Technical Specifications

Main Features and Advantages

The Siemens 6DD2920-0AC0​ delivers extraordinary value to plant operators and system integrators by providing galvanically isolated, noise-immune optical signal transmission within Siemens’ proven SIMADYN D control system architecture. Its defining characteristic is the ability to transform high-speed electrical signals from the SIMADYN D backplane into light pulses transmitted over fiber optic cable—a capability that completely eliminates the vulnerability to electromagnetic interference (EMI) that plagues conventional copper signal wiring. In environments where thousands of amperes switch dynamically and variable frequency drives generate intense high-frequency noise, the Siemens 6DD2920-0AC0​ ensures that critical control signals arrive at their destination uncorrupted, maintaining the precision and determinism that SIMADYN D systems are renowned for.Complete Galvanic Isolation: The Siemens 6DD2920-0AC0​ achieves total electrical isolation between the SIMADYN D rack and remote field devices through fiber optic transmission. This optical isolation eliminates ground loops, prevents high-voltage transients from propagating into sensitive control electronics, and provides intrinsic safety in hazardous environments. For plant operators, the Siemens 6DD2920-0AC0​ represents an insurance policy against the catastrophic failures that can result from electrical noise coupling into control signals—failures that in heavy industry can trigger unplanned downtime costing hundreds of thousands of dollars per hour.Noise-Immune Signal Integrity: By converting electrical signals to light, the Siemens 6DD2920-0AC0​ delivers bit-perfect data transmission even in the most electrically hostile environments—steel rolling mills, excitation systems, large converter stations, and high-power test facilities. The module’s optical transmission path is completely immune to electromagnetic induction, capacitive coupling, and radio frequency interference, ensuring that the Siemens 6DD2920-0AC0​ maintains signal fidelity across distances far exceeding the practical limits of copper wiring. This noise immunity is particularly valuable in SIMADYN D applications where microsecond-level timing accuracy is essential for multi-drive synchronization.Seamless SIMADYN D Backplane Integration: As a native module of the SIMADYN D rack, the Siemens 6DD2920-0AC0​ interfaces directly with the system’s dual 16-bit backplane buses, receiving signals from PM5/PM6 processor modules and other system components with deterministic, high-throughput performance. This deep architectural integration ensures that the Siemens 6DD2920-0AC0​ operates in perfect synchronization with the rest of the SIMADYN D rack, maintaining the sub-millisecond control loop performance that defines world-class industrial automation. The module slots into the SIMADYN D subrack without requiring external protocol converters or gateways.Complementary Pair Architecture: The Siemens 6DD2920-0AC0​ (ELE1 light transmitter) is designed to work in conjunction with the 6DD2920-0AD0 (ELR1 light receiver) module, forming a complete bidirectional or unidirectional fiber-optic communication link within SIMADYN D systems. This transmitter-receiver pairing enables the Siemens 6DD2920-0AC0​ to establish noise-immune communication channels between SIMADYN D racks, between a SIMADYN D rack and remote I/O, or between SIMADYN D and peer control systems. The complementary architecture simplifies system design while delivering uncompromising signal integrity.Industrial-Grade Robustness: Engineered for the harshest industrial environments, the Siemens 6DD2920-0AC0​ operates reliably across a wide temperature range of -25°C to +55°C, withstanding the thermal variations, vibrations, and electrical stresses characteristic of heavy industrial installations. Its 0.685 kg robust construction and IP20 protection rating (when installed in a control cabinet) ensure long-term durability, while the German-manufactured PCB and optical components deliver the quality and reliability that have made Siemens SIMADYN D a legend in industrial automation.Critical Spare Part for Legacy Systems: As Siemens has transitioned SIMADYN D into obsolescence (platform discontinued October 1, 2015), the Siemens 6DD2920-0AC0​ has become an irreplaceable spare part for the thousands of SIMADYN D systems still operating worldwide. Its unique optical transmission functionality cannot be substituted by generic interface modules—only the authentic Siemens 6DD2920-0AC0​ can preserve the original system’s noise immunity and signal fidelity. For plant operators running SIMADYN D-based mission-critical systems, maintaining strategic spare inventory of the Siemens 6DD2920-0AC0​ is essential for business continuity.