error "iDummyBitOffset == -1"

2020-02-27T21:40:38.089000Z

Might I add one thing you are checking a constant "size" defined as 0 if it is greater than > 0 ? The constant will not change?

error "iDummyBitOffset == -1"

2020-02-27T21:40:33.945000Z

LOL

you define an array with -1 members
if size = 0 then this is fault.
v : ARRAY[1..size] OF INT;
if you change the 1 to a zero always 1 member will be made.
that is the minimum.
you can not create an array with 0

error "iDummyBitOffset == -1"

2020-02-27T21:40:32.439000Z

Hi,
I am using Codesys for ABB.
The editor crashes and I find this error when, in simulation mode, I just try to open and visualize a module containing a vector with size 0. The error appears even when you login in simulation, without running the project.

The reason why I have a vector with size 0 is simply because I want to generalize the modules of my own library: I set the size of the vector to 0 on the PLCs where I don't need to use that vector, instead of commenting code around the imported module.

Here there is a simple code that reproduces the crash:

VAR CONSTANT
size : INT := 0; ( size >= 1: no problems )
END_VAR

VAR
i : INT;
v : ARRAY[1..size] OF INT;
END_VAR

( PLC_PRG: )
IF size>0 THEN ( this IF should be enough to avoid an erroneous access to v[1] e v[0] )
FOR i:=1 TO size DO ( but codesys crashes anyway when you login )
v[i] := 1;
END_FOR
END_IF

Strange is that this error appears only when I debug the code: I manage to download this code on a PLC and the program run! Only the editor crashes..

I would really appreciate every opinion on this matter!
Thank's!

vector.pro [103.11 KiB]

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