his-point – Project Haystack

def

his-point

Historized point with a history log of timestamp/value pairs. Points marked as historized indicate the system can response to queries via the hisRead operation to return a trend log of timestamp/value pairs.

There are typically two mechanisms for historization:

  • the local system performs the historization by logging the point's curVal to local storage
  • in overlay systems a downstream device performs the historization and the local system synchronizes the history data in batch on a periodic basis

Also see Points chapter.

conjunct

his

Supports historization of data

point

Data point such as a sensor or actuator

meta

usage

his  point

supertypes

marker

Marker labels a dict with typing information

    entity

Top-level dicts with a unique identifier

        point

Data point such as a sensor or actuator

tags

cur

Supports current value

dis

Display name for an entity

enum

Defines an eumeration of string key names

equipRef

Reference to equip which contains this entity

his

Supports historization of data

hisErr

Error description when hisStatus indicates error condition

hisMode

Indicates the way that history data is collected for a point

hisStatus

Status of point's history collection or synchronization

hisTotalized

Indicates values which are a continuous stream of totalization

id

Defines the unique identifier of an entity in system using a ref value type

kind

Kind name used before Haystack 4.0 to identity data types

maxVal

Inclusive maximum for a numeric value

minVal

Inclusive minimum for a numeric value

siteRef

Reference to site which contains the entity

spaceRef

Reference to space which contains this entity

tz

Timezone identifier from standard timezone database

unit

Unit identifier from standard unit database

vfd

Variable-frequency drive

writable

Supports writing data