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1. A visualization method for process data by a visualization system, an industrial technical installation being controlled and monitored by a process control system, the method comprising: acquiring, by the process control system, at each acquisition point in time, process data and archiving the acquired process data as a history; Selecting an item of the process data; requesting, by the visualization system, the history of the selected item of process data and outputting an associated temporal curve as a graphic comprising a number of process data points to the at least one operator, upon the selection of an item of process data and a specification of an associated display period of time by at least one operator of the process control system for the predetermined display period of time; determining, by the visualization system, a respective process data point with reference to values of the selected item of process data of a respective acquisition period of time which is characteristic for the respective process data point, the acquisition period of time comprising a plurality of acquisition points in time and the respective process data point comprising a mean value or a median value of the process data of the respective acquisition period of time; determining, by the visualization system, at least one of a minimum and a maximum of values of the selected item of process data for the respective process data point during the respective acquisition period of time; checking, by the visualization system, whether at least one of (i) the minimum value which is determined for the respective process data point is below a predetermined minimum value and (ii) the maximum value which is determined exceeds a predetermined maximum value; and displaying, by the visualization system, a secondary alarm together with the respective process data point comprising the minimum and maximum values and the mean or median value, when one or both checks are positive, the secondary alarm representing an alarm which is not set by the process control system but rather is set by the visualization system; automatically and cyclically acquiring the process data, by the control system; and instructing the visualization system, by the control system, such that visualization system cyclically sets and displays the secondary alarm, based on the cyclically acquired process data, when the one or both checks are positive.
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