2016 November

Purpose

A purpose is an abstract description or characterization of any of a large number of situations

Objective

This objective is defined as the desired (intended) situation, in contrast, a threat which may challenge goal achievement may lead to an undesired situation. In this case, to maintain the temperature at 20°C is our desirable situation or our objective. If the temperature falls below 20°C, a threat may have disturbed the system. Such a… read more »

Goal

A goal, the final purpose is a concrete description or characterization of single situation at a point in time. One can have the goal to achieve a specific purpose. Also, the goal can be decomposed into subgoals. For example, during winter, it may be cold in a house. The purpose to keep us warm in… read more »

Operational modes

Any complex automated system has di erent operational modes, e.g. due to a start-up proce- dure required to get into the nominal operation situation, emergency modes to guarantee secure operation when shutting down, or di erent con gurations to comply with varying demands. In di erent modes components of a system can ful l di… read more »

Control functions

Besides the system inherent functions and their combination to fulfil the overall purpose of the system, any industrial plant relies on control functions to ensure the nominal operation of specic safety- or production-relevant functions. In order to be able to model a system including its control functions, Morten Lind introduced a representation of control actions… read more »

Component

In MFM the word component refers to a physical object, which is typically a part of a process system. The component could e.g. be a hydraulic pump or a valve for a hydraulic press. The component relates to the processes in a part-whole abstraction level.

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