Abstract: A computer controlled sheet-fed offset printing machine is described which includes an Interpreter-program for obtaining an image of the signal-state of specified interfaces of the many interfaces that are needed for the operation of the computerized printing press. The Interpreter-program has access to a reserved region of memory for storing and manipulating, if desired, the image of the signal-state. Furthermore, the Interpreter-program has very limited and defined access to the inputs and resources used by the control programs used to operate the computerized printing press. This ensures that the control programs can execute in real-time unaffected by the execution of the Interpreter-program while data is acquired by the Interpreter-program while the computerized printing press is in operation. The Interpreter-program can execute diagnostic routines and provide data for detecting and correcting errors that are otherwise hard to localize in a complex system with complex software.

Abstract: A maintenance and diagnostic system for a printing machine, preferably a sheet-fed offset printing machine, includes a control system having at least one computer and is connected to signal transmitters that are sensors and/or limit switches. The main drive and other drives of the printing machine are activated via the sensors and/or limit switches. The control system is operatively connected to a control-desk computer containing data on print jobs that are carried out. The control system is arranged to provide a diagnostic and inspection system for printing machines to be used for planning necessary maintenance work in advance to the greatest possible extent such that the downtimes of the printing machine required for maintenance work are minimized. The control system includes a maintenance and inspection computer which is operatively connected to the control system and to the control-desk computer. Signals can be recorded by the control system onto the maintenance and inspection computer.