ISA 50.02-6 : 1998

Foreword
Introduction
1 Scope
2 Normative References
3 Definitions
  3.1 Definitions from other ISO/IEC Standards
  3.2 Definitions from ISA-S50.02-5
  3.3 Other Definitions
  3.4 Abbreviations and Symbols
  3.5 Conventions
  3.6 Conventions Used in State Machines
4 FAL Syntax Description
  4.1 FAL-AR PDU Abstract Syntax 1
  4.2 FAL-AR PDU Abstract Syntax 2
  4.3 Abstract Syntax of PDU Body
  4.4 Data Types
5 FAL Protocol State Machine
  5.1 AP Context State Machine
  5.2 FAL Service Protocol Machine (FSPM)
  5.3 DLL Mapping Protocol Machine (DMPM)
Annex A (normative) FAL Header
Annex B (normative) Reason Codes
Annex C (normative) Data Link Layer Service Selection
Annex D (normative) Compact Encoding Rule (CER)
Annex E (normative) Traditional Encoding Rule (TER)
Annex F (normative) Buffer-Oriented Encoding Rules (BER) and
                    Messaging Encoding Rule (MER)
Annex G (normative) Queue Usertriggered Unidirectional (QUU)
                    ARPM
Annex H (normative) Queued Usertriggered Bidirectional-Connection
                    Oriented (QUB-CO) ARPM
Annex I (normative) Queued Usertriggered Bidirectional-Connectionless
                    (QUB-CI) ARPM
Annex J (Normative) Queued Usertriggered Bidirectional-Segmentation
                    (QUB-Seg) ARPM
Annex K (normative) Queued Usertriggered Bidirectional-Flow Control
                    (QUB-FC) ARPM
Annex L (normative) Buffered Usertriggered Bidirectional
                    (BUB) ARPM
Annex M (normative) Buffered Networkscheduled Bidirectional
                    (BNB) ARPM
Annex N (normative) Buffered Networkscheduled Unidirectional
                    (BNU) ARPM
Annex O (normative) Buffered Networkscheduled Unidirectional-MP
                    (BNU-MP) ARPM
Annex P (informative) Protocol Option 1
Annex Q (informative) Protocol Option 2
Annex R (informative) Protocol Option 3

Designed to support the conveyance of time critical application requests and responses amongst devices in automation environments. The "time-critical" term represents presence of a time-window, within which one or more defined actions should be completed with some specified level of certainty. Failure in completing defined actions within the time window risks failure of applications requesting the actions, with risk to plant, equipment and even human life. Defines interactions between remote applications in terms of encoding rules applied to all APDUs, formal Abstract Syntax definitions of these APDUs, protocol state machine descriptions which handle APDUs and primitives in correct sequences, and mappings of APDUs to and from Data Link services specified in ISA-S50.02-3.