{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://api-evangelist.github.io/rockwell-factorytalk/json-schema/rockwell-factorytalk-tag-schema.json",
  "title": "Rockwell FactoryTalk Tag",
  "description": "Schema for a Rockwell FactoryTalk Optix tag (process variable), representing a named data point in an industrial automation system.",
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "description": "Fully qualified tag name (may use dot notation for nested tags)"
    },
    "displayName": {
      "type": "string",
      "description": "Human-readable display name"
    },
    "description": {
      "type": "string",
      "description": "Tag description"
    },
    "dataType": {
      "type": "string",
      "enum": ["Bool", "Int16", "Int32", "Int64", "UInt16", "UInt32", "UInt64", "Float", "Double", "String", "DateTime"],
      "description": "Tag data type"
    },
    "engineeringUnit": {
      "type": "string",
      "description": "Unit of measure (e.g., RPM, °C, bar, m/s)"
    },
    "readOnly": {
      "type": "boolean",
      "description": "True if the tag cannot be written via the API"
    },
    "alarmEnabled": {
      "type": "boolean",
      "description": "True if alarm conditions are configured for this tag"
    },
    "deadband": {
      "type": ["number", "null"],
      "description": "Deadband value for filtering minor value changes"
    },
    "currentValue": {
      "$ref": "#/$defs/TagValue"
    }
  },
  "required": ["name", "dataType"],
  "$defs": {
    "TagValue": {
      "type": "object",
      "description": "Current tag value with timestamp and quality",
      "properties": {
        "name": {
          "type": "string"
        },
        "value": {
          "description": "Current value (type matches tag dataType)"
        },
        "quality": {
          "type": "string",
          "enum": ["GOOD", "BAD", "UNCERTAIN", "COMM_FAILURE"],
          "description": "Data quality status"
        },
        "timestamp": {
          "type": "string",
          "format": "date-time",
          "description": "Timestamp of the current value"
        }
      },
      "required": ["timestamp", "quality"]
    }
  },
  "examples": [
    {
      "name": "Conveyor1.Speed",
      "displayName": "Conveyor 1 Speed",
      "description": "Conveyor belt 1 speed in meters per minute",
      "dataType": "Float",
      "engineeringUnit": "m/min",
      "readOnly": false,
      "alarmEnabled": true,
      "deadband": 0.5,
      "currentValue": {
        "name": "Conveyor1.Speed",
        "value": 45.2,
        "quality": "GOOD",
        "timestamp": "2026-03-18T14:32:00Z"
      }
    }
  ]
}