ISA-95
ISA-95: Enterprise-Control Integration
Integration between business and manufacturing systems
Purdue Model Hierarchy
Level 4: Business Planning & Logistics
Timescale: Days to months
Systems: ERP, BI
Level 3: Manufacturing Operations Management
Timescale: Shifts to days
Systems: MES, LIMS, WMS
Level 2: Supervisory Control
Timescale: Seconds to hours
Systems: SCADA, HMI, Batch
Level 1: Direct Control
Timescale: Milliseconds to seconds
Systems: PLC, DCS, RTU
Level 0: Physical Process
Timescale: Continuous
Systems: Sensors, Actuators
Equipment Hierarchy
Enterprise
└─ Site (1:N)
└─ Area (1:N)
└─ Work Center (1:N)
└─ Work Unit (1:N)
└─ Equipment (1:N)
Key UDTs
PhysicalAsset
id:UUID
path:PATH
name:str
level:L0-L4
parent:ref
children:[ref]
Equipment
extends PhysicalAsset
capability:[str]
state:EquipmentState
mode:EquipmentMode
Material
id:UUID
name:str
lot:str|null
sublots:[ref]
Data Flows
L4→L3:
Schedule, MaterialDef, ProductDef, WorkOrder
L3→L4:
Performance, Inventory, Quality, Status
L3→L2:
Recipe, Setpoints, Commands, Schedule
L2→L3:
ProcessData, Events, Alarms, Batch