Basic Label Numeric Formatting

[pal]

I'm a bit embarassed I didn't notice this before . I built a screen last year with a basic label for the date . The data is sent over as part of a double integer array from compact logix . The word contents for today was 17062015 . I've set the numeric format to 00:00:0000 . When the project runs , the display reads 17:06:2016  . I checked the PLC 1st - OK . Added a basic label with no changes and 17062015 displayed . I'm not a VB guru , so I wondered if the formatting is incorrect . For the moment I've added a second basic label without formatting and put it to the back , offset , with just the year showing and shortened the original  label to display the day and month only .

Paul

[Archie]

That one had me scratching my head for a minute. But here is the explanation. Before the number is formatted, it is converted from a string to a single precision float. Floating point numbers in a computer are known for their lack of precision and rounding errors. The number 17062015 after conversion to a Single became 17062016.0

The fix is to use Double precision. Edit AdvancedHMIControls\Controls\BasicLabel.vb, go to line 402, change the code to this:

                    '* 31-MAY-13, 17-JUN-15 Changed from Single to Double to prevent rounding problems
                    Dim v As Double
                    If Double.TryParse(m_Value, v) Then
                        MyBase.Text = m_Prefix & (CDbl(v) * m_ValueScaleFactor).ToString(m_Format) & m_Suffix
                    End If

[pal]

As aways Archie - thanks for the quick response and solution .

Paul

[Archie]

I appreciate very much the feedback. Every bug fix or feature addition benefits us all.