osisoft-pi · Schema

OSIsoft PI Point

Schema for an OSIsoft PI point (tag), the fundamental data storage unit in the PI System representing a single time-series measurement.

Properties

Name Type Description
WebId string PI Web API opaque unique identifier
Id integer PI point numeric ID on the PI Data Archive
Name string PI tag name
Path string Full PI path (\\ServerName\TagName)
PointType string PI point data type
EngineeringUnits string Unit of measure (e.g., kPa, °C, m3/h)
Description string Tag description
Descriptor string Short descriptor
PointClass string PI point class (classic, base, etc.)
Zero number Zero value for analog points
Span number Span value for analog points
ExcMin number Exception minimum for compression
ExcMax number Exception maximum for compression
Step boolean True if values are step-function (digital/integer types)
Future boolean True if future-dated values are allowed
Tag string Tag name alias
Instrument string Instrument tag reference
Location1 integer Location attribute 1
Location2 integer Location attribute 2
Location3 integer Location attribute 3
Location4 integer Location attribute 4
Location5 integer Location attribute 5
View JSON Schema on GitHub

JSON Schema

osisoft-pi-point-schema.json Raw ↑ 
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/osisoft-pi/json-schema/osisoft-pi-point-schema.json",
  "title": "OSIsoft PI Point",
  "description": "Schema for an OSIsoft PI point (tag), the fundamental data storage unit in the PI System representing a single time-series measurement.",
  "type": "object",
  "properties": {
    "WebId": {
      "type": "string",
      "description": "PI Web API opaque unique identifier"
    },
    "Id": {
      "type": "integer",
      "description": "PI point numeric ID on the PI Data Archive"
    },
    "Name": {
      "type": "string",
      "maxLength": 80,
      "description": "PI tag name"
    },
    "Path": {
      "type": "string",
      "description": "Full PI path (\\\\ServerName\\TagName)"
    },
    "PointType": {
      "type": "string",
      "enum": ["Float16", "Float32", "Float64", "Int16", "Int32", "Digital", "Timestamp", "String"],
      "description": "PI point data type"
    },
    "EngineeringUnits": {
      "type": "string",
      "description": "Unit of measure (e.g., kPa, °C, m3/h)"
    },
    "Description": {
      "type": "string",
      "maxLength": 128,
      "description": "Tag description"
    },
    "Descriptor": {
      "type": "string",
      "maxLength": 32,
      "description": "Short descriptor"
    },
    "PointClass": {
      "type": "string",
      "description": "PI point class (classic, base, etc.)"
    },
    "Zero": {
      "type": "number",
      "description": "Zero value for analog points"
    },
    "Span": {
      "type": "number",
      "description": "Span value for analog points"
    },
    "ExcMin": {
      "type": "number",
      "description": "Exception minimum for compression"
    },
    "ExcMax": {
      "type": "number",
      "description": "Exception maximum for compression"
    },
    "Step": {
      "type": "boolean",
      "description": "True if values are step-function (digital/integer types)"
    },
    "Future": {
      "type": "boolean",
      "description": "True if future-dated values are allowed"
    },
    "Tag": {
      "type": "string",
      "description": "Tag name alias"
    },
    "Instrument": {
      "type": "string",
      "description": "Instrument tag reference"
    },
    "Location1": { "type": "integer", "description": "Location attribute 1" },
    "Location2": { "type": "integer", "description": "Location attribute 2" },
    "Location3": { "type": "integer", "description": "Location attribute 3" },
    "Location4": { "type": "integer", "description": "Location attribute 4" },
    "Location5": { "type": "integer", "description": "Location attribute 5" }
  },
  "required": ["WebId", "Name", "PointType"],
  "examples": [
    {
      "WebId": "P0UKSmL5GxNku5bXVjXV1zIgAAAUEkT0NPRFwtUEkxXFJFQUNUT1IuVEVNUC5QVjE",
      "Id": 1042,
      "Name": "REACTOR.TEMP.PV1",
      "Path": "\\\\PI-SERVER1\\REACTOR.TEMP.PV1",
      "PointType": "Float32",
      "EngineeringUnits": "°C",
      "Description": "Reactor 1 Temperature Process Variable",
      "Descriptor": "R1 Temp",
      "PointClass": "classic",
      "Zero": -50,
      "Span": 250,
      "Step": false,
      "Future": false
    }
  ]
}

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