Siemens 6ES7400-2JA10-0AA0 S7-400 UR2 Replacement Rack

Product Overview

Siemens 6ES7400-2JA10-0AA0 S7-400 UR2 Replacement Rack: Seamless Transition from Legacy Systems

The Siemens 6ES7400-2JA10-0AA0 is an 18-slot Universal Rack (UR2) designed for the SIMATIC S7-400 platform — one of the most widely deployed high-availability PLC architectures in process automation, power generation, and heavy manufacturing. As legacy S7-400 installations approach end-of-life or require capacity expansion, this rack serves as the direct mechanical and electrical replacement for discontinued or damaged UR2 units, enabling engineers to restore or modernize their control systems with zero architectural redesign.

Whether you are migrating from an older 6ES7400-2JA00-0AA0 rack, expanding an existing S7-400 CPU 414 or CPU 416 installation, or rebuilding a control cabinet after a hardware failure, the 6ES7400-2JA10-0AA0 provides the same 18-slot backplane bus, identical power rail geometry, and full compatibility with the S7-400 module ecosystem. The rack accepts all standard S7-400 I/O modules, communication processors, and interface modules without any firmware changes or re-engineering of the existing program structure.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful rack replacement in an S7-400 system rarely involves the rack alone. During a typical retrofit or emergency swap, engineers must account for the full module population and interconnect architecture. The 6ES7400-2JA10-0AA0 is routinely deployed alongside the PS 407 10A power supply module (6ES7407-0KA02-0AA0), which slots directly into position 1 of the UR2 rack and provides the 24 V DC and 5 V DC rails required by all downstream modules. If the existing installation uses a redundant power configuration, a second PS 407 unit can be installed in the adjacent slot without any backplane modification.

CPU migration is equally straightforward. Customers upgrading from a CPU 414-2 to a CPU 416-3 PN/DP — for example, to gain additional PROFINET capacity or expanded program memory — can seat the new CPU directly into the replacement rack. The SIMATIC S7-400 CPU 416-3 PN/DP (6ES7416-3XR05-0AB0) retains the same slot-1 power interface and backplane bus protocol, so existing signal module wiring on SM 421 digital input modules and SM 431 analog input modules remains untouched.

For installations that rely on PROFIBUS DP fieldbus communication, the CP 443-5 Extended communication processor continues to operate in the new rack without any address reconfiguration, provided the DP master address and GSD file assignments are preserved in the STEP 7 hardware configuration. Similarly, sites using Industrial Ethernet will find that the CP 443-1 Advanced (6GK7443-1EX30-0XE0) retains its IP address and PROFINET device name after the rack swap, minimizing network reconfiguration time.

Where the existing system includes expansion racks connected via the IM 460-0 / IM 461-0 send/receive interface module pair, the new central rack accommodates the IM 460 in its designated slot without mechanical or electrical modification. This is particularly relevant for large-scale process control cabinets where the central rack feeds two or three ER1 or ER2 expansion racks housing additional SM 422 digital output modules or SM 432 analog output modules.

Customers decommissioning older S5-115U or S5-135U systems and migrating to S7-400 architecture will also benefit from pairing this rack with a SIMATIC S7-400 IM 153-2 interface module for ET 200M distributed I/O stations, allowing field wiring to be preserved at the marshalling cabinet while the central control logic is modernized. Signal isolators and terminal multiplier modules from the SIMATIC S7-400 accessory range can be used to bridge legacy 20 mA current loop signals into the new I/O structure without rewiring field instruments.

Retrofit Guidance FAQ

Q: Can I transfer my existing modules directly from the old rack to the 6ES7400-2JA10-0AA0 without reprogramming?
A: Yes. All S7-400 modules are hot-swappable at the backplane level. The CPU retains its program in battery-backed RAM or on a memory card (MC 952 or MC 954). After seating the CPU and I/O modules in the new rack, the STEP 7 hardware configuration will recognize the module population automatically on the next online connection, provided the slot assignments are preserved.

Q: Will the PROFIBUS DP network require reconfiguration after the rack replacement?
A: No. The PROFIBUS DP master address is stored in the CPU, not the rack. As long as the CPU module is transferred intact (or a replacement CPU is loaded with the same STEP 7 project), all slave addresses, GSD configurations, and cyclic data exchange mappings remain valid.

Q: Does the physical footprint of the 6ES7400-2JA10-0AA0 match the predecessor rack?
A: Yes. The UR2 18-slot rack dimensions are standardized across the S7-400 product family. The mounting hole pattern, DIN rail clip positions, and cable duct clearances are identical to the 6ES7400-2JA00-0AA0, so no cabinet modification or new mounting hardware is required.

Q: What power supply is recommended for this rack?
A: The PS 407 series (4A, 10A, or 20A variants) is the standard choice. Select the amperage rating based on the total current draw of your installed modules. For high-density I/O configurations with 14–16 populated slots, the 10A or 20A variant is recommended to maintain adequate derating margin.

Q: Is this rack compatible with S7-400H redundant CPU configurations?
A: The UR2 rack supports standard (non-redundant) S7-400 CPU installations. For H-system redundancy, the dedicated UR2-H rack (6ES7400-2JA10-0AA0 is not the H variant) is required. Please confirm your system architecture before ordering.

Warranty Assurance

Every 6ES7400-2JA10-0AA0 unit shipped by TOPNLMS is covered by a 12-month replacement warranty from the date of delivery. Prior to dispatch, each rack undergoes visual inspection, backplane bus continuity verification, and connector integrity checks. Units are packed in anti-static foam with original-style carton protection to prevent transit damage.

In the event of a confirmed hardware defect within the warranty period, TOPNLMS will arrange a replacement unit shipment within 3–5 business days. Our technical support team is available to assist with installation verification, STEP 7 hardware configuration questions, and compatibility confirmation before and after purchase. Stock is maintained in Xiamen, China, with express DHL/FedEx shipping available to most industrial regions globally, typically achieving 3–7 day delivery to Europe, Southeast Asia, and the Americas.

For volume procurement, OEM partnerships, or urgent emergency replacement orders, contact our sales team directly to confirm lead time and availability.