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Chapter 3: Block Definition Diagrams Flashcards

1
Q

What is the most common kind of SysML diagram

A

Block Definition Diagram

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2
Q

What is: Elements of Definition

A

Elements that appear on BDD’s - blocks, actors, value types, constraint blocks, flow specifications, and interfaces.

Form the foundation for everything else in your system model

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3
Q

T/F: BDD’s should be created often

A

T, BDDs are not tied to any particular stage of the system life cycle or level of design.

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4
Q

What is: the diagram kind abbreviation for a block definition diagram

A

bdd

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5
Q

What is: Namespace

A

Is simply a model element that’s allowed to contain other model elements; that is, it can have other elements nested under it within the model hierarchy.

Is a concept that have meaning only within your system model; it has no meaning within an instance of your system

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6
Q

What is: the most common kind of namespace that appear on BDDs

A

A Package

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7
Q

What is: Block

A

The basic unit of structure in SysML

Can be used to model any type of entity within your system of interest or in the system’s external environment

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8
Q

What are: The two varieties of Features

A

Structural Features (aka Properties)
Behavioral Features

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9
Q

What are: The five kinds of Structural Features (aka Properties)

A

Five Kinds:
Part Properties
Reference Properties
Value Properties
Constraint Properties
Ports

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10
Q

What is: Part Property

A

A Feature that represents a structure that’s internal to a block.

Stated differently, a block is composed of these. This relationship conveys ownership.

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11
Q

What is: the format of the string for a part property

A

‘part name’ is Modeler defined
‘type’ generally is the name of a block that you’ve created somewhere in the system model

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12
Q

What is: Multiplicity

A

A constraint on the number of instances that feature can represent within the composite, expressed as either a single integer or as a range of integers

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13
Q

What is: Multiplicity with no constraints

A

0..* OR *

  • = no upper bound

would read as ‘zero or more’

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14
Q

What is: Reference Property

A

Feature that represents a structure that’s external to a block

Does not convey ownership

Can roughly be described as a ‘needs’ relationship, a block with this feature needs that external structure for some purpose, either to provide a service or to exchange matter, energy, or data. This implies that some type of connection must exist between them.

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15
Q

What is: the format of the string for a reference property

A

‘reference name’ is modeler defined
‘type’ must be the name of a block or actor that you’ve created somewhere in the system model

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16
Q

What is: the reference property name contained in the Electrical Power Subsystem block

A

cdhs

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17
Q

What is: Value Property

A

A feature that can represent a quantity (of some type), a Boolean, or a string.

Most often, though, this feature is something you can assign a number to.

This feature is particularly useful in conjunction with constraint properties to construct a mathematical model of your system

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18
Q

What is: the format of the string for a value property

A

‘value name’ is modeler defined
‘type’ must be the name of a value type that you’ve created somewhere in the system model
‘default value’ is an optional piece of information; it represents the value assigned to the value property when an instance of its owning block first gets created

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19
Q

How: to convey that a value property is derived

A

put a forward slash (/) in front of its name.

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20
Q

What is: Constraint Property

A

A Feature that generally represents a mathematical relationship (an equation or inequality) that is imposed on a set of value properties.

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21
Q

What is: the format of the string for a constraint property

A

‘constraint name’ is modeler defined
‘type’ must be the name of a constraint block that you’ve created somewhere in the system model

Note that you’re not required to use constraint blocks to impose mathematical relationships on value properties. It’s perfectly legal to specify a constraint expression directly in the constraints compartment of a block.

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22
Q

What is: Constraint Block

A

This is simply a special kind of block—one that you create to encapsulate a reusable constraint expression.

Most often, a constraint expression is an equation or an inequality.

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23
Q

What is: Port

A

A feature that represents a distinct interaction point at the boundary of a structure through which external entities can interact with that structure—either to provide or request a service or to exchange matter, energy, or data.

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24
Q

T/F: A port decouples a block’s clients from any particular internal implementation

A

T, When you add a port to a block, you’re modeling a structure as a black box with respect to its environment; the structure’s internal implementation is hidden from its clients. Those clients know only the structure’s interface (the services it provides and requires, and the types of matter, energy, or data that can flow in and out).

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25
What are: the two kinds of ports
Standard Ports Flow Ports
26
What is: Standard Port
A port that lets you specify an interaction point with a focus on the services that a block provides or requires. Models the services (behaviors) that a block provides or requires at an interaction point on its boundary. Most often, you display this port as a small square straddling the border of a block.
27
What is: Flow Port
A port that lets you specify an interaction point with a focus on the types of matter, energy, or data that can flow in and out of a block. Most often, you display this port as a small square straddling the border of a block. This port has a symbol shown inside the small square.
28
What is: Interface
Like a block, it is an element of definition—one that defines a set of operations and receptions, a behavioral contract that clients and providers will conform to. You can display an interface on a BDD as a rectangle with the keyword «interface» preceding the name; you can display its operations and receptions in the second and third compartments. Figure 3.10 displays the Power Generation and Status Reporting interfaces using this notation.
29
How: is a provided interface displayed
Is displayed using the ball notation, similar to a lollipop symbol
30
How: is a required interface displayed
Is displayed using the socket symbol
31
What is: the two types of flow ports
Nonatomic Flow Port Atomic Flow Port
32
How: is a nonatomic port displayed
33
What is: Nonataomic Port
You add this flow port to a block when you need to model multiple types of items that could flow in or out via that port. The type of this flow port must be the name of a flow specification that you've created somewhere in the system model
34
What is: Flow Specification
Like a block, this is an element of definition -one that defines a set of flow properties that can flow in or out of a nonatomic flow port
35
What is: the format of the string for a flow property
The 'direction' can be in, out, or inout The 'name' is modeler defined The 'type' must be the name of a valuetype, block, or signal that you've created somewhere in your model hierarchy
36
What is: Atomic Flow Port
You add this flow port to a block when you need to model a single type of item that could flow in or out via that port. The type of this flow port must be the name of a value type, block, or signal that you've created somewhere in your model hierarchy
37
How: is an atomic port displayed
The symbol inside the small square is an arrow that conveys the direction of flow
38
What are: the two types of Behavioral Features
Operations Receptions
39
What is: Operation
This feature represents a behavior that a block performs when a client calls it. Stated formally it is invoked by a call event. Represents a synchronous behavior. This means the caller waits for the behavior to complete before continuing with its own execution. However SysML doesn't require this; you're free to represent any behavior as an operation - even when the caller doesn't wait for it to complete.
40
What is: the format of the string for an operation
The 'operation name' is modeler defined the 'parameter list' is a comma-separated list of zero or more parameters the 'return type' (if any) must be the name of a value type or block that you've created somewhere in your system model. The 'multiplicity' is a constraint on the number of instance of the return type that the operation can return to the caller when it completes
40
What is: the format of the string for an operation
The 'operation name' is modeler defined the 'parameter list' is a comma-separated list of zero or more parameters the 'return type' (if any) must be the name of a value type or block that you've created somewhere in your system model. The 'multiplicity' is a constraint on the number of instance of the return type that the operation can return to the caller when it completes
41
What is: the format of the string for a parameter list
The 'direction' can be in, out, or inout the 'parameter name' is modeler defined The 'type' must be the name of a value type or block that exists somewhere in your model The 'multiplicity' is a constraint on the number of instances of the type that the parameter can represent. The 'default value' is the value assigned to the parameter if no value is specified as an argument when the operation is called.
42
How many commands can a client pass when they call to perform 'processCommand' and what will it return once complete
one or more commands can be passed once complete it will return a status value to the caller
43
What is: Reception
This feature represents a behavior that a block performs when a client sends a signal that triggers it. Stated formally, this feature is invoked by a signal event This feature always represents an asynchronous behavior It does not wait for the feature to complete (or even, necessarily, to begin) Receptions cannot have return types
44
T/F: A signal is not a model element
False, a signal is itself a model element. You can use a signal to represent any type of matter, energy, or data that one part of a system sends to another part—generally for the purpose of triggering a behavior on the receiving end.
45
What is: the format of the string for a reception
The keyword 'signal' must always precede the 'reception name' The 'reception name' must match the name of the signal in your model that triggers it. You an display as many parameters as necessary in the parameter list
46
What are: the three main kinds of relationships that can exist between blocks
Associations Generalizations Dependencies
47
What is: Reference Association
This association between two blocks means that a connection can exist between instances of those blocks in an operational system. And those instances can access each other for some purpose across the connection.
48
How: is a Reference Association displayed
The notation is a solid line between two blocks the name floating near the middle of the line is the 'association name' you can optionally display a role name and multiplicity on either end of the line. The role name corresponds o the name of a reference property - one that belongs to the block at the opposite end and whose type is the block that it's next to
49
What is: Composite Association
This association between two blocks conveys structural decomposition. An instance of the block at the composite end is made up of some number of instances of the block at the part end
50
How: is a Composite Association displayed
A solid line between two blocks with a solid diamond on the composite end. An open arrowhead on the part end of the line conveys unidirectional access from the composite to its part; the absence of an arrowhead conveys bidirectional access The multiplicity on the part end of a composite association is not restricted; a composite structure can be made up of an arbitrary number of instances of parts-however many a system requires However the multiplicity on the composite end is restricted. A part- by definition- can belong only to one composite at a time The default multiplicity on the composite end of is 0..1. On the part end the default multiplicity is the usual case, 1.
51
What is: the DellSat-77 Satellite block composed of
One Electrical Power Subsystem One Attitude and Orbit Control Subsystem One Environmental Control Subsystem One Communication and Data Handling Subsystem
52
What is: Generalization
This is another kind of relationship you typically display on BDDs. It conveys inheritance between two elements, a subtype inherits all the features of it's supertype. In addition a subtype may have other features that its supertype doesn't have. Used to created classification trees (type hierarchies) in your system model and to define abstractions in your system design which means a subtype will be accepted wherever its supertype is required.
53
What is: Dependency
A kind of relationship you can display on BDDS. One element in the model, the client, depends on another element in the model, the supplier. More precisely, it conveys that when the supplier element changes, the client element may also have to change Most often, you create this relationship between two model elements solely to establish traceability between them.
54
How: is a Dependency displayed
The notations is a dashed line with an open arrowhead, which is drawn from the client to the supplier
55
Who is the supplier
the Data Handling interface
56
What is: Actor
Represents someone or something that has an external interface with your system The name of an actor conveys a role played by a person, an organization, or another system when it interacts with your system
57
The key ideas about generalizations and reference/composite associations also apply to when actors are involved in these relationships with what two constraints?
You cannot define a generalization between an actor and a block An actor cannot have parts; that is, it cannot appear at the composite end of a composite association. (We always regard an actor as a "black box. ")
58
What is: Value Type
Like a block, it is an element of definition - one that generally defines a type of quantity
59
What are: the three types on value types
Primitive Structured Enumerated
60
What is: Primitive Value Type
This value type has no internal structure (it doesn't own any value types).
61
How: is a Primitive Value Type displayed
A rectangle with the stereotype 'valueType' preceding the name
62
What is: Structured Value Type
This value type has an internal structure - generally two or more value properties
63
How: is a Structure Value Type displayed
A rectangle with the stereotype 'valueType' preceding the name
64
What is: Enumerated Value Type
This value type defines a set of literals (legal values) If a parameter of an operation (or some other kind of elements) is typed by an enumeration, then the value it holds at any moment must be on of the literals in the enumeration
65
How: is a Enumerated Value Type displayed
66
What is: Constraint Block
Like a block, it is an element of definition - one that defines a Boolean constraint expression (an expression that must evaluated to either true or false)
67
What is: Constraint Parameters
The variables in a constraint expression

OCSMP (5 decks)

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