ISO 18629-42:2006

Overview

ISO 18629-42:2006 - part of the Process Specification Language (PSL) family - is a definitional extension that adds temporal and state extensions to the PSL vocabulary. The standard provides definitions, lexicons and grammars in the language of ISO 18629 for concepts related to activity extensions. Its purpose is to structure the semantic concepts used to capture and exchange process information in discrete manufacturing and other industrial automation contexts.

Key SEO keywords: ISO 18629-42, Process Specification Language, PSL, industrial automation, temporal extensions, state extensions, discrete manufacturing, process information exchange.

Key topics and technical requirements

ISO 18629-42:2006 focuses on formalizing how time and state aspects of activities are expressed in PSL. Major technical topics include:

• State-based preconditions and effects
  • Primitive and defined lexicons (e.g., state_equiv, markov_precond, partial_state, rigid_state)
  • Core theories and definitional extensions supporting state semantics
  • Grammar for expressing state-based relations
• Time-based preconditions and effects
  • Lexicons and definitions (e.g., begin_equiv, time_precond, rigid_time)
  • Theories and grammar for temporal constraints
• Combined state-and-time preconditions
  • Mixed preconditions (mixed_precond, partial_mixed, rigid_mixed)
• Occurrence-based and periodic aspects
  • Occurrence preconditions/effects (tree_equiv, occurrence_constrained, occurrence_dependent)
  • Periodic, intermittent and aperiodic preconditions
• Preventable and spoilage conditions
  • Definitions for preventable, possibly_preventable, spoilage, nonspoilage
• Effects semantics and constraints
  • Temporal, state, occurrence constraints and occurrence quantum/classical categories
• Lexicon, grammar and formal definitional extensions
  • Each topic supplies primitive lexicon, defined lexicon, required theories, definitional extensions and grammar fragments

The standard does not prescribe implementations; it supplies semantic definitions and grammars to enable consistent representation and exchange.

Practical applications

ISO 18629-42 is used to:

• Model and exchange precise process semantics for scheduling, simulation and verification in discrete manufacturing
• Enable interoperability between MES, PLM, ERP and automation control systems by providing a common PSL vocabulary for temporal and state behavior
• Support process analytics, quality tracking, spoilage modeling and preventability analysis
• Improve machine-to-machine and enterprise system communication where activity timing and state transitions are critical

Who should use it

• Systems integrators and automation engineers
• MES/ERP/PLM software vendors and architects
• Process modelers, simulation and scheduling tool developers
• Researchers and standards developers working on industrial interoperability and process semantics

Related standards

• ISO 18629 Process Specification Language (PSL) series - Parts 41–49 provide related definitional extensions and overviews within the same PSL framework.