tango-controls/TangoTickets

ATKPanel and test Device show different values for some DEV_LONG64 attributes

Closed this issue · 1 comments

alainbuteau commented

  • Test Device :
    Attribute: PLCSERVERV3/CPU315/PLCDV.1/Type_LINT
    Duration: 1 msec
    measure date: 26/02/2018 10:16:06 + 159ms
    quality: VALID
    Read: -994074541749903631

  • ATKPAnel value : is slightly different -994074541749903616 instead of -994074541749903631 which is expected and displayed in Test Device

faranguiss-poncet commented

Hello,
All numeric values are converted into double values inside ATK. Consequently we don't have enough space in a double mantissa to encode 64 bits integer values.

This issue cannot be fixed without a huge work in many classes of ATK library.

I close this issue without fixing.