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The instrument symbols used in these drawings are generally based on International Society of Automation (ISA) Standard S5.1; The primary schematic drawing used for laying out a process control installation. They usually contain the following information: Mechanical equipment, including:
Based on the standards ANSI/ISA S5.1 and ISO 14617-6, the identifications consist of up to 5 letters. The first identification letter is for the measured value, the second is a modifier, 3rd indicates the passive/readout function, 4th - active/output function, and the 5th is the function modifier.
Part 1: Specification of Diagrams (ISO 10628-1:2014) [1] Part 2: Graphical Symbols (ISO 10628-2:2012) This document supersedes ISO 10628:2000 and ISO 10628:1997.
Another significant ISA standard family is the batch processing standards of ANSI/ISA-88.00.01 Models and Terminology, ANSI/ISA-88.00.02 Data Structures and Guidelines for Languages, and ANSI/ISA-88.00.03 General and Site Recipe Models and Representation, which are products of the ISA-88 Batch Control committee.
ANSI/ISA-95, or ISA-95 as it is more commonly referred, is an international standard from the International Society of Automation for developing an automated interface between enterprise and control systems. This standard has been developed for global manufacturers.
It is a design philosophy for describing equipment and procedures. It is not a standard for software and is equally applicable to manual processes. It was approved by the ISA in 1995 and updated in 2010. Its original version was adopted by the IEC in 1997 as IEC 61512-1. The current parts of the S88 standard include: Models and terminology
The relationship between IEC and ISA in the development of the IEC 62443 series is characterized by complementary roles. IEC serves as the global standardization body responsible for publishing and maintaining the IEC 62443 series, while ISA contributes significant technical expertise, industry insight, and foundational drafts through its ISA99 committee.
ISA 84.01/IEC 61511 requires a management system for identified SIS. An SIS is composed of a separate and independent combination of sensors, logic solvers, final elements, and support systems that are designed and managed to achieve a specified safety integrity level (SIL).