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A parametric diagram is a restricted form of internal block diagram that shows only the use of constraint blocks along with the properties they constrain within a context.

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Figure D.24 - Defining Fuel Flow Constraints (Parametric Diagram)
Figure D.24 - Defining Fuel Flow Constraints (Parametric Diagram) [ANNOTATED]
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OMG Systems Modeling Language (SysML) 1.6
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About Object Management Group copyright in text extracts quoted from OMG specifications for educational purposes
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INFO
NOTATION
UML keywords
Property
SysML keywords
ConstraintBlock
MD:ConstraintParameter
constraint parameter
constraint property
SysML Parametric Diagram
value property
The usage of a constraint binds the parameters of the constraint, such as F, m, and a, to specific properties of a block, such as a mass, that provide values for the parameters.
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A parametric diagram is a restricted form of internal block diagram that shows only the use of constraint blocks along with the properties they constrain within a context.
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A constraint block is a block that packages the statement of a constraint so it may be applied in a reusable way to constrain properties of other blocks.
A constraint block typically defines one or more constraint parameters, which are bound to properties of other blocks in a surrounding context where the constraint is used.
A constraint property is a property of any block that is typed by a constraint block. It holds a localized usage of the constraint block. Binding connectors may be used to bind the parameters of this constraint block to other properties of the block ...
A constraint property may be shown on a parametric diagram using a rectangle with rounded corners. This graphical shape distinguishes a constraint property from all other properties and avoids the need to show an explicit «constraint» keyword. Otherwise..
Constraint blocks provide a mechanism for integrating engineering analysis such as performance and reliability models with other SysML models.
Constraint blocks can be used to specify a network of constraints that represent mathematical expressions such as {F=m*a} and {a=dv/dt}, which constrain the physical properties of a system.
Such constraints can also be used to identify critical performance parameters and their relationships to other parameters, which can be tracked throughout the system life cycle.
A constraint block includes the constraint, such as {F=m*a}, and the parameters of the constraint such as F, m, and a.
Constraint blocks define generic forms of constraints that can be used in multiple contexts. For example, a definition for Newton’s Laws may be used to specify these constraints in many different contexts.
Reusable constraint definitions may be specified on block definition diagrams and packaged into general-purpose or domain-specific model libraries. Such constraints can be arbitrarily complex mathematical or logical expressions.
The constraints can be nested to enable a constraint to be defined in terms of more basic constraints such as primitive mathematical operators.
Parametric diagrams include usages of constraint blocks to constrain the properties of another block.
The usage of a constraint binds the parameters of the constraint, such as F, m, and a, to specific properties of a block, such as a mass, that provide values for the parameters.
The context for the usages of constraint blocks shall also be specified in a parametric diagram to maintain the proper namespace for the nested properties.
A constraint block is defined by a keyword of «constraint» applied to a block definition. Properties of this block define parameters of the constraint, with the exception of properties that hold internally nested usages of constraint blocks.
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