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This (field/alarm number)
THIS
Holds the index number of the current field or alarm
Description
THIS
THIS is useful to self-reference a field or alarm. For example to let a field self-increment, the following code can be used:
f(THIS)
THIS is also useful in reverse math expressions to scale the field value to a suitable register value. This example scales a 0-10 mA value in the field to uA and offsets it to industry standard 4-20mA.
f(THIS)*1600+4000
Parameters
Not applicable
Return value
Returns the index value of the current field or alarm.