Business overview

This section provides a business level overview of this capability.

A state of someone or something, is referring to the condition they are in or what they are like at a particular time.

State definition defines the types of states that can, or can be expected to, exist.

Information model overview

This section provides an overview of the information model that supports this capability.

Basic constructs

The state type capability is based on the State definition module for which there are three basic constructs:

• State_definition - defines a type of state that can be, or can be expected to exist;
• State_definition_relationship - defines an association between two or more state definitions;
• Applied_state_definition_assignment - defines the entities that can be, or can be expected to be, in the defined state.

NOTE    A relationship between state definitions could be specialized to describe:

• State_transition_definition - defines a transition between two state definitions;
• State_symptom_definition - defines that one state definition is the symptom of (indicates) the existence of something else;
• State_cause_effect_definition - defines define a causal relationship between two state definitions. This relationship could be specialized into Xor_state_cause_effect_definition, Or_state_cause_effect_definition, and the And_state_cause_effect_definition;
• Sequence_of_state_definition - defines a sequence of two state definitions;
• Composition_of_state_definition - defines that two or more State definition entities act as parts to compose a whole;
• State_subset_definition - defines a relationship between two sets of state definition entities;
• State_proper_subset_definition - defines a relationship between two sets of state definition entities;
• State_complement_definition - defines the complement of a set of state definition entities relative to a set of state definition entities that are the universe.

Decription of a state type

A state type is represented as a State_definition entity. The name and description of a state type should be defined as reference data being assigned to the State_definition representing the state type. The representation and assignment of reference data is described in the C010: assigning_reference_data capability.

Figure 1 —  Example of how the capability 'representing a state type' can be used to represent failure mode and functional failure as well as the relationship between those state types

Definition of state type

A state type is defined by a condition, or a set of conditions, to which someone or something has to comply in order to be in the defined state.

The condition should be and assigned to the State_definition using the constructs of the C026: representing_condition capability.

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Figure 2 —  Example of state type definition using the 'representing a condition' capability

State definition relationship

A state definition relationship can be classified using the C010: assigning_reference_data capability.

Applied state definition assignment

The model allows for two different ways to descibe the purpose of a State_definition assignment:

• use the role attribute of Applied_state_definition_assignment. This approach should NOT be used;
• use of Classification_assignment in accordance with the C010: assigning_reference_data capability. This approach should be used.

NOTE    Enumeration of entity types that a State_definition can be assigned to is outside the scope of this capability.

Characterization of state type

No further characteization of State_definition, State_definition_relationship and Applied_state_definition_assignment is needed to enable this capability.

Capability templates

The following sections define a set of templates for the capability, where a template is a specification of a set of entities that need to be instantiated to represent a given set of information.

This section specifies the template assigning_state_type.

NOTE  An explanation of a template and the associated instantiation path is provided in the Template overview section.

Figure 1 —  An EXPRESS-G representation of the Information model for assigning_state_type

Figure 2 —  The graphical representation of the assigning_state_type template

Figure 3 —  Entities instantiated by assigning_state_type template

#1 = PART('/IGNORE','/IGNORE','/IGNORE');
#3 = STATE_DEFINITION('/IGNORE','/IGNORE');
#4 = STATE_DEFINITION_ROLE('/IGNORE','/IGNORE');
#5 = APPLIED_STATE_DEFINITION_ASSIGNMENT(#3,#1,#4);
#7 = CLASSIFICATION_ASSIGNMENT(#9,(#3),'/IGNORE');
#9 = EXTERNAL_CLASS('/NULL','Corrosion','/IGNORE',#10);
#10 = EXTERNAL_CLASS_LIBRARY('urn:plcs:rdl:sample',$);
#12 = CLASSIFICATION_ASSIGNMENT(#14,(#5),'/IGNORE');
#14 = EXTERNAL_CLASS('/NULL','Possible_state','/IGNORE',#10);
        

Figure 4 —  Instantiation of assigning_state_type template

This section specifies the template representing_state_type.

NOTE  An explanation of a template and the associated instantiation path is provided in the Template overview section.

Figure 1 —  An EXPRESS-G representation of the Information model for representing_state_type

Figure 2 —  The graphical representation of the representing_state_type template

Figure 3 —  Entities instantiated by representing_state_type template

          #1 = STATE_DEFINITION('/IGNORE','/IGNORE');
          #2 = EXTERNAL_CLASS_LIBRARY('urn:plcs:rdl:sample','/IGNORE');
          #3 = EXTERNAL_CLASS('/NULL','Engine_overheated','/IGNORE',#2);
          #4 = CLASSIFICATION_ASSIGNMENT(#3,(#1),'/IGNORE');
        

Figure 4 —  Instantiation of representing_state_type template

Related capabilities

This capability "Representing State Type" is related to the following capabilities:

• C041: representing_state_observed

Dependent capabilities

This capability "Representing State Type" is dependent on the following capabilities:

• C010: assigning_reference_data
• C026: representing_condition

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