Method for monitoring a production machine and monitoring device

A computer-implemented method for monitoring a production machine, wherein, during operation of the production machine,

• a) a current operating signal of the production machine is continuously acquired;
• b) a time window wherein the respective workpiece is machined by the production machine is acquired for each of a large number of workpieces;
• c) a curve of the operating signal that is limited to the respective time window is acquired for each time window;
• d) a respective quality parameter of the respective workpiece being machined is acquired;
• e) as a result of detection of a deviation between a respective operating signal curve and a target curve, it is checked whether a fault cause is assigned to the respective operating signal curve in a monitoring database;
• and,
• if this is not the case,
• a piece of information about the respective quality parameter is output by way of a user interface together with a request to enter a respective fault cause;
• the respective fault cause is read in by way of the user interface;
• and
• the respective operating signal curve, the respective quality parameter and the respectively read-in fault cause are stored in the monitoring database in a manner assigned to one another and;
• otherwise,
• the assigned fault cause is output and/or the production machine is actuated depending on the assigned fault cause.