What the IM 365 Does in the Rack
The Siemens 6ES7365-0BA00-0AA0 is the IM 365 interface module that connects a second expansion rack to an S7-300 CPU without needing a separate bus cable or external power supply on the expansion side — the module and its included 1-meter ribbon cable carry both the I/O bus and 5 VDC backplane power between racks.
What's in the Box
The IM 365 ships as a pair of modules — one for the central rack, one for the expansion rack — plus the 1-meter connecting cable that links them. The IM 365 draws its power through the cable from the central rack's backplane bus.