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BIT type in persistent memory

Engineering 🇬🇧
tvm
2022-03-16
2022-03-17

  • tvm - 2022-03-16

    I have a very basic program, consisting of a single structure in persistent memory:

    TYPE SETPOINTS :
STRUCT
    Bit0:           BIT;
    Bit1:           BIT;
    Bit2:           BIT;
    Bit3:           BIT;
    Bit4:           BIT;
    Bit5:           BIT;
    Bit6:           BIT;
    Bit7:           BIT;
END_STRUCT                           
END_TYPE

PROGRAM SR_Main
VAR PERSISTENT
    Setpt:          SETPOINTS;
END_VAR

{attribute 'qualified_only'}
VAR_GLOBAL PERSISTENT RETAIN
    // Generated instance path of persistent variable
    SR_Main.Setpt: SETPOINTS;
END_VAR

    Is there any reason that a BIT type cannot be stored in persistent memory? Any considerations for their use? The program compiles fine, but hangs up during a download. Remove the declaration from the PersistentVars GVL and it works fine.

    thanks

     

  • tvm - 2022-03-17

    In case anyone else runs into this problem, this is a bug in Schneider Electric's latest release of Machine Expert (v2.0.2) BIT types can't be used in Persistent Variables

     

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