| 摘要 |
Method for monitoring and assessing program variables of an industrial installation driven by a controller (C) by means of instructions programmed in a user program. Specific monitoring modules (MSI to MSt) are set up as close as possible to the variable or variables (VI to Vt) to be monitored, that is to say after and preferably immediately after the writing of the variable or variables into said user program so as to monitor their evolution in real time. During the execution of said instructions, each specific monitoring module (MSy) concerned reads in real time the logical state of each of the variables (VI to Vn) that it monitors in an instantaneous cycle round (TCi)of said controller (C), compares this logical state with that of the previous cycle round (TCi-1) previously recorded, and only in case of change of state, records the new logical state read in a global memory unit (UM G) of the controller (C) as well as the real-time time- stamping of this event. By means of dedicated assessment software a dedicated assessment apparatus is used to analyse the recorded metadata so as to control the behaviour of said installation, utilize these production data and in particular identify a possible malfunction in said user program and/or said industrial installation. |
