Operator station server (15, 16) of a control system of a process engineering plant, said server having a computer-implemented process image (21, 30), wherein the computer-implemented process image (21, 30) comprises, at runtime of the process engineering plant, a first computer-implemented process object (22a, 22b, 22c, 31a, 31b, 31c), a second computer-implemented process object (22a, 22b, 22c, 31a, 31b, 31c) and further computer-implemented process objects (22a, 22b, 22c, 31a, 31b, 31c), which are each assigned to a technical object (4, 5, 6, 7, 8, 9, 10, 11, 12, 13) of the process engineering plant and are operatively connected to the same, wherein the operator station server comprises a visualisation service which is designed to transmit a symbolic system image to an operator station client for visualisation, in order to display block symbols generated from the first process object (22a, 22b, 22c, 31a, 31b, 31c) and the second process object (22a, 22b, 22c, 31a, 31b, 31c) in the system image, characterised in that the first process object (22a, 22b, 22c, 31a, 31b, 31c) has a structured and direction-oriented reference (24a, 24b, 24c, 32a, 32b, 32c) to the second process object (22a, 22b, 22c, 31a, 31b, 31c), wherein the visualisation service is designed and provided to use the structured and direction-oriented reference (24a, 24b, 24c, 32a, 32b, 32c) to determine a dependency of block symbols generated from the first process object (22a, 22b, 22c, 31a, 31b, 31c) and the second process object (22a, 22b, 22c, 31a, 31b, 31c) in the symbolic system image in order to derive a process engineering string for the system image, wherein the visualisation service is furthermore designed to also include further process objects (22a, 22b, 22c, 31a, 31b, 31c) for the derivation of the process engineering string, of which no block symbols are displayed in the system image, wherein the system images in which the further process objects (22a, 22b, 22c, 31a, 31b, 31c) are present are determined for the further process objects (22a, 22b, 22c, 31a, 31b, 31c), and wherein the visualisation service is furthermore designed to calculate and update alarms for all block symbols, and with the determined system images and alarms at runtime, to create image change buttons in the currently opened system image in order to be able to navigate from system image to system image along the derived process engineering string. wherein the operator station server comprises a visualisation service which is designed to transmit a symbolic system image to an operator station client for visualisation, in order to display block symbols generated from the first process object (22a, 22b, 22c, 31a, 31b, 31c) and the second process object (22a, 22b, 22c, 31a, 31b, 31c) in the system image, characterised in that the first process object (22a, 22b, 22c, 31a, 31b, 31c) has a structured and direction-oriented reference (24a, 24b, 24c, 32a, 32b, 32c) to the second process object (22a, 22b, 22c, 31a, 31b, 31c), wherein the visualisation service is designed and provided to use the structured and direction-oriented reference (24a, 24b, 24c, 32a, 32b, 32c) to determine a dependency of block symbols generated from the first process object (22a, 22b, 22c, 31a, 31b, 31c) and the second process object (22a, 22b, 22c, 31a, 31b, 31c) in the symbolic system image in order to derive a process engineering string for the system image, wherein the visualisation service is furthermore designed to also include further process objects (22a, 22b, 22c, 31a, 31b, 31c) for the derivation of the process engineering string, of which no block symbols are displayed in the system image, wherein the system images in which the further process objects (22a, 22b, 22c, 31a, 31b, 31c) are present are determined for the further process objects (22a, 22b, 22c, 31a, 31b, 31c), and wherein the visualisation service is furthermore designed to calculate and update alarms for all block symbols, and with the determined system images and alarms at runtime, to create image change buttons in the currently opened system image in order to be able to navigate from system image to system image along the derived process engineering string.