What this cable duct does in an S7-400 rack
The 6ES7408-0TA00-0AA0 is a SIMATIC S7-400 cable duct designed specifically for the 18-slot rack of that system. It routes and organises the wiring between the backplane and the I/O modules, keeping the panel tidy and the airflow clear. At 482.5 mm wide, it spans the full width of the 18-slot rack, so the cables lay in without bunching at the ends. The 235 mm depth gives enough room for the module wiring harnesses to fold behind the front connector without straining the backplane pins. Height is 109.5 mm, matching the standard S7-400 module envelope. The duct mounts directly onto the rack — no adapter plate needed.
Panel fit and physical integration
The 482.5 mm width is the critical dimension for panel layout — it dictates the horizontal space the rack occupies. The 235 mm depth means the duct protrudes that far from the rack face; plan the enclosure depth to leave clearance for the wiring behind the duct.
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