Set REFERENCE to 0 (null) when no longer used

2024-10-07T20:20:30.899000Z

yes, it works

Set REFERENCE to 0 (null) when no longer used

2024-10-02T11:15:56.112000Z

Did you find out if this work?

Set REFERENCE to 0 (null) when no longer used

2020-05-30T00:08:23.030000Z

ok, so I was playing around with some tests today and the code I was looking at I didn't actually try and build/run because I was missing libraries for it.

Turns out you can build and run

THIS^.refLamp REF= 0;

it is just the precomplier that complains about it. Is this a bug then in the precompiler?

Set REFERENCE to 0 (null) when no longer used

2020-05-25T17:59:40.628000Z

Is there a way to work around the error that happens when trying to set a reference to 0 after it isn't needed or is invalid? Trying to do this in codesys >= V3.5.15 results in an error. See example below. Now I could great a GVL with a bunch of unset references, but I'd end up with a large amount of null types.

METHOD FB_init : BOOL
VAR_INPUT
    bInitRetains : BOOL; // if TRUE, the retain variables are initialized (warm start / cold start)
    bInCopyCode : BOOL;  // if TRUE, the instance afterwards gets moved into the copy code (online change)
    refLamp : REFERENCE TO FB_Lamp;
    byNewLevel : BYTE;
END_VAR

IF (__ISVALIDREF(refLamp)) THEN
    THIS^.refLamp REF= refLamp;
ELSE
    THIS^.refLamp REF= 0;
END_IF
THIS^.byNewLevel := byNewLevel;

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Set REFERENCE to 0 (null) when no longer used

Set REFERENCE to 0 (null) when no longer used

Set REFERENCE to 0 (null) when no longer used

Set REFERENCE to 0 (null) when no longer used