Unlocking method and device based on PLC

Abstract

The invention discloses an unlocking method and an unlocking device based on PLC. The method provided by the invention comprises the steps that a touch screen acquires a triggering signal for unlocking, and the PLC generates a random password according to the triggering signal; according to the preset correspondence between the unlocking information and the random password, the PLC sends corresponding unlocking information through combining with the random password; and the touch screen acquires an unlocking password through analyzing the unlocking information by the user, the PLC matches the unlocking password with the random password and judges that whether the unlocking password is accordant with the random password, if the judgment result is yes, a lock is unlocked, and if the judgment result is no, the other unlocking password is acquired again. The device comprises a touch screen and a PLC, is the most common combination in the minitype automatic system, can complete the data collection and processing of on-site analog value / switching value, and can achieve the complex logic function data processing; and the random password function can be embedded into the device, thus the engineering cost is not further added, and the information security of the automatic system can be better achieved.

Description

technical field [0001] The present invention relates to an unlocking method and device, in particular to a PLC-based unlocking method and device. Background technique [0002] With the development of modern science and technology, people pay more and more attention to the security of their own data. Encryption technology is a commonly used means of security and confidentiality, and passwords are used to protect their data security. [0003] In the operation of industrial products, it is often necessary to perform mandatory shutdown operations on the products operated by users on site, such as final payment, regular maintenance of equipment, and regular parameter modification. When the device is shut down regularly, a password is required to unlock it before it can be restarted. [0004] Traditionally, there are fixed passwords in industrial products. Every time the user enters the password, the input process is the same, and it is easy to leave the same trace on the devic...

Images