PLC operation data recording method based on master-slave station communication mode

Abstract

An embodiment of the present invention provides a PLC operation data recording method based on a master-slave station communication mode, including: periodically sending a channel status monitoring data frame to the target PLC; if the channel status response is received within the preset time data frame, 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 master-slave communication mode and recorded. The PLC operation data recording method based on the master-slave station communication mode provided by the embodiment of the present invention realizes the anti-tampering recording and transmission of the key operation accumulation data even in places without network coverage; without changing the original program of the PLC 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 master-slave 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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Problems solved by technology

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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