Signal processing method

Abstract

The invention relates to a signal processing method which comprises the following steps: a controller sends a first request signal to a first instruction unit and starts the first instruction unit; the first instruction unit performs a first slave station data operation according to a preset first slave station parameter and outputs a first execution completion signal; the controller starts a first time delay unit, and the first time delay unit performs first timing according to a preset first duration; and when the first timing reaches a first duration, the controller closes the first requestsignal and the first execution completion signal, sends a second request signal to a second instruction unit, and starts the second instruction unit. According to the invention, the delay unit is added to solve the overtime phenomenon in the communication process and increase the reset of the output signal of the instruction units to solve the misoperation and 485 signal interference in a peripheral equipment response process, so that a stable and reliable multi-site communication method is realized, and the stable reading and writing of physical quantities of a plurality of peripheral equipment are realized.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a signal processing method. Background technique [0002] PLC (Programmable Logic Controller, Programmable Logic Controller) is a digital operation controller with a microprocessor for automatic control, which can load control instructions into memory at any time for storage and execution. The programmable controller is composed of CPU (central processing unit, central processing unit), instruction and data memory, input / output interface, power supply, digital-to-analog conversion and other functional units. Communication with multiple peripheral devices such as temperature modules, humidity transmitters, and frequency converters can be realized through programming. The purpose is to realize PLC reading and writing of physical quantities related to multiple peripheral devices, such as temperature, humidity, frequency, etc. [0003] In the process of reading multiple perip...

AI Technical Summary

Problems solved by technology

[0003] In the process of reading multiple peripheral devices, the method of polling communication is usually used. When the number of peripheral devices does not exceed 5, the communication is basically normal. When the number of peripheral devices exceeds 5, due to the timeout phenomenon in the communication process As well as the malfunction of some peripheral devices during the response process and the interference of 485 signals, etc., some peripheral devices will not be able to read and write during the communication process, and some error messages will appear at the same time, resulting in failure to communicate with peripheral devices

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