Writing to Document Tag float value being rounded

Ignition
1

In vision, writing to Document Tag will truncate the decimal part:

image
image869×479 35.6 KB

Opening Tag:

image
image578×551 31.1 KB

Why oh why?

Ignition Version 8.1.21

2

Strange indeed.
From memory, I don't believe I've needed to jsonEncode the dictionary first. If you write your obj directly to the document tag, do you still experience the rounding error?

3

You are right, no need to convert object to jsonString. - was a result of my debuging.

But same result.

Its odd though, on tag Browser value column will show { ... 123.56} - but when I open tag, it will show like above screenshot. Hopeful its just a render issue.

I will try to do a Tag Read when I get home.

1 Like
4

I wondered the same thing. FWIW, I opened a document tag of mine (on 8.1.44) and observed the float value as-stored.
image

1 Like
5

Probably a old version issue..

When reading a document tag, I need to convert to dictionary, convert float literal to string then to float.. Otherwise, it throws error, value is not float.

Thank you.