scl fc and db with array of udt

I'm trying to get started with SCL.

qOut1:=WORD_TO_INT(DB50.DW0);
qOut2:=WORD_TO_INT("DB Cascade order".DW0);
qOut3:=WORD_TO_INT("DB Cascade order".DW[iIndex]);

The first to outputs are working. The third does not work. What am I missing here?

I have several list in several db's. I need to perform calculations in these lists. For instance:

Motorspeed(1)=Motorspeed(2)+Delta(1)

Motorspeed is a db with an array of reals. And Delta is als a db with an array of reals.

I need to loop through this calculation in steps. So on cycle calculate motor 1 to 10, next cycle calculate motor 11 to 20. etc...

Can you guys give me some tips?

Is iIndex initialised ?

If so, then I am not sure what goes wrong, but I strongly advice you to program everything symbolically.

For example:
qOut3:=WORD_TO_INT("DB Cascade order".WordArray[iIndex]);
WordArray is then defined in the UDT.

Here's a quick example (just for syntax) showing an array of udts being accessed:

iIndex is defined as an input of the FC and is of the type INT.

My UDT has a structure like this:

Struct
Follows_item_nr INT
end struct

The DB is:

Item Array[1..50]
of udt53

So I have symbolic names like:

DB Cascade order.Item[3].follows_item_nr

Thanx L D[AR2,p#0.0]

I'll give it a try. It compiles ok, so I just need to modify it to use the symbolic names.

Werner said:

Thanx L D[AR2,p#0.0]

I'll give it a try. It compiles ok, so I just need to modify it to use the symbolic names.

Click to expand...

Its working now. I also created an FB in this way. Thank you for the information. What I am missing is how to add comments to the inputs / outputs of an FC or FB. Do you know how to do that?

If you mean the hint text that appears when you hover over the parameter name when you call the block, then the following works:

Great!! I can't believe that I could have worked without scl for so long. This will save a lot of time!

One other question: Debugging. I have inserted some break points, I set the operation mode to test operation. I have compiled the block again and downloaded it to the plc simulator. When I hit the monitor button I get the message: Cannot test block. Debug info was not generated. What does this mean and how can I solve this problem?

It is an option in the SCL editor.
Options .. Customize .. Compiler tab.. Create debug info.

Thanks, I got it working. This has saved me three days of pointer programming.