Cable 368, 5m – S7-300 rack interconnect
The 6ES7368-3BF00-0AA0 is a 5-meter interface cable, designated Cable 368, that connects the IM 360 and IM 361 interface modules in a Siemens S7-300 rack expansion setup. This is the link that carries the I/O bus between the central rack and an expansion rack — without it the second rack has no communication path to the CPU.
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Compatibility and fit
The 5m Cable 368 is the specific cable used between an IM 360 (central rack sender) and an IM 361 (expansion rack receiver) in the S7-300 system. The cable length determines the maximum physical distance between the two racks — 5 meters is the standard length for this pair. The connectors are keyed and lock into the IM front panel; no field termination is required.