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Technical Specifications and Physical Structure
The Siemens 6ES5188-3UH51 slot central controller, also known as the UR2-H Universal Rack, belongs to the SIMATIC S5-155U product family . This robust chassis serves as the physical foundation for high-performance S5-155U control systems. It provides 21 module slots, arranged in two segments, for accommodating the CPU, power supply, and various I/O modules . The rack measures approximately 480 mm x 280 mm x 250 mm (W x H x D) and weighs around 9.0 kg to 12.0 kg when empty . This model requires separate power supply and fan modules, which must be ordered individually .
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Model Number | 6ES5188-3UH51 |
| Product Name | UR2-H Universal Rack |
| Product Family | SIMATIC S5-155U |
| Total Slot Count | 21 (module area) + 1 (power supply) + 1 (fan) |
| Backplane Bus | S5 system bus with DIN 41612 connectors |
| Compatible Modules | S5-155U CPU, IM, SM, FM, CP |
| Cooling Method | Forced air (requires separate fan module) |
| Material | High-strength steel frame with gold-plated backplane |
| Mounting | 19-inch rack or DIN rail |
| Operating Temperature | 0°C to +60°C |
| Protection Rating | IP20 (cabinet installation) |
| Dimensions (W x H x D) | 480 x 280 x 250 mm |
| Weight (empty) | Approx. 9.0–12.0 kg |
| Certifications | CE, UL, CSA (legacy standards) |
| Product Status | Discontinued (Legacy) |
Functional Capabilities and System Architecture
The 6ES5188-3UH51 rack actively provides mechanical support and electrical interconnection for all installed modules through its integrated backplane bus. It accommodates a wide range of S5-155U components, including high-performance CPUs like the CPU 155U, interface modules, and various I/O modules . The rack’s 21-slot capacity supports large-scale automation configurations without requiring additional expansion units. The design features an independent power supply slot and a dedicated fan slot, allowing users to select appropriate power ratings and cooling solutions based on their specific system requirements . This modular approach simplifies maintenance because users can replace the power supply or fan without removing other modules.
Application Scenarios and Legacy Support
This central controller rack suits large-scale industrial applications in steel production, chemical processing, power generation, and heavy manufacturing . It integrates with S5-155U systems as the central station for controlling extensive I/O networks. The Siemens UR2-H remains a critical component for maintaining and upgrading legacy S5-155U automation infrastructure . Many facilities continue to rely on this robust chassis to sustain their existing automation systems. For system integrators, this rack provides a practical foundation for refurbishing and extending the life of S5-based control equipment.