A numerical control system includes a computer aided design (CAD) data storage means for storing CAD data, an input/output (I/O) assignment data storage means for storing I/O assignment data, and a relevant information storage means for recording relevant information between the I/O assignment data and mounting information included in CAD data of each of the I/O units, and displays a defect occurrence region on a shape image of a control panel.

A method for stipulating a starting time for an update for a control apparatus that controls at least one peripheral component in a process automation installation by producing control outputs is disclosed. The update requires at least one predetermined down time. The invention is based on a suitable starting time for performing an update in order to perform an update in the course of operation of a process automation installation without risk. The method involves detecting a current operating state for the at least one peripheral component, taking the detected operating state as a basis for using a controlled system model of the process to simulate what state trajectory the at least one peripheral component negotiates within the down time for a predetermined static control output, and checking whether the state trajectory lies exclusively within a range of admissible operating states, and, if appropriate, starting the update.