Greetings dluebbert ...
and welcome to the forum ...
if you need detailed help, just post a DETAILED description of your system hardware and list the appropriate IP addresses, module types, slot locations, how much data you need to transfer, etc. ... if you’ll tell us EVERYTHING, then we can probably duplicate your setup in the lab and provide the completed program for you ...
basic idea: the more we know, the more we can help ...
your original post didn't specify one major issue, so here's a quick question: do you want the SLC processor’s program to contain the MSG instruction? ... or will the MSG instruction be contained in the ControlLogix processor’s program? ... we can transfer the data either way - but it makes a big difference in how we have to set things up ...