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The 6ES7400-1JA11-0AA0 is a UR2 aluminum rack-mount unit for SIMATIC S7-400 automation systems. It provides nine module slots, primarily for building central controllers or expansion units, and serves as the core mechanical foundation for connecting modules and providing the backplane bus.
Dual Backplane Bus Architecture
High-Rigidity & Low Thermal Resistance
Supports two redundant power supplies with load sharing
As a high-availability physical foundation within the SIMATIC S7-400 controller ecosystem, this 9-slot UR2 aluminum rack establishes a robust backplane environment for central processing units, power supplies, and critical communication processors. The integration of separate P-bus peripheral data rails and K-bus communication linkages ensures deterministic parallel data transfer, preventing high-bandwidth communication traffic from delaying localized I/O processing loops. When paired with dual redundant power supply modules, the integrated electrical terminals execute microsecond-level load current sharing to secure continuous automation execution if a primary feeding circuit encounters a sudden outage. The structural aluminum frame provides exceptional low thermal resistance by acting as a passive heat-dissipating base, while its high mechanical resistance to vibration prevents connection pins from loosening near heavy industrial machinery. This rugged configuration transforms the hardware rack into an ideal spare part for maintaining absolute uptime across demanding process automation platforms, including petrochemical control systems, modern rolling mills, power plants, and maritime hulls.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Siemens 6ES7400-1JA11-0AA0 UR2 Central Rack Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Petrochemicals & Refining
Serves as the main base for central control systems in large refineries and ethylene plants, housing redundant CPUs to execute continuous, highly secure control over tens of thousands of temperature, pressure, and flow loops.
Thermal & Nuclear Power
Utilized in plant Data Acquisition Systems, Boiler Management Systems, and Digital Electric Hydraulic control systems. The 18 high-capacity slots centrally manage a vast number of complex analog I/O modules.
Metallurgy & Large Rolling Mills
Deployed in blast furnace automation, hot rolling, or cold rolling main production lines in steel mills. It leverages ultra-fast backplane bus speeds to achieve multi-axis drive synchronization and millisecond-level high-speed logic control.
Semiconductor
Applied in wafer fab Facility Monitoring and Control Systems, centrally monitoring bulk gas supply, Ultra-Pure Water systems, and large-space cleanroom HVAC systems to guarantee absolute stability of the manufacturing environment.
Urban Rail Transit
Integrated into the central controllers of subway Integrated Supervisory Control Systems or Power Supervisory Control and Data Acquisition in main substations, handling equipment monitoring and massive signal interlocking across all line stations.
When utilizing the 6ES7400-1JA11-0AA0 rack, it must be mounted vertically with at least a 30mm clearance at the top and bottom for ventilation, and hot-swapping central modules is strictly prohibited to prevent a CPU STOP. The metal chassis must be grounded using a wire of at least 10mm², and unused empty slots should be fitted with dedicated covers to shield against conductive dust that could short-circuit the backplane bus. Due to its large slot capacity, total power consumption must be meticulously calculated against the power supply unit's limits, and caution must be exercised during physical relocation or maintenance to avoid touching or bending the backplane connector pins.
It is a UR1 standard central rack (9 slots) for the Siemens SIMATIC S7-400 PLC series.
How do you use the 6ES7400-1JA11-0AA0?
First, mount the rack vertically onto the control cabinet's rail or backplate using screws. Then, insert and secure S7-400 modules, such as the power supply (typically in Slot 1 on the far left) and the CPU, directly into the slots via the integrated backplane bus, and finally complete the external wiring.
What backplane buses are integrated into 6ES7400-1JA11-0AA0?
It features two built-in buses: the P-bus (Peripheral bus) for high-speed parallel data exchange with I/O modules, and the K-bus (Communication bus) for handling large volumes of data communication between the CPU and communication processors.
Does 6ES7400-1JA11-0AA0 support dual-hot backup (H-system) redundant configurations?
Not directly. S7-400H redundant systems require a special dual-segmented isolated rack (such as UR2-H with 18 slots divided into two segments). The 6ES7400-1JA11-0AA0 is a single-segment standard rack primarily used for standard (non-redundant) configurations.
Does 6ES7400-1JA11-0AA0 require a standalone 24V DC power supply connection?
The rack itself is a passive component and does not require an independent power connection. The required operational voltages (5V DC and 24V DC) for the backplane bus are delivered directly by the S7-400 Power Supply (PS) module plugged into Slot 1.
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