Description
The Siemens 3RK1922-2BA00 is a high-performance backplane bus module manufactured by Siemens AG, serving as the foundational communication backbone for ET 200pro motor starter systems and SIRIUS 3SK1/3SK2 safety controller expansions. This 110mm rear panel bus module provides the physical and electrical interface that enables modular, scalable industrial control architectures without the complexity of traditional hardwiring.
The Siemens 3RK1922-2BA00 eliminates hundreds of individual wire terminations by replacing them with a single backplane bus structure, dramatically reducing cabinet space requirements and installation time while significantly improving system reliability. As an active product with PM300 lifecycle status, this module remains fully supported and available from Siemens.
Application Scenarios
At a European automotive parts manufacturer, a safety control cabinet for a robotic welding cell contained over 200 individual wire terminations connecting emergency stop buttons, safety door switches, and light curtains to discrete relay circuits. Each logic change required hours of rewiring and documentation updates. By deploying the Siemens 3RK1922-2BA00 as the backplane foundation for a SIRIUS 3SK2 safety controller system, the engineering team reduced cabinet wiring by 80% and cut commissioning time from three days to just six hours. When a safety I/O module failed during production, the Siemens 3RK1922-2BA00 supported hot-swap replacement without stopping the line, saving an estimated $15,000 in downtime costs.
Whether used as the base for ET 200pro distributed motor starter installations or as the expansion backbone for 3SK safety controllers, the Siemens 3RK1922-2BA00 delivers the modular flexibility and reliability that modern industrial automation demands.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3RK1922-2BA00 (Market number: 3RK1 922-2BA00) |
| Manufacturer | Siemens AG |
| Product Category | Backplane Bus Module / Rear Panel Bus Module |
| Length | 110 mm (standard size) |
| Compatible Systems | ET 200pro motor starter isolator modules; ASM disconnection module 400V; 3SK1/3SK2 safety controllers |
| Supply Voltage | 24 V DC |
| Typical Power Consumption | <1 W (backplane only) |
| Net Weight | 0.242 – 0.257 kg |
| Front Protection Class | IP00 (finger-safe touch protection) |
| Operating Temperature | -25°C to +55°C |
| Storage Temperature | -40°C to +70°C |
| Mounting | 35 mm DIN rail (EN 60715) |
| RoHS Compliance | Since May 1, 2012 |
| Certifications | CE, cULus, EAC, UKCA, RCM |
| Country of Origin | Romania |
Technical Principles and Innovative Values
Innovation Point 1: Internal Bus Architecture Replaces Hardwiring
Traditional safety and motor control circuits require individual wire runs from each field device to the controller’s discrete terminals—a practice that consumes cabinet space, increases labor costs, and multiplies potential failure points. The Siemens 3RK1922-2BA00 replaces this approach with an internal backplane bus that carries both power and communication signals between modules. When a module is inserted, the system automatically recognizes it without any addressing configuration, reducing installation time by over 50% and eliminating hundreds of terminal connections.
Innovation Point 2: Differential Signal Transmission for EMI Immunity
The Siemens 3RK1922-2BA00 employs differential signal transmission across its internal safety bus, providing exceptional immunity to electromagnetic interference (EMI). In environments crowded with variable-frequency drives and servo amplifiers—common sources of electrical noise that can cause false trips in safety systems—the backplane maintains signal integrity and prevents nuisance shutdowns. This design ensures the safety system responds only to genuine faults, not electrical noise.
Innovation Point 3: Hot-Swap Capability Enables Uninterrupted Operation
A critical innovation of the Siemens 3RK1922-2BA00 is its support for hot-swapping I/O modules. When a safety input or output module fails in a continuous production environment—such as chemical processing or food and beverage manufacturing—technicians can remove and replace the module while the system remains operational. The Siemens 3RK1922-2BA00 automatically re-initializes the new module, restoring full safety functionality without production interruption.
Innovation Point 4: Dual-Platform Compatibility
Unlike single-purpose backplane modules, the Siemens 3RK1922-2BA00 serves two distinct application platforms: as the expansion backbone for SIRIUS 3SK1/3SK2 safety controllers (supporting up to eight I/O modules) and as the bus interface for ET 200pro motor starter isolator modules and ASM disconnection modules rated for 400V applications. This versatility simplifies inventory management and enables consistent spare parts stocking across multiple system types.
