Product Description
The Siemens 6DD1682-0BC4 is a SIMADYN D subrack (model SR12.4) from Siemens’ high-performance digital automation system, designed as the foundational chassis for housing processor modules, I/O modules, and power supplies in drive and motion control applications . This 12-slot subrack operates on a 115/230V AC power supply and employs ACNATURAL CONVECTION cooling, eliminating the need for fans and moving parts .
The 6DD1682-0BC4 delivers a robust, zero-maintenance platform for SIMADYN D systems, making it the ideal choice for demanding industrial environments where reliability, silence, and resistance to dust and contaminants are paramount .
Application Scenarios
In a steel rolling mill, the control system was plagued by frequent failures of fan-cooled subracks due to dust and metal particle ingestion. After replacing the failed chassis with the Siemens 6DD1682-0BC4, the plant achieved uninterrupted operation in the harsh, particulate-filled environment. The fanless design completely eliminated the failure mode associated with cooling fans, and the sealed subrack protected sensitive processor and I/O modules. The plant reported a 40% reduction in control system-related downtime and praised the “fit and forget” reliability of the 6DD1682-0BC4 .
The 6DD1682-0BC4 addresses critical industrial pain points:
- Need for reliable subrack platforms in dusty, high-EMI environments
- Requirement for silent operation in noise-sensitive areas
- Demand for zero-maintenance infrastructure to reduce operational costs
- Requirement for flexible module placement with 12 slots and dual-bus support
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6DD1682-0BC4 (SR12.4) |
| Manufacturer | Siemens |
| Product Category | SIMADYN D Subrack / System Chassis |
| Number of Slots | 12 slots (233.4 x 220 mm board format per IEC 297) |
| Supply Voltage | 115/230V AC (with integrated SP23.5 power supply) |
| Cooling Method | ACNATURAL CONVECTION — Fanless, passive cooling (zero moving parts) |
| Bus Compatibility | L-Bus and C-Bus (dual-bus backplane for data and communication) |
| Noise Level | 0 dB (completely silent operation) |
| Environmental Protection | Supports IP54/IP65 sealed enclosure integration |
| Operating Temperature | -20°C to +50°C |
| Net Weight | Approx. 8.0 kg |
| Packaging Dimensions | 375 x 610 x 440 mm |
| Product Status | Discontinued (PM500: End of Product Lifecycle since October 2017) |
| Approvals | CE, UL |
Technical Principles and Innovative Values
Innovation Point 1: Natural Convection Cooling (ACNATURAL)
The Siemens 6DD1682-0BC4 utilizes a passive cooling design based on thermal physics principles—hot air rises, cool air descends—to dissipate heat without any moving parts . This eliminates the failure points associated with fans, such as bearing wear, dust accumulation, and motor burnout. The “ACNATURAL” designation signifies that the subrack is engineered for self-convection, requiring no forced airflow and achieving a 0 dB noise level .
Innovation Point 2: Integrated Power Supply with Battery Backup
The 6DD1682-0BC4 is supplied with an integrated SP23.5 power supply unit, which includes a battery insert for buffering the system during voltage interruptions, preventing data loss . Unlike separate subrack and power supply configurations, the 6DD1682-0BC4 offers a complete, pre-configured chassis solution.
Innovation Point 3: Dual-Bus Architecture for High-Performance Data Exchange
Equipped with both L-Bus (local bus for high-speed data exchange within the rack) and C-Bus (communication bus for inter-rack or inter-system communication), the 6DD1682-0BC4 supports the full SIMADYN D multi-processor architecture . This dual-bus backplane enables up to 8 CPU modules per system, facilitating distributed control and real-time synchronization.
Innovation Point 4: Zero-Maintenance and Extreme Environmental Adaptability
Because the 6DD1682-0BC4 has no fans or air intake vents, it can be mounted in completely sealed IP54 or IP65 enclosures . This makes it resistant to conductive dust, oil mist, salt spray, and corrosive gases that would destroy fan-cooled systems. The passive cooling design translates to an indefinite service life for the cooling system itself, drastically reducing maintenance costs .
Innovation Point 5: Industrial-Grade Construction
Weighing 8 kg with robust aluminum alloy construction, the 6DD1682-0BC4 offers high EMC immunity and vibration resistance, ensuring consistent performance in heavy manufacturing environments like steel, mining, and marine propulsion .
