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Application module:
Signal |
ISO/TS 10303-1745:2006(E)
© ISO
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This clause specifies the information requirements for the
Signal
application module. The information requirements are specified as the
Application Reference Model (ARM) of this application module.
NOTE 1 A graphical representation of the information
requirements is given in
Annex C.
NOTE 2 The mapping specification is specified in
5.1. It shows how
the information requirements are met by using common resources and
constructs defined or imported in the MIM schema of this application
module.
The following EXPRESS specification begins the
Signal_arm
schema and identifies the necessary external references.
EXPRESS specification:
*)
SCHEMA Signal_arm;
(*
The following EXPRESS interface statement specifies the elements
imported from the ARM of another application module.
EXPRESS specification:
*)
USE FROM
Characteristic_arm;
--
ISO/TS 10303-1654
(*
NOTE 1
The schemas referenced above are specified in the following
part of ISO 10303:
| Characteristic_arm |
ISO/TS 10303-1654 |
NOTE 2
See Annex C,
Figures
C.1and C.2
for a graphical representation of this schema.
This subclause specifies the ARM type
for this application module. The ARM type and
definition is specified below.
The s_external_identification_item type is an extension
of the
external_identification_item type.
It adds the data
types
Composite_signal_property_relationship, Signal_property
and
Signal
to the list of alternate data types.
NOTE The list of entity data types may be
extended in application modules that use the constructs of
this module.
EXPRESS specification:
*)
TYPE
s_external_identification_item =
EXTENSIBLE
GENERIC_ENTITY
SELECT
BASED_ON
external_identification_item
WITH
(Composite_signal_property_relationship,
Signal_property,
Signal);
END_TYPE;
(*
This subclause specifies the ARM entities for this
module. Each ARM application entity is an atomic element that
embodies a unique application concept and contains attributes
specifying the data elements of the entity. The ARM
entities and definitions are specified below.
A Composite_signal_property is a type of Signal_property
that combines more than one signal property into its structure. This part of ISO 10303 does not predefine the domain semantics
of the structural relationship.
EXPRESS specification:
*)
ENTITY Composite_signal_property
SUBTYPE OF (Signal_property);
INVERSE
signal_property_structure : SET[1:?] OF Composite_signal_property_relationship FOR composition;
END_ENTITY;
(*
Attribute definitions:
signal_property_structure:
an inverse relationship that specifies that the existence of the Composite_signal_property is
dependent on
the existence of the Composite_signal_property_relationship that specifies the Composite_signal_property as its
composition. There shall be one or more Composite_signal_property_relationship for a
Composite_signal_property.
A Composite_signal_property_relationship is the aggregation of
the Signal_property that compose the Composite_signal_property.
EXPRESS specification:
*)
ENTITY Composite_signal_property_relationship;
composition : Composite_signal_property;
signal_property_structural_element : Signal_property;
INVERSE
aggregation_operation : External_source_identification FOR item;
END_ENTITY;
(*
Attribute definitions:
composition:
specifies a role of the Composite_signal_property for the Composite_signal_property_relationship. The structure
shall be defined by an ISO or IEC standard.
signal_property_structural_element:
specifies the Signal_property that is being included in the Composite_signal_property_relationship.
aggregation_operation:
specifies an inverse relationship that specifies that the existence of the Composite_signal_property_relationship
is dependent on the existence of the
External_source_identification
that specifies the Composite_signal_property_relationship
as its
item.
An aggregation_operation specifies the
External_source_identification
for the mathematical model for the inclusion of an element in the
Composite_signal_property_relationship. The structure that the aggregation_operation helps to implement
shall be specified by an ISO or an IEC standard.
A Signal is an abstraction of signal as categorized according to an ISO or IEC standard in this part of ISO 10303.
Signal in this part of ISO 10303 is specifically included for the purpose of exchanging information related to functional abstractions
of products as commonly specified on data sheets.
There is no predefined mechanism in this part of ISO 10303 that defines standard physical arrangement of instrumentation
and test articles to support test processes.
This part of ISO 10303 provides a standard mechanism to associate sets of data that characterize the behaviour of a product
with the functional hierarchical model and physical geometric model of that product.
NOTE 1
A Signal is a physical phenomenon that may be characterized by means of appropriate instrumentation or simulated by a computer system
for the purpose of evaluating system behaviour.
NOTE 2
IEC Multi-Lingual Dictionary Volume 2, 1992: signal (174) a physical phenomenon, one or more of whose characteristics may
vary to represent information.
EXAMPLE
The physical phenomenon may be, for instance, an electromagnetic wave, or acoustic wave and the
characteristic may be an electric field, a voltage, or a sound pressure.
EXPRESS specification:
*)
ENTITY Signal;
name : STRING;
INVERSE
signal_category : External_source_identification FOR item;
UNIQUE
UR1: name;
END_ENTITY;
(*
Attribute definitions:
name:
the words by which the Signal is known.
signal_category:
specifies an inverse relationship that specifies that the existence of the Signal
is dependent on the existence of the
External_source_identification
that specifies the Signal
as its
item.
Formal propositions:
UR1:
The name shall be unique within a population of Signals.
A Signal_property is a data set that characterizes a Signal and each element of which has units that are traceable to an ISO or
IEC standard. The units may be basic Si units, derived SI units, conversion based units, or context
dependent units. Conversion based and context dependent units shall be specified in the external standard
that defines the signal_property_category.
A Signal_property may be a
Composite_signal_property
NOTE
A context dependent unit may be the identification of an enumerated list of values, as in digital simulation or data transfer.
EXPRESS specification:
*)
ENTITY Signal_property
SUPERTYPE OF (Composite_signal_property);
signal_property_representation : Characteristic_data_table;
characterized_signal : Signal;
INVERSE
signal_property_category : External_source_identification FOR item;
END_ENTITY;
(*
Attribute definitions:
signal_property_representation:
specifies the Characteristic_data_table of the Signal_property. The signal_property_representation is at least a two dimensional representation, including a sample function and a data set represented at the discrete points
of the sample function.
NOTE
A signal_property_representation is a discretized function represented by a table that maps a parameter, such as time, frequency, or distance, onto a response
variable. The table is represented in this standard by a list of columnar data, each column is represented by set. One member
of the set is a representation of the sample function at that sample point. The other members of the set represents the discretized
parameters (e.g,. power).
EXAMPLE
An example signal_property_representation characterizes voltage over a defined frequency range.
characterized_signal:
specifies the Signal that has the
Signal_property.
signal_property_category:
specifies an inverse relationship that specifies that the existence of the Signal_property
is dependent on the existence of the
External_source_identification
that specifies the Signal_property
as its
item.
*)
END_SCHEMA; -- Signal_arm
(*
© ISO 2006 — All rights reserved
