System.tag.write a floating number

Ignition
1

Trying to write a floating number to a tag (value settings = memory & float).
Script works when the result is an integer, but will not work for a decimal. Just as trials, the division numerator/denominator will be varying tags when working, but the following will just move a zero in the tag.
dayPercTime = 3/22
system.tag.write("[.]..Perc_Of_Day/Perc_24hr_33", dayPercTime)

Have been unable to find anything relating to this problem or how to define i need the result as a floating number.

2

Hmm don't have an instance of 81 handy right now to test this but try:

dayPercTime = 3/22
system.tag.write("[.]..Perc_Of_Day/Perc_24hr_33", float(dayPercTime))
3

Had not tried the "float" there, had tried some other places, but still did not work.

4

What is the tag you are trying to write to set as?

oh sorry was in OP

5

That doesn't make a float in jython. That is integer division, which yields an integer. Try

dayPercTime = 3.0/22.0
2 Likes
6

pturmel, that worked! Now how would how would I specify a tag as a decimal(float)?

7

I should have written that question better:
How to make this work: the tag as the denominator is a floating value
dayPercTime = 1440.0/"[.]..Entry_Time_diff/Time_Diff_33"
system.tag.write("[.]..Perc_Of_Day/Perc_24hr_33", dayPercTime)

I have tried some variations, with no results:
dayPercTime = 1440.0/("[.]..Entry_Time_diff/Time_Diff_33")
system.tag.write("[.]..Perc_Of_Day/Perc_24hr_33", dayPercTime)

8

Your tag was a float. Otherwise it would have chopped off the decimals from an actual jython float.

9

You are dividing a float by a string. Strings containing tag paths do not magically turn into the tag value. Use some flavor of system.tag.read*().

10

You RULE!!!
This is what I changed the script to:
difference = system.tag.read("[.]..Entry_Time_diff/Time_Diff_33").value
dayPercTime = 1440.0/difference
system.tag.write("[.]..Perc_Of_Day/Perc_24hr_33", dayPercTime)