Connecting 2 D0-06's together

[brian101]

Every once in a while I have been asked to add 1 or 2 more devices(I/O) to a D0-06 that has no room for that particular device. How can I link two 06's together so that I can use only 1 H0-ECOM100 and the same panel? Any help would be apprieciated.
Thanks...

[b_carlton]

Group very slowly changing inputs and outputs on the second D006. Link together, crossing R/T, between the Port 2's. Use DirectNet messaging with the original CPU (the one with the ECOM) as master to read inputs (directly) and to affect a set of C bits which are used my a minimal (communication checking) program in the second CPU to turn on outputs.