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Core Backplane Component for SIMATIC S5 Racks
The Siemens 6ES5921-3WB15 circuit board serves as the central backplane interconnection board for SIMATIC S5 mounting racks. This board provides power distribution and data bus connections to all installed modules. It supports up to 16 I/O modules in S5-115U and S5-135U configurations.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model | 6ES5921-3WB15 |
| Series | SIMATIC S5 |
| Product Type | Backplane Circuit Board / Interconnection Board |
| Compatible Racks | S5-115U, S5-135U mounting racks |
| Module Support | Up to 16 I/O modules |
| Supply Voltage | 5V DC, 24V DC |
| Data Bus | S5 backplane bus |
| Bus Structure | Parallel bus |
| Operating Temperature | 0°C to 60°C |
| Weight | 0.8 kg |
| Dimensions (W x H x D) | 480 x 310 x 2.5 mm |
| Protection Rating | IP20 |
Backplane Architecture and Data Transfer
The Siemens 6ES5921-3WB15 implements a parallel bus structure that enables fast communication between modules. This architecture ensures efficient data exchange between CPUs, I/O modules, and communication processors. The board also distributes 5V and 24V power from the power supply unit to all connected modules.
Module Connectivity
This circuit board provides physical slot connections for up to 16 S5 modules in a single rack. Each slot follows the standard S5 backplane pinout for seamless module installation. The board’s design also ensures proper signal timing and electrical characteristics across the bus system.
Installation and Construction
The board mounts directly inside the S5 mounting rack using standard hardware. Its 2.5mm thick PCB construction provides mechanical stability and consistent impedance characteristics. The 0.8 kg weight also contributes to robust rack assembly without additional support.
Application and System Integration
This board forms the backbone of S5 automation systems, enabling modular system expansion. It suits both centralized and distributed control configurations within the SIMATIC S5 family. The 0°C to 60°C operating range covers standard industrial environments for continuous operation.