1.1 Overview
The fieldbus Application Layer (FAL) provides user programs with a means to access the
Fieldbus communication environment. In this respect, the FAL can be viewed as a “window
between corresponding application programs.”
This part of IEC 61158 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 11 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.
1.2 Specifications
The principal objective of this part of IEC 61158 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 timecritical
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 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.
1.3 Conformance
This part of IEC 61158 do not specify individual implementations or products, nor do they
constrain the implementations of application layer entities within industrial automation
systems.
There is no conformance of equipment to this application layer service definition standard.
Instead, conformance is achieved through implementation of conforming application layer
protocols that fulfil any given Type of application layer services as defined in this part of IEC 61158.
IEC 61158-5-11:2007 Referenced Document
IEC 60559 Binary floating-point arithmetic for microprocessor systems
IEC 61131-1 Programmable controllers - Part 1: General information
ISO/IEC 10646-1 Information technology — Universal Multiple-Octet Coded Character Set (UCS) — Part 1: Architecture and Basic Multilingual Plane — Amendment 2: Limbu, Tai Le, Yijing and other characters
ISO/IEC 10731 Information technology - Open Systems Interconnection - Basic Reference Model - Conventions for the definition of OSI services
ISO/IEC 646 Information technology; ISO 7-bit coded character set for information interchange
ISO/IEC 7498-1 Information technology — Open Systems Interconnection — Basic Reference Model: The Basic Model
ISO/IEC 7498-3 Information technology - Open Systems Interconnection - Basic reference model: Naming and addressing
ISO/IEC 8822 Amendment 2 - Information technology -- Open Systems Interconnection -- Presentation service definition - Nested connections functional unit
ISO/IEC 8824 Information technology; open systems interconnection; specification of abstract syntax notation one (ASN.1)
ISO/IEC 8859-1 Information technology - 8-bit single-byte coded graphic character sets - Part 1: Latin alphabet No. 1
ISO/IEC 9545 Information technology - Open Systems Interconnection - Application layer structure
IEC 61158-5-11:2007 history
2007IEC 61158-5-11:2007 Industrial communication networks - Fieldbus specifications - Part 5-11: Application layer service definition - Type 11 elements