Siemens 6ES7400-2JA00-0AA0 Dual-section 9-slot Redundant Rack

6ES7400-2JA00-0AA0

1. 6ES7: Standard order prefix for SIMATIC S7 PLC
2. 400: S7-400 large PLC series
3. 2JA: Rack type UR2-H (special dual-section 9-slot redundant rack)
4. 00: Steel rack version (upgraded aluminum model: 6ES7400-2JA10-0AA0)
5. 0AA0: Standard base version without special extensions

Full Product Name

SIMATIC S7-400H UR2-H central rack, equipped with two independent 9-slot backplanes (18 slots in total), specially designed for S7-400H redundant fault-tolerant systems.

2. Core Structure & Backplane Bus
3. Slot Partitioning

Left 9 slots = Rack 0 (Primary CPU system)

Right 9 slots = Rack 1 (Standby CPU system)

A metal partition is arranged in the middle to physically isolate the two sets of backplane buses.

2. Dual Bus Separation Design

P Bus (Process I/O Bus): Independent for left and right sections

C Bus (Communication Bus): Independent for left and right sections

No backplane signal crosstalk exists between the two redundant CPUs, complying with high-availability redundancy standards.

3. Rules for Installable Modules

When used as a Central Rack (CR): All S7-400 modules can be inserted (IM receiver interface modules are excluded).

When used as an Extension Rack (ER): CPUs, IM transmitter modules and IM463-2 cannot be installed.

Restriction: Power supply (PS) modules and IM461-1 receiver modules cannot be used on the same section.

3. Mechanical Dimensions & Material

4. Ambient Operating Conditions

Operating Temperature: 0℃ ~ +60℃ (vertical installation inside cabinet)

Transport / Storage Temperature: 0℃ ~ +70℃

Permissible Relative Humidity: 5%~95%, non-condensing

Vibration & Shock Resistance: Compliant with industrial standard IEC 61131-2

5. Certifications

CE, UL, FM, CCC, EAC, KC, RCM (C-TICK). Universal certifications for all industries, applicable to redundant projects in chemical, power and rail transit sectors.

6. Core Product Features
7. Integrated Redundant Base Frame

A single rack integrates two independent 9-slot backplanes. Dual-CPU redundancy of S7-400H can be realized within one cabinet without two separate racks, greatly saving cabinet space.

2. Physical Isolation for Fault Tolerance

A metal shielding partition is arranged in the middle to fully electrically isolate the backplanes of the two systems. A module fault on one side will not damage the redundant system on the other side.

3. Full Module Compatibility

Supports PS power supplies, redundant CPU41x-H, SM digital/analog I/O modules, CP communication modules, FM function modules and IM expansion interfaces.

4. Standard 19-inch Form Factor

Compatible with industrial standard control cabinets, matched with full range of S7-400 front connectors and guide rail accessories.

5. Wide Temperature Industrial Adaptability

Supports operation under wide temperature range, suitable for non-stop high-reliability scenarios such as power plants, metallurgy and oil & gas.

7. Typical Application Scenarios

Power Industry: Power plant DCS, redundant PLC for substations

Chemical Processes: Fault-tolerant control systems for fine chemical and petroleum refining

Rail Transit: Metro signal and traction redundant control

Water & Wastewater Plants: Uninterrupted process control

Large Production Lines: Non-stop redundant automation for automobile and paper-making industries

8. Distinction Between Two Models (Steel vs Aluminum)
9. 6ES7400-2JA00-0AA0: Steel UR2-H rack, old version, heavier weight, mainly supplied as stock spare parts
10. 6ES7400-2JA10-0AA0: Aluminum alloy UR2-H, new lightweight model, factory’s mainstream stock model, fully compatible with the 00 version in dimensions and slot functions, can directly replace the 00 version
11. S7-400 Full Series Rack Comparison (For Auxiliary Selection)

10. Optional Matching Accessories
11. Front Connectors: 40-pin / 20-pin spring / screw type (matched with SM I/O modules)
12. Synchronization Optical Cables: Short/long-distance synchronization fiber for S7-400H CPUs
13. IM460/IM461 expansion interface modules: Interconnection for remote extension racks
14. Power supply modules PS405/PS407: 24VDC / 120/230VAC power supply
15. Rack covers, dust baffles, mounting fasteners
16. Key Usage Restrictions
17. UR2-H is only compatible with S7-400H redundant CPUs (412H/414H/417H); standard single CPUs 412/414 cannot be configured for redundancy.
18. The left and right backplanes are powered independently. Separate PS power supplies are recommended for both sides to improve redundancy reliability.
19. Cross connection and mixed use of backplane buses between Rack 0 and Rack 1 are prohibited.
20. Only IM461 receiver modules can be used for extension racks; CPUs and IM transmitter modules are forbidden to be inserted.

Temperature Parameters of Siemens 6ES7400-2JA00-0AA0 (UR2-H Steel Redundant Rack) (Official Factory Data)

1. Normal Operating Temperature (Vertical Cabinet Installation)

0 ℃ ～ +60 ℃

> Applicable to vertical installation in standard control cabinets with good internal ventilation and no closed heat accumulation.

2. Transport / Storage Temperature (Non-operating)

0 ℃ ～ +70 ℃

Supplementary Key Notes

1. The lightweight aluminum model 6ES7400-2JA10-0AA0 of the same series has exactly the same temperature range and can be directly interchanged.
2. If multiple modules are densely arranged with poor heat dissipation inside the cabinet, the actual operating temperature is recommended to be controlled at ≤55℃ to avoid derating of CPUs and power modules caused by overheating.
3. No specification for low-temperature operation below zero; long-term operation below 0℃ will lead to poor backplane contact and abnormal module startup.
4. Humidity requirement: 5%～95%RH, non-condensing.

Storage & Transport Temperature of Siemens 6ES7400-2JA00-0AA0 (UR2-H Steel Redundant Rack) (Standard Factory Data)

Ambient Temperature for Storage & Transport

0 ℃ ～ +70 ℃

Classification of Corresponding Temperature Parameters

1. Operating temperature (powered vertical installation inside cabinet): 0 ℃ ～ +60 ℃
2. Storage & transport (unpowered storage, logistics transportation): 0 ℃ ～ +70 ℃
3. The new aluminum rack 6ES7400-2JA10-0AA0 of the same series has identical temperature range and supports direct replacement.

Supplementary Humidity Requirement

Relative humidity of storage environment: 5%～95%RH, condensation and frost are strictly prohibited.