CLX/CpLX Array Size

[Phrog30]

Is it possible to grab an array size, either "standard" DINT, or UDT?  I know I can get the size within the PLC and send it to the app if necessary, just wondering if there is a fancy way to cut out the middle man.  Basically, I am writing some value to the PLC and want to ensure I'm within the boundaries.

Thanks,
James

[Phrog30]

Bueller....

[dmroeder]

There isn't a way to give the driver a tag name and get the array size in return.

[bachphi]

And how do you get the size within the PLC?

[dmroeder]

There is an instruction called SIZE that will return an array size

[Phrog30]

Thank you for the reply.

[bachphi]

No WAY!



Thanks.

[bachphi]

I've developed it a little further, now not only we can find the size of array, but also how much is occupied in that array. The cmdSend is a string and contain 'HELLO'.  Using FSC instruction, you can find  that there are 5 letters occupied that array.

[dmroeder]

If you want to know how many letters are in a string, just look a the .LEN property. cmdSend.LEN should = 5.

[bachphi]

It's only a simple example to demonstrate the point. You can not really use LEN to find out in a case of UDT:  PalletData[STA_1_PAL].Fail_Code[FSC.POS]>0