Industrial human-machine interface variable accessing method and system

The invention discloses an industrial man-machine interface variable access method. The method comprises the following steps: selecting a current monitoring picture and displaying the current monitoring picture; extracting external variable access frequency parameters relative to the picture objects respectively in the current monitoring picture, visiting external variable regions corresponding to the picture objects respectively according to the external variable access frequency parameters and extracting relevant external variable values; storing the external variable values in a cache memory; and extracting an external variable value of the cache memory and updating the picture display of the monitoring picture in real time according to the external variable value. Accordingly, the invention also discloses an industrial man-machine interface variable access system. By adopting the technical proposals, the network resource is saved and the communication efficiency is increased.