SLC Upgrade gives program errors

[woodward_uk]

Hi there. I would appreciate anyones help with the following problem ......

We have recently installed an Allen Bradley PLC system which uses a 1747-L551 Processor (Ser B, Rev 4, OS501). However with the many additions that the client had requested we ran out of user memory. We therefore decided to upgrade to a 1747-L552 (Ser C, Rev A, OS501) Processor.

When I changed the processor type in RSLogix (offline) it asked me if I wanted to resize data tables (as expected) which I confirmed, but when it recompiled the program I received the following error;

"ERROR: BTW instruction is not valid on the currently selected processor -> 1747-L552".

This message was displayed for all BTW and BTR instructions (which I use for analogue cards in my remote I\O racks through 1747-SN & ASB modules.

I realise that Block Transfer instructions must still be supported by SLC processors but can find no reason for the messages.

regards
Steve

 

[OZEE]

Make sure you select 1747-L552C, not 1747-L552. The "not-C" versions do not support BTW/BTR, but "C" versions do. You have to select the right processor in the controller properties. (I just tested it and confirmed this...)

 

[Ken Moore]

I think you made the wrong selection, exactly which selection item did you choose in the software.

 

[woodward_uk]

Thanks Guys

As you said I had selected the first 552 that was visble in the drop down list, the Series C was further up and out of sight. Trying to do too many things at once!!!

thanks again

Steve

 

[trueninjalo]

I know this is old but Thank You very much. This fixed my issue.