PLC operation data recording method based on multi-master station communication mode
A technology of operating data and communication mode, applied in the direction of registration/instruction, time register, registration/instruction machine, etc., which can solve problems such as high cost, lack of secondary development ability of the lessee, complex system, etc.
Active Publication Date: 2022-02-08
山西诚鹏科技开发有限公司
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Moreover, this method also needs to configure the computer operating platform required for monitoring and configuration software
[0004] However, in practical applications, leasing of equipment with PLC as the core has become a way of equipment sharing. For this scenario, there is usually no network coverage condition. The lessor and the lessee are very concerned about the operating data of the PLC equipment. To build a corresponding communication network including the upper computer to monitor the use of PLC equipment, it is necessary to modify the source program of the PLC equipment, purchase configuration software, build a communication network, etc., and some even need to modify the source program of the PLC in the equipment, resulting in system It is very complicated, and most lessees do not have such secondary development capabilities. Even with such secondary development capabilities, the cost is very high. Therefore, there is an urgent need for a simple, tamper-proof PLC operation data recording system
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.
[0032] The multi-master communication mode refers to the communication mode in which all the devices in the network are master stations, and the "active protocol" is used for data transmission between each master station. No matter whether there are other machines accessing on the network, they are constantly sending data. Data frame, let t...
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An embodiment of the present invention provides a PLC operation data recording method based on a multi-master station communication mode, including: periodically receiving data frames fed back by the target PLC, and these data frames are used as channel state monitoring data frames; If the channel state response data frame is received within the specified time, it is determined that the data channel with the target PLC is in a connected state, and the operating data is read from the target PLC according to the multi-master communication mode and recorded. The PLC operating data recording method based on the multi-master station communication mode provided by the embodiment of the present invention realizes tamper-proof recording and transmission of key operating accumulated data even in places without network coverage; without changing the original PLC program On the basis of it, it can realize the query, accumulation, statistics and other functions of its internal data, and store it in the anti-duplication and anti-tampering CPU type IC card.
Description
technical field [0001] The invention relates to the technical field of industrial automatic control, in particular to a PLC operation data recording method based on a multi-master station communication mode. Background technique [0002] During the operation of automatic control equipment, in many applications, the charging time of programmable logic controller PLC and its control objects, high current (greater than a certain current value is regarded as heavy load, such as 5A) running time, maximum current value And other parameters are recorded and managed, which has important reference value for equipment repair and maintenance. [0003] In the existing technology, online monitoring technology is used in most scenarios to record and manage the operating data of the PLC. The online monitoring technology is to continuously or regularly monitor the operating data of the monitored equipment under the condition that the monitored equipment is running, usually automatically. ...
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IPC IPC(8): G07C3/00G08C17/02
CPCG07C3/00G08C17/02H04L43/0811
Inventor 李珺郭建鹏李瑞赵敏刘岩刘孟姣刘涛赵会刘千会
Owner 山西诚鹏科技开发有限公司