IEC 61346-1 is a pivotal international standard that established the fundamental rules for structuring technical information and forming reference designations for industrial systems. Originally published in 1996, it has since been superseded by the series. Core Purpose and Scope
=): What does it do? (e.g., =Cooling or =P-101). This is process-oriented.-): What is it? (e.g., -M01 for a motor). This is hardware/component oriented.+): Where is it? (e.g., +TankFarm or +Panel01). This is spatial.When a fault occurs, the PLC sees an error on --K01 . The maintenance manual is indexed by -Q01 . The ERP system ordered -Q01 as a spare part. But --K01 is inside -Q01 . iec 61346-1 pdf