Offset property

Sets or returns the value used to transform analog tag values that are read from or written to the data source. Read/write. Variant.
Syntax
Tag
.
Offset
[=
Value
]
where
Tag
 is the name of a Tag object or an expression that evaluates to a Tag object.
Value
is the offset to be assigned to the tag.
Remarks
  • Data from the data source is multiplied by the Scale factor and added to the Offset value before it is stored in the value table. The formula for this calculation is:
    FactoryTalk View value = data source value * scale factor + offset
  • Data from the value table has the Offset value subtracted from it and then divided by Scale before it is written to the data source. The formula for this calculation is:
    data source value = (FactoryTalk View value - offset)/scale factor
  • The default values are
    Scale
    = 1 and
    Offset
    = 0. Using these values, data is unchanged.
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