Another unexpected GE ST problem

radsett · May 31, 2008

I have a simple initialization loop

FOR BS_i:=0 TO (BS_CONC_LEVEL_CONTROL - 1) DO
BSHistorySt_Return_LR[BS_i] := DONT_CARE;
END_FOR;

That gives an error " expected := " pointing at the assignment inside the loop. I've tried
- using a second variable for indexing in the array
- recoding as a while loop

all without success. Finally I tried eliminating the loop and reduced it to

BS_i := 0;
BSHistorySt_Return_LR[BS_i] := DONT_CARE;

I still get the same error.

I do have a query in to GE but they are not replying as of yet.

Robert

L D[AR2P#0.0] · May 31, 2008

What happens if you use another but shorter array name instead of BSHistorySt_Return_LR ?

radsett · May 31, 2008

Good question.

I quickly tried

BS_i := 0;
BS[BS_i] := 0;
BS[BS_i] := DONT_CARE;

Same error on both of the array assignment lines.

Robert

L D[AR2P#0.0] · May 31, 2008

What data type is the BS array ?

Can you post the complete (but cut down) code that fails to compile.

radsett · May 31, 2008

This is it (both lines 2 and 3 fail)

BS_i := 0;
BS[BS_i] := 0;
BS[BS_i] := DONT_CARE;

BS_i is a UINT
BS is an array of 4 INT
DONT_CARE is a INT

(Proficy ME doen't include variable definitions in the source)

Robert

L D[AR2P#0.0] · May 31, 2008

Is a UINT the correct variable type for an array index ?

How about

Code:

BS[1]:=0;

radsett · May 31, 2008

L D[AR2 said:
Is a UINT the correct variable type for an array index ?

I actually changed it from INT to UINT checking that out. Either give the same error

L D[AR2 said:
How about

Code:

BS[1]:=0;

That does work. But it's obviously useless inside a loop.

Robert

L D[AR2P#0.0] · May 31, 2008

Just throwing up ideas, maybe the array index variable has to be of type SINT (short int) ?

radsett · May 31, 2008

L D[AR2 said:
Just throwing up ideas, maybe the array index variable has to be of type SINT (short int) ?

It's worth a try.

GE doesn't have an SINT type but I checked a few others, So far for the index variable I've used

BYTE
INT
UINT
DINT
WORD
DWORD

I think I've covered all the integer types.

Robert

L D[AR2P#0.0] · May 31, 2008

...... I've run out of suggestions (except maybe the GE ST implementation does not support variable array accesses)

radsett · May 31, 2008

I'm beginning to suspect that myself.

That will raise the question, why support arrays at all? I don't see an advantage of

a[3]

over

a_3

Hopefully GE will get back to me.

Thanks for your suggestions. At least we managed to eliminate a few possibilities.

Robert

radsett · Jun 4, 2008

OK, I got my answer from GE. GE doesn't support the use of another variable to index an array. Essentially that means they don't support arrays.

I've had to write a function block (since they don't support functions either) to provide access to each array by essentially matching the index to an offset and then referencing the array with a constant.

The mind boggles.

Robert

Another unexpected GE ST problem

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