1.1 General

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 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 12 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 behavior provided by the different Types of the fieldbus Application Layer in terms of

the abstract syntax defining the application layer protocol data units conveyed between communicating application entities,
the transfer syntax defining the application layer protocol data units conveyed between communicating application entities,
the application context state machine defining the application service behavior visible between communicating application entities; and
the application relationship state machines defining the communication behavior visible between communicating application entities; and.

The purpose of this standard is to define the protocol provided to

define the wire-representation of the service primitives defined in IEC 61158-5-12, and
define the externally visible behavior associated with their transfer.

This standard specifies the protocol of the IEC fieldbus Application Layer, in conformance with the OSI Basic Reference Model (ISO/IEC 7498) and the OSI Application Layer Structure (ISO/IEC 9545).

FAL services and protocols are provided by FAL application-entities (AE) contained within the application processes. The FAL AE is composed of a set of object-oriented Application Service Elements (ASEs) and a Layer Management Entity (LME) that manages the AE. The ASEs provide communication services that operate on a set of related application process object (APO) classes. One of the FAL ASEs is a management ASE that provides a common set of services for the management of the instances of FAL classes.

Although these services specify, from the perspective of applications, how request and responses are issued and delivered, they do not include a specification of what the requesting and responding applications are to do with them. That is, the behavioral aspects of the applications are not specified; only a definition of what requests and responses they can send/receive is specified. This permits greater flexibility to the FAL users in standardizing such object behavior. In addition to these services, some supporting services are also defined in this standard to provide access to the FAL to control certain aspects of its operation.

1.2 Specifications

The principal objective of this standard is to specify the syntax and behavior of the application layer protocol that conveys the application layer services defined in IEC 61158-5-12.

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 protocols standardized in subparts of IEC 61158-6.

1.3 Conformance

This standard does not specify individual implementations or products, nor does it constrain the implementations of application layer entities within industrial automation systems.

There is no conformance of equipment to the application layer service definition standard. Instead, conformance is achieved through implementation of this application layer protocol specification.

PDF Catalog

PDF Pages	PDF Title
6	CONTENTS
11	INTRODUCTION
12	1 Scope 1.1 General
13	1.2 Specifications 1.3 Conformance 2 Normative references
14	3 Terms, definitions, symbols, abbreviations and conventions 3.1 Reference model terms and definitions 3.2 Service convention terms and definitions
15	3.3 Application layer definitions
20	3.4 Common symbols and abbreviations 3.5 Additional symbols and abbreviations
22	3.6 Conventions Figures Figure 1 – Common structure of specific fields
24	Figure 2 – Type description example Tables Table 1 – PDU element description example
25	Table 2 – Example attribute description Table 3 – State machine description elements
26	Table 4 – Description of state machine elements Table 5 – Conventions used in state machines
27	4 Application layer protocol specification 4.1 Operating principle 4.2 Node reference model
28	Figure 3 – Slave Node Reference Model
29	5 FAL syntax description 5.1 Coding principles 5.2 Data types and encoding rules Figure 4 – Encoding of Time Of Day value
30	Figure 5 – Encoding of Time Difference value Table 6 – Transfer Syntax for bit sequences
31	Table 7 – Transfer syntax for data type Unsignedn
32	5.3 AR coding Figure 6 – AL Control Request structure Table 8 – Transfer syntax for data type Integern
33	Figure 7 – AL Control Response structure Table 9 – AL Control Description Table 10 – AL Control Response
34	Table 11 – AL Status Codes
35	Figure 8 – AL State Changed structure Table 12 – AL State Changed
36	Figure 9 – PDI Control type description Figure 10 – Sync Configuration type description Table 13 – PDI Control Table 14 – PDI Configuration
37	5.4 SII coding Table 15 – Sync Configuration Table 16 – Slave Information Interface Area
38	Table 17 – Slave Information Interface Categories Table 18 – Mailbox Protocols Supported Types
39	Table 19 – Categories Types Table 20 – Structure Category String
40	Table 21 – Structure Category General
41	Table 22 – Structure Category FMMU Table 23 – Structure Category SyncM for each Element
42	5.5 Isochronous PDI coding Table 24 – Structure Category TXPDO and RXPDO for each PDO Table 25 – Structure PDO Entry
43	Figure 11 – Distributed Clock sync and latch type description
44	Table 26 – Distributed Clock sync parameter
45	Table 27 – Distributed Clock latch data
46	5.6 CoE coding Figure 12 – CoE general structure Table 28 – CoE elements
47	Figure 13 – SDO Download Expedited Request structure
48	Figure 14 – SDO Download Expedited Response structure Table 29 – SDO Download Expedited Request
49	Figure 15 – SDO Download Normal Request structure Table 30 – SDO Download Expedited Response
50	Table 31 – SDO Download Normal Request
51	Figure 16 – Download SDO Segment Request structure Table 32 – Download SDO Segment Request
52	Figure 17 – Download SDO Segment Response structure Figure 18 – SDO Upload Expedited Request structure Table 33 – Download SDO Segment Response
53	Figure 19 – SDO Upload Expedited Response structure Table 34 – SDO Upload Expedited Request
54	Table 35 – SDO Upload Expedited Response
55	Figure 20 – SDO Upload Normal Response structure Table 36 – SDO Upload Normal Response
56	Figure 21 – Upload SDO Segment Request structure Figure 22 – Upload SDO Segment Response structure Table 37 – Upload SDO Segment Request
57	Figure 23 – Abort SDO Transfer Request structure Table 38 – Upload SDO Segment Response
58	Table 39 – Abort SDO Transfer Request
59	Table 40 – SDO Abort Codes
60	Figure 24 – SDO Information Service structure Figure 25 – Get OD List Request structure Table 41 – SDO Information Service
61	Figure 26 – Get OD List Response structure Table 42 – Get OD List Request
62	Table 43 – Get OD List Response
63	Figure 27 – Get Object Description Request structure Figure 28 – Get Object Description Response structure Table 44 – Get Object Description Request
64	Figure 29 – Get Entry Description Request structure Table 45 – Get Object Description Response
65	Figure 30 – Get Entry Description Response structure Table 46 – Get Entry Description Request
66	Table 47 – Get Entry Description Response
67	Figure 31 – SDO Info Error Request structure
68	Table 48 – SDO Info Error Request
69	Table 49 – Emergency Request
70	Table 50 – Emergency Error Codes Table 51 – Error Code
71	Table 52 – Diagnostic Data Table 53 – Sync Manager Length Error Table 54 – Sync Manager Address Error Table 55 – Sync Manager Settings Error
72	Table 56 – RxPDO Transmission via mailbox Table 57 – TxPDO Transmission via mailbox
73	Table 58 – RxPDO Remote Transmission Request Table 59 – TxPDO Remote Transmission Request
74	Table 60 – Command object structure Table 61 – Object Dictionary Structure Table 62 – Object Code Definitions
75	Table 63 – Basic Data Type Area
76	Table 64 – Extended Data Type Area
77	Table 65 – Enumeration Definition Table 66 – CoE Communication Area
78	Table 67 – Device Type
79	Table 68 – Error Register Table 69 – Manufacturer Device Name
80	Table 70 – Manufacturer Hardware Version Table 71 – Manufacturer Software Version Table 72 – Identity Object
81	Table 73 – Receive PDO Mapping Table 74 – Transmit PDO Mapping
82	Table 75 – Sync Manager Communication Type
83	Table 76 – Sync Manager Channel 0-31
84	5.7 EoE coding Figure 32 – EoE general structure Table 77 – Sync Manager Synchronization
85	Figure 33 – EoE Timestamp structure Table 78 – Initiate EoE Request
86	Figure 34 – EoE Fragment Request structure Table 79 – Initiate EoE Response
87	Table 80 – EoE Fragment Request
88	Figure 35 – Set IP Parameter Request structure Table 81 – EoE Data
89	Table 82 – Set IP Parameter Request
90	Figure 36 – Set IP Parameter Response structure Table 83 – Set IP Parameter Response
91	Figure 37 – Set Address Filter Request structure Table 84 – EoE Result Parameter
92	Table 85 – Set Address Filter Request
93	5.8 FoE Coding Figure 38 – Set Address Filter Response structure Table 86 – Set Address Filter Response
94	Figure 39 – Read Request structure Figure 40 – Write Request structure Table 87 – Read Request
95	Figure 41 – Data Request structure Table 88 – Write Request
96	Figure 42 – Ack Request structure Table 89 – Data Request
97	Figure 43 – Error Request structure Table 90 – Ack Request
98	Table 91 – Error Request Table 92 – Error codes of FoE
99	6 FAL protocol state machines 6.1 Overall structure Figure 44 – Busy Request structure Table 93 – Busy Request
100	Figure 45 – Relationship among Protocol Machines
101	6.2 AP-Context state machine 6.3 FAL service protocol machine (FSPM) 6.4 Application Relationship Protocol Machines (ARPMs) Figure 46 – AR Protocol machines
103	Figure 47 – ESM Diagramm Table 94 – State transitions and local management services
104	Table 95 – Primitives issued by ESM to DL Table 96 – Primitives issued by DL to ESM
105	Table 97 – Primitives issued by Application to ESM Table 98 – Primitives issued by ESM to Application Table 99 – ESM Variables
106	Table 100 – ESM macros
107	Table 101 – ESM functions
108	Table 102 – ESM state table
120	Table 103 – ESM Functions Table 104 – Primitives issued by Mailbox handler to DL Table 105 – Primitives issued by DL to Mailbox handler
121	Table 106 – Primitives issued by Protocol handler to Mailbox handler Table 107 – Primitives issued by Mailbox handler to Protocol handler
122	Table 108 – Primitives issued by Application to CoESM
123	Table 109 – Primitives issued by CoESM to Application Table 110 – CoESM state table
133	Table 111 – Primitives issued by Application to EoESM
134	Table 112 – Primitives issued by EoESM to Application
135	Table 113 – EoESM state table
139	Table 114 – Primitives issued by Application to FoESM
140	Table 115 – Primitives issued by FoESM to Application Table 116 – FoESM state table
144	6.5 DLL mapping protocol machine (DMPM)
145	Bibliography

Published By	Publication Date	Number of Pages
BSI	2012	148


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Status	Withdrawn
Title	Industrial communication networks. Fieldbus specifications – Application layer protocol specification. Type 12 elements
Replaces	BS EN 61158-6-12:2008
Publisher	BSI
Committee	GEL/65/3
Pages	148
Publication Date	2012-07-31
Withdrawn Date	2014-11-30
Replaced By	BS EN 61158-6-12:2014
ISBN	978 0 580 71566 2
Standard Number	BS EN 61158-6-12:2012
Identical National Standard Of	IEC 61158-6-12:2010, EN 61158-6-12:2012
Descriptors	Interfaces (data processing), Industrial, Communication networks, Open systems interconnection, Application layer (OSI), Fieldbus, Communication procedures, Automatic control systems, Bus networks, Data transmission, Computer networks, Process control
ICS Codes	25.040.40 - Industrial process measurement and control

BS EN 61158-6-12:2012

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