Device and method for determining and/or monitoring a process variable of a medium

A device for determining and/or monitoring a chemical or physical process variable of a medium in a container, comprising:

• a measuring unit, which produces a first output signal, said measuring unit being assigned a first task;
• a control/evaluation unit, which further processes the first output signal of said measuring unit, said control/evaluation being assigned a second task;
• at least one, first task-identification unit;
• and
• at least one, second task-identification unit;
• said first task-identification unit identifies the task of said measuring unit, and
• said second task-identification unit identifies the task of said control/evaluation unit;
• a first coordination unit;
• a second coordination unit;
• and
• a comparison unit, with which said measuring unit and said control/evaluation unit are connected, wherein:
• via said first coordination unit, a first coding is associated with the first task of said measuring unit;
• via said second coordination unit, a second coding is associated with the second task of said control/evaluation unit;
• and
• said comparison unit compares the first coding with the second coding.

A method for determining and/or monitoring a chemical or physical process variable of a medium in a container, including a measuring unit, which produces a first output signal, and a control/evaluation unit, which further processes the first output signal of the measuring unit, the method comprising the steps of:

• performing a first task by the measuring unit;
• providing a first coding for the first task of the measuring unit;
• performing a second task by the control/evaluation unit;
• associating a second coding with the second task of the control/evaluation unit;
• comparing the first and second codings with one another;
• and
• only processing further the first output signal of the measuring unit by the control/evaluation unit in the case in which the first and second codings are identical.