A PLC information transfer method, memory, PLC and system

Abstract

The invention discloses a PLC information transfer method, memory, PLC and system. The method includes the following steps: S1. PLC establishes a variable group for each station; S2. When the station is in operation, write the operation result data into The variable group corresponding to the station; S3. When the station is transferred to the next station by the object after the operation, assign the data of the variable group corresponding to the station to the variable corresponding to the next station Group. The invention has the advantages of effectively reducing the number of information interactions between the PLC and the upper computer, preventing process jams caused by network interruption, abnormal communication, packet loss, etc., improving the operating efficiency and stability of the program, and facilitating failure problems.

Description

technical field [0001] The invention relates to the field of industrial automatic control, in particular to a PLC information transfer method, a memory, a PLC and a system. Background technique [0002] In the industrial automatic control production line, the data information of each station is usually acquired by the PLC, and the acquired data information is uploaded to the host computer and written into the database. However, in the existing control process, the PLC needs to perform multiple data information interactions with the host computer. Take the bottling process of the bottling line of the automatic sample preparation system as an example to illustrate, as follows: figure 1 As shown, in the bottling process, the following situations are often encountered: the sample bottle is sampled at the sample receiving station 1, indicating that all the samples have entered the sample bottle, and the sample type of the bottle of coal sample can be obtained at this station ( ...

AI Technical Summary

Problems solved by technology

In the actual application process, the following problems are often encountered: Since the automatic sample preparation system often prepares samples continuously, each coal sample has 1-3 full water samples, 1-2 storage and inspection samples, and 1-3 analysis In the same way, there are often several bottles on the bottling line at the same time. In actual situations, it often happens that there are sample bottles from station 1 to station 4.

[0010] 1. The interaction between the PLC and the upper computer is too frequent, and each station has data interaction and response. In practical applications, network interruption, communication abnormality, packet loss and other phenomena often occur, causing the process to be stuck

[0011] 2. The upper computer establishes a queue at each station, and then takes out the corresponding sample data from each station after the capping is successful. The algorithm is more complicated, the program operation efficiency is not high, and queue errors are prone to occur.

[0012] 3. It is difficult to check the cause of the problem: when encountering a problem, it is difficult to distinguish whether it is the problem of the PLC or the problem of the upper computer, and it is also troublesome to check the queue information of each station. This method of sample information transmission with a high degree of coupling When encountering problems, there is often no way to find out

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