UNS Concepts in Tier0

Data collected to Tier0 UNS is categorized into 3 types: Metric, State, and Action. Different types correspond to different storage methods.

Metric, State, Action

Topic type	Carries	Example
METRIC	Real-time data	Machine temperature/pressure/voltage
STATE	Status data	Machine operational status
ACTION	Commands or events	Start batch, stop machine

flowchart TD
  plant["Plant/"] --> line1["Line1/"]
  line1 --> metric["Metric/"]
  line1 --> state["State/"]
  line1 --> action["Action/"]
  metric --> temp(["Temperature"])
  state --> status(["MachineStatus"])
  action --> start(["StartBatch"])
  class temp,status,start t0accent

How the UNS stores data

Data Type	Storage	Description
Metric	Time-series database	Optimized for high-frequency measurements such as temperature and pressure. Each topic includes default fields: timestamp and quality.
State	PostgreSQL (JSONB)	Stores machine or system states in a flexible JSON format.
Action	PostgreSQL (JSONB)	Stores commands or actions in a flexible JSON format.

Next

• Connect Data to UNS — How to model your plant to UNS and connect data to the model.
• Working with UNS Data — How to operate on your UNS model through MQTT and APIs.