ANSI/ISA-50.00.01:1975(R2012)

The ISA Standards & Practices Board has removed this document from active status, meaning it is no longer being reviewed or assessed for accuracy, for relevance to current practices, or for further applications. However, some users may find that the document still provides valid and useful content for their specific needs.This document applies to analog dc signals used in process control and monitoring systems to transmit information between subsystems or separated elements of systems.Its purpose is to provide for compatibility between the several subsystems or separated elements of given systems.This document need not apply to signals entirely used within a subsystem.When signals are to be transmitted to or received from subsystems or elements provided by different suppliers, they shall comply with the specified requirements for transmitters and receivers here.