DIN EN 61158-5-16-2008 工業通信網絡.現場總線規范.第5-16部分:應用層服務定義.16型元件
Industrial communication networks - Fieldbus specifications - Part 5-16: Application layer service definition - Type 16 elements (IEC 61158-5-16:2007); English version EN 61158-5-16:2008, only on CD-ROM
DIN EN 61158-5-2005DIN EN 61158-500-2006DIN EN 61491-1999
適用范圍
This standard provides common elements for basic time-critical and non-time-critical messaging
communications between application programs in an automation environment and material specific
to Type 16 fieldbus. The term “time-critical” is used to represent the presence of a time-window,
within which one or more specified actions are required to be completed with some defined level of
certainty. Failure to complete specified actions within the time window risks failure of the
applications requesting the actions, with attendant risk to equipment, plant and possibly human life.
This standard defines in an abstract way the externally visible service provided by the fieldbus
application layer in terms of
a) an abstract model for defining application resources (objects) capable of being manipulated by
users via the use of the FAL service,
b) the primitive actions and events of the service;
c) the parameters associated with each primitive action and event, and the form which they take;
and
d) the interrelationship between these actions and events, and their valid sequences.
The purpose of this standard is to define the services provided to
1) the FAL user at the boundary between the user and the application layer of the fieldbus
reference model, and
2) Systems Management at the boundary between the application layer and Systems Management
of the fieldbus reference model.
This standard specifies the structure and services of the fieldbus application layer, in conformance
with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI application layer structure
(ISO/IEC 9545).
The principal objective of this standard is to specify the characteristics of conceptual application
layer services suitable for time-critical communications, and thus supplement the OSI Basic
Reference Model in guiding the development of application layer protocols for time-critical
communications.
A secondary objective is to provide migration paths from previously-existing industrial
communications protocols. It is this latter objective which gives rise to the diversity of services
standardized as the various Types of IEC 61158, and the corresponding protocols standardized in
subparts of IEC 61158-6.
This specification may be used as the basis for formal application programming interfaces.
Nevertheless, it is not a formal programming interface, and any such interface will need to address
implementation issues not covered by this specification, including
a) the sizes and octet ordering of various multi-octet service parameters, and
b) the correlation of paired request and confirm, or indication and response, primitives.