UR2-H rack for redundant S7-400H systems
The Siemens 6ES7400-2JA00-0AA0 is the UR2-H rack for the SIMATIC S7-400H redundant automation system, designed to house two separate S7-400 CPUs and their I/O in a single 19-inch chassis. It provides 18 slots arranged as two independent segments of 9 slots each, with a separated P bus and communication bus — this isolation is what allows a redundant CPU pair to operate without bus contention while sharing the same backplane.
The rack measures 482.5 mm wide by 290 mm high by 27.5 mm deep — the 482.5 mm width is the standard 19-inch rack mount dimension, so it bolts directly into a 19-inch cabinet without adaptor brackets. Rated for 0 °C to 70 °C ambient operation, so it lives comfortably in a ventilated enclosure — no derating concerns at typical control-room temperatures.
Carries CE, UKCA, UL, FM, KC, EAC, and RCM approvals, plus CCC (China Compulsory Certification) — cleared for global projects without separate certification runs.