of Siemens PLC only has source output mode

[0003] At present, in practical application, changing the properties of the common terminal can satisfy the input of different types of sensors, so the user must be required to correspond to the type of external sensor, and then select the wiring properties of the common terminal S / S accordingly, and the peripheral wiring must also be It needs to be connected according to the requirements, which will cause troubles for users, especially new users who are not very clear about the peripheral circuit, and often due to changes in the output properties of external sensors, the PLC cannot receive signals normally and the wiring of the common terminal needs to be changed; And another tricky point is that the circuit inside the PLC is realized in groups of 4 or 8 circuits, and the input form of any channel cannot be changed arbitrarily. It can only be changed in groups. The flexibility is not strong. The form is a mixture of the two types, which requires additional switching devices to transfer the signal, which is more troublesome to use

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