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1. 4 Binary logic gates, input/output tables, or descriptive narratives shall not be shown. 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.

9 Classifications or Safety Integrity Levels (SIL) shall not be shown for interlocks. 10 All operator-initiated interlock trip and reset hand switches shall be shown. 11 If used, all bypass hand switches for SIS interlocks shall be shown, including all individual initiator and system bypass switches. Comment: Unnecessary clutter can be avoided by use of a table or reference note if large numbers of bypasses are necessary. 12 All hardwired alarms shall be shown. 13 All alarms that require engineering or other review and approval based on safety or operability shall be shown.

Analog and digital output points). , regulatory controllers and pump start/stop switches). , points that interface with controllers in the linked system and SIS reset hand switches). , selectors in override controls or enthalpy calculators in heat duty controls). , rolling averages for emissions monitoring or compressor runtimes). 10 DCS points that are necessary to understand the functional operation of process control schemes shall be shown. , points that provide bumpless transfer, initialization, some logic functions).

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