How:Access slave diagnostics on another Master

[Guest hurler]

Hi, I was just wondering is it possible to get diagnostic data from a slave that is linked to another master. I have a CPU315-2DP and a CPU314 with CPU342-5 acting as master on a DP Profibus Network. At the moment, in order to get diagnostic data on the CPU315 I can call up SFC13 access the data using the diagnostic number assigned using Simatic. For the CPU314 I call up the diagnostics by using FC3 using the actual Slave number. Is there anyway that I can acccess each masters slaves from the other master. If it's not possible directly can I use a DP/DP Coupler so that the two masters can communicate and access the diagnostic info indirectly. For a matter of interest if I had two CPU315's is this possible?. Appreciate any feedback Thanks