Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Manuel d'utilisateur Page 138

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 164
  • Table des matières
  • DEPANNAGE
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 137
FactoryTalk Historian DataLink User Guide
130
Returns
See specific information for PICalcVal() outcodes (page 124).
Example:
The following calculates a time-weighted total for the expression
'cdf144'+'cdt158' from yesterday to today from the default
FactoryTalk Historian server:
=PIAdvCalcExpVal("'cdf144'+'cdt158'","y","t","total","time-
weighted","compressed","10m",50,1,4,)
The result is multiplied by 1. Since compressed is the specified sampling
mode, the sampling frequency is ignored and the expression will be
sampled at the combined compressed events of cdf144 and cdt158.
The minpctgood is 50 percent so result will only be displayed if
percent good is 50 percent or greater. The percent good is returned next to
the total.
PIAdvCalcExpFilVal()
Retrieves a filtered, calculated FactoryTalk Historian point value based on
an expression, using the following syntax:
PIAdvCalcExpFilVal(expression, stime, etime, filtexp, mode,
calcbasis, sampmode, sampfreq, minpctgood, cfactor, outcode,
PIServer)
Arguments
Argument
Explanation
expression (string)
A FactoryTalk Historian calculation expression.
stime (string)
The start time for the range of calculation (in FactoryTalk Historian
time format).
etime (string)
The end time (in FactoryTalk Historian time format).
filtexp (string)
The filter expression used to filter results.
Vue de la page 137
1 2 ... 133 134 135 136 137 138 139 140 141 142 143 ... 163 164

Commentaires sur ces manuels

Pas de commentaire