[BUG-11697] Round function not working on tag values in expressions

Ignition Early Access
1

I might be doing something wrong. I am trying to force 1 decimal place on a value I am displaying on a label in Perspective module. I am using a tag with the float data type.

The tag “[default]Test Float” has a value of 1.23456789

This expression returns 1.23456789
{[default]Test Float}

This expression returns “Error_Configuration”
round({[default]Test Float}, 1)

This expression returns 1.2
round(1.234, 1)

This expression returns “1.23456789”
tag("[default]Test Float")

This expression returns “Error_Configuration”
round(tag("[default]Test Float"), 1)

2

You might have to cast the tag as a float. Try something like:

round(toFloat(tag("[default]Test Float")), 1)
3

Weird… it’s already a float but these 2 work.

round(toFloat({[default]Test Float}), 1)

round(toFloat(tag("[default]Test Float")), 1)

Thank you for your help.

4

Hmm. Does this work without the cast in 7.9?

5

I don’t have a 7.9 instance to test on currently. I’m not sure. I don’t recall having a problem in the past but most of my Ignition work lately has been with SQL Bridge and alarm notification.

6

Ok we’ll look into it. Might be a bug.

7

Yep, we’re already tracking this one. It’s not just the round function, it’s a more general problem in expressions.

8

For further clarification (and to track all of the Expression issues in one thread), the Expression with problems we are aware of are:

  • Aggregates > maxDate & minDate
  • All Database functions
  • All Store and Forward functions
  • Logic > coalesce
  • Logic > hasChanged
  • Math > pow
  • Math > round
  • String > split
9

Excellent, thank you.

At least we have a work around.

10

There’s a fair number of places I’ve had to use toInt() with integer constants.

11

Removing the type restrictions on expressions (and just attempting to coerce in all cases) is on the roadmap.

12

This issue was fixed in the build that was uploaded today (3/12). Please let us know if you continue to see this behavior after upgrading.

13

Will do.

Thank you.

Oh, I need to type 20 characters to post.