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Date created: 5/10/2003
Last updated: 4/15/2008

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A Few PSL Basics...

For many years, the Manufacturing Systems Integration Division (MSID) has been involved in the definition of a neutral representation of product data, most recently realized through the STEP standard. With that effort well underway, another candidate area for a division focus is the representation of manufacturing process. Like product data, process data is also used throughout the life cycle of a product, from early indications of manufacturing process flagged during design, through process planning, validation, production scheduling and control. In addition, the notion of process also underlies the entire manufacturing cycle, coordinating the workflow within engineering and shop floor manufacturing.

The Process Specification Language (PSL) defines a neutral representation for manufacturing processes that supports automated reasoning. Process data is used throughout the life cycle of a product, from early indications of manufacturing process flagged during design, through process planning, validation, production scheduling and control. In addition, the notion of process also underlies the entire manufacturing cycle, coordinating the workflow within engineering and shop floor manufacturing.

If you would like to learn more about PSL, including rationale and the need for its implementation, please continue.


Read more on the PSL Standard:
PSL is published International Standard 18629 of the International Standards Organization (ISO), from within the Joint Working Group 8 of Sub-committee 4 (Industrial data) and Sub-committee 5 (Manufacturing integration) of Technical committee ISO TC 184 (Industrial automation systems and integration). For more information see the published specifications.


Technical inquiries: PSL Team
Website comments: Webmaster

Manufacturing Systems Integration Division
NIST, 100 Bureau Drive, Stop 8260, Gaithersburg, MD 20899-8260.

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APR 2008
Updated version of PSL available. See ontology and download pages.

JAN 2008
Updated version of PSL available. See ontology and download pages.

SEPT 2007
Updated version of PSL available. See ontology and download pages.

FEB 2007
NIST completes major update to PSL Web site, with a new version available for download and use with automated reasoners. More in NIST Tech Beat article.

AUG 2006
ISO completes PSL as published International Standard 18629. More in ISO Specs.

DEC 2005
An international standards team is improving manufacturing processes by helping computers better understand process commands. More in IEEE Intelligent Systems article.

SEPT 2005
W3C accepts Semantic Web Services Framework based on PSL, enabling more flexible automation of service provision and use.
More in SWSF Overview.


JUNE 2005
Software language uses artificial intelligence and language analysis to help computers reason more precisely than they do now. More in Information Week's article, "Computers Get the Meaning."


JUNE 2005
The process specification language should make computers much more useful in manufacturing, federal researchers say. Further details in Information Week's article, "New Software Language Helps Computers Better Understand Nuanced Commands."

NOV 2004
Industrial automation systems and integration -- Process specification language -- Part 1: Overview and basic principles becomes an international standard.

MAY 2004
PSL 2.1 available.
What's New in PSL 2.1

JAN 2004
Draft International Standard Ballot for ISO/DIS 18629-1 (PSL: Principles and Overview) was approved.