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5 All logic function and interlock symbols shall contain an identification that provides reference to a unique logic diagram, narrative, truth table, or program. The reference shall be located within the interior of the symbol. The format of the reference shall be determined by the owner. Descriptive text or a note reference can be placed outside the symbol. 6 If Safety Instrumented Systems (SIS) are distinguished from other interlock systems, the preferred method shall be to add an “S” prefix to the unique interlock identification.

DCS, PLC, relays, redundant, fault-tolerant Safety Interlock Systems). Alarms can be similarly designed in a variety of ways. Alarms come from hardware, over serial links, from DCS software and can be shown on a variety of facility documents, including P&IDs, alarm summaries, logic and loop diagrams, and operating procedures. 01, many documentation aspects of interlock and alarm system design should be defined by the owner. 1. 4 Binary logic gates, input/output tables, or descriptive narratives shall not be shown.

Process Industry Practices Page 29 of 31 PIP PIC001 Piping and Instrumentation Diagram Documentation Criteria COMPLETE REVISION April 2008 Application of these requirements to specific systems shall determine which DCS points to show. DCS points not shown can be displayed on special purpose auxiliary drawings. , flows, temperatures, pressures, compositions from analyzers, and valve open/closed status). , a flow indicator point shall not be shown if the value is represented by a flow controller point on the P&ID).

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