Multifunctional input/output interface board

Abstract

The invention relates to a multifunctional input / output interface board, which comprises an optoelectronic isolation input circuit, a logic control circuit, a display and communication circuit, and an output control circuit, wherein the optoelectronic isolation input circuit consists of an optoelectronic isolator and a light-emitting diode connected in series, the input end of the optoelectronic isolation input circuit is connected to an external sensor, and the optoelectronic isolation input circuit is used for performing anti-interference filtration and noise reduction treatment on input external signals; the logic control circuit receives signals processed by the optoelectronic isolation input circuit to realize input / output control; the display and communication circuit receives control signals of the logic control circuit and performs parameter configuration and communication with external equipment; and the input end of the output control circuit receives the control signals of the logic control circuit and the output control circuit outputs switch control signals to on-site external serial-port equipment. The multifunctional input / output interface board can be used for signal input of various sensors, automatic control of switch signals and communication interfaces with digital instruments on industrial site, and solves the problems that interface signal levels on the industrial site are not matched or common-grounded, interference of the various noise signals in the prior art is not eliminated, and the like.

Description

technical field [0001] The invention relates to a multifunctional input and output interface board, which is used for automatic control of various sensor signal inputs and switch signals in industrial sites and a communication interface with digital instruments. Background technique [0002] The interfaces of various switching signals in the industrial field often need to be isolated to solve the voltage mismatch between the signal source sensor and the computer, and the phenomenon of not sharing the same ground. In the actual application of the industrial field, there are various interference noise signals at the same time. If the anti-interference ability of the circuit is low, the accuracy of measurement and control will be reduced, and malfunction will occur, which will bring serious consequences. Therefore, some anti-interference design techniques can be adopted from the hardware, which can effectively improve the anti-interference ability of the industrial field equip...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the interference of various noise signals in the industrial field, the accuracy of measurement and control will be reduced, and the interface voltage between the signal source sensor and the field device will not match, and the ground will not be shared.

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