Siemens 6ES7400-1TA00-0AA0 Rack UR1

18-Slot Universal Rack for S7-400 and C7-400 Systems

The 6ES7400-1TA00-0AA0 functions as the Universal Rack UR1 for the SIMATIC S7-400 and C7-400 automation platforms . This rack provides 18 slots for mounting various S7-400 modules, including power supplies, CPUs, communication processors, and I/O modules . It serves as the mechanical backbone of your S7-400 system, providing both power distribution and backplane bus connectivity . The integrated backplane bus enables high-speed data exchange between all installed modules . Furthermore, this rack supports both segmented and non-segmented bus configurations, offering flexibility for complex system architectures .

Technical Specifications

The table below details the key technical parameters for the 6ES7400-1TA00-0AA0 rack UR1.

Parameter	Specification
Manufacturer	Siemens
Product Type	Universal Rack (UR1)
Series	SIMATIC S7-400
Number of Slots	18
Backplane Bus	Integrated P and K buses
Segmented Bus	Yes, with 3 segments (6 slots each)
Electrical Isolation	500 V DC between reference and chassis ground
Max. Component Current	20 A (through backplane)
Max. Component Supply	10 A (via power supply)
Dimensions (W x H x D)	482.5 mm x 262.5 mm x 50 mm
Net Weight	Approx. 1.95 kg
Mounting	19-inch rack or control cabinet
Operating Temperature	0 to 60 °C
Protection Rating	IP20

Slot Configuration and System Architecture

The 6ES7400-1TA00-0AA0 features 18 slots with an integrated backplane bus that connects all modules in the rack. It supports segmented bus operation, dividing the slots into three segments of 6 slots each for advanced system configurations . Users can insert the power supply module in the first slot (leftmost position), which then supplies power to the backplane bus . Consequently, the 6ES7400-1TA00-0AA0 provides the structural foundation for building reliable, high-performance automation systems in complex industrial environments.