GX Works 2 System Variable Use

[Colin Carpenter 10]

Please could someone tell if it's possible using GX Works 2 to find out how many  System Variables (M bits and D registers) have been used when I compile my programme, so that I can get a feel for the number left for any future expansion.

IEC Developer would always display the values after a "Build", but I just can't find the information in GX Works.

I must be missing something obvious, but just can't seem to find it.

Thanks

 

[plcdp 11]

Hello,

Under the Find/Relace tab there is "Device List". This will show the used devices in the program.

Hope this helps,

 

Dave

[Colin Carpenter 10]

Thanks for that Dave,

I had a look at that and it seems like GX Works 2 allocates System Variable M Coils starting at the top address of the range and then working backwards. In my case the range from M8191 to M6613 is currently used, meaning that I now have 1,663 spare addresses (as I set the start point for system variables at M5000) before having to look at re-allocating ranges.

I'm constantly finding that GX Works 2, while better in some respects, has just lost a few of the more useful, simple functions that IEC has had for many years.

Cheers

 

[Gambit 332]

The Device list will show you all used devices. If you want to know what the compiler used just check your output window after a compile

GX will always use the last devices from the ones reserved in the settings as a user will probably start from the beginning.

FYI If you use an iQ-R you will not need to reserve system vars as you don't need device addresses anymore, but you can if you want to

[Colin Carpenter 10]

Thanks, I tried check my output window after a "Build" and even a "Rebuild All", but it shows nothing other than a few warnings. 

Do I have to enable something to get it to show me bits and words that have been used in the compile, as happens in the IEC Developer compile?