SLC500 checksum accessible

I'm looking for a way to access logic checksum via SCADA. Is there a way to get at this, without changing the PLC code? For instance, I found that you can use a Read Program Checksum (RPC) instruction to write the program checksum to an integer... Then obviously you can get at it with SCADA. Is it stored somewhere otherwise where it can be accessed directly via a data driver? (for example, like a S: bit as in the PLC5 line...?)

Thanks!