ISA-95 levels, explained without the diagram worship
What levels 0–4 actually mean for MES integration, B2MML exchanges, and conversations between IT and operations.
MES integration
The ERP/MES interface discipline.
Shorthand for the interface layer between operations and business systems: tag-to-lot context mapping, B2MML or API exchanges, and master-data alignment between MES and ERP.
Use the concept: Downtime log template · SMED changeover observation template · Takt time calculator
In depth
Takt time vs cycle time vs lead time: calculate the right clock
A worked shift example separates customer pace, observed process speed and end-to-end delivery time, with practical checks before changing the line.
SMED changeover study: measure last good to first good
Use a time observation sheet to separate internal and external work, preserve safe setup steps, and verify a repeatable changeover improvement.