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By Saad, practising automation engineer · Updated 2026-09-25

The unique identifier of an instrument, e.g. PT-1001 for pressure transmitter 1001.

SchematicForge uses this term in generated loop diagrams, the Loop Register, and termination lists.

Related terms

• Analog input (AI)
• Analog output (AO)
• Digital input (DI)
• Digital output (DO)
• JB
• Loop