What this rack is
This is the Siemens SIMATIC S7-400 rack UR1, order code 6ES7400-1TA01-0AA0. It's the backbone for a central or distributed S7-400 system, giving you 18 slots for I/O, processors, and comms modules. Two redundant power supplies can plug in side by side, so if one PS takes a hit, the other keeps the bus alive — that's the kind of uptime a lube route or a cold chain line needs.
Rated to run from 0 °C to 70 °C ambient. That 70 °C ceiling is the real tell — most DIN-rail PLCs top out at 55 or 60 °C. If the panel sits near a hot bearing housing or a steam line, this rack keeps the bus stable where a smaller controller would throttle or drop. The 482.5 mm width and 290 mm height are 19-inch rack compatible; the 27.5 mm depth means it fits shallow enclosures without the backplane hitting the gland plate.
Where it goes in a system
The UR1 sits in a 19-inch cabinet or a sub-panel. It carries the P bus and the communication bus, so all S7-400 modules talk across the backplane without extra wiring. With 18 slots, you can pack a CPU, a couple of comm processors, and a dozen I/O slices in one chassis — no need for a second rack unless you're running a big line.
Compliance at a glance
Carries CCC, UL, FM, CE, UKCA, KC, EAC, and RCM approvals. That covers most global markets: China, North America, Europe, UK, South Korea, Russia, and Australia. One part number, one compliance set — no regional variants to track.