Method for starting up a field device in a simplified manner

A method for starting-up using a service unit a field device of automation technology mounted on a container at a measuring location, wherein the service unit includes a display unit and a camera, the method comprising:

• identifying the field device using the service unit;
• registering a reference geometry by means of the camera, wherein the reference geometry has a defined length in at least one dimension;
• creating, based on the reference geometry, a three-dimensional, polygonal network, wherein the three-dimensional, polygonal network is used to measure objects registered by the camera and to define a ruler for the objects registered by the camera and shown in an image;
• ascertaining at least one parameter to be set based on the identifying of the field device;
• showing by means of the display unit the at least one parameter to be set, wherein the display unit shows a field of view of an operator, and wherein the at least one parameter to be set is shown as at least one virtual symbol that is superimposed at least partially on the field of view shown on the display unit;
• selecting at least one predetermined parameter value, or inputting at least one parameter value;
• confirming the selected, or input, parameter value;
• and
• transferring the confirmed parameter value into the field device and storing the parameter value in the field device.