Siemens 3RX9307-1AA00 AS-Interface Power Supply – SIRIUS 3RG9

Siemens 3RX9307-1AA00 — AS-Interface Segment Power Supply with Integrated Bus Decoupling

The Siemens 3RX9307-1AA00 is a dedicated AS-Interface (AS-i) segment power supply unit belonging to the SIRIUS 3RG9 product family. Its primary function within a control architecture is to convert a standard 24 VDC PELV supply into the AS-i bus voltage (nominally 30 VDC per IEC 62026-2), while simultaneously performing active bus decoupling — a function that is architecturally inseparable from reliable AS-i communication. Without a properly rated and decoupled power supply at the segment level, AS-i slave addressing, cyclic data exchange, and safety telegram integrity are all at risk of degradation under real plant conditions.

In the SIRIUS 3RG9 sensor and actuator ecosystem, the 3RX9307-1AA00 occupies the foundational layer of the AS-i network stack. It feeds the two-wire unshielded AS-i cable that simultaneously carries both power and data to all connected slaves — up to 31 standard slaves or 62 A/B slaves per segment. The integrated decoupling choke within the unit prevents the switching-mode power conversion stage from injecting high-frequency noise onto the AS-i data signal, which operates in the 167 kHz Manchester-encoded range. This is not a passive filter; it is an active impedance boundary that maintains signal integrity across the full segment load envelope.

For procurement engineers and system integrators working within Siemens-based automation architectures — whether on new panel builds or field replacements — the 3RX9307-1AA00 is a direct, specification-matched component with no firmware configuration requirements. It is available from siemensplc.com, stocked in Xiamen, China, and dispatched globally via express freight with full commercial documentation.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The internal architecture of the 3RX9307-1AA00 addresses two distinct engineering problems that are inherent to AS-i network physics: voltage regulation under variable slave load, and signal-domain isolation between the power conversion stage and the data communication layer.

Voltage Regulation Under Variable Load: An AS-i segment is not a static load. As slaves cycle through their power states — particularly inductive proximity sensors during switching transitions — the instantaneous current draw fluctuates. The 3RX9307-1AA00 maintains the AS-i bus voltage within the IEC 62026-2 window of 29.5–31.6 VDC across this dynamic load range. Voltage excursions outside this window cause slave undervoltage lockout or overvoltage protection trips, both of which manifest as communication faults at the AS-i master — often misdiagnosed as cable or slave failures during commissioning.

Integrated Bus Decoupling Choke: The decoupling choke is wound to present high impedance at the AS-i data signal frequency (167 kHz Manchester encoding) while passing the DC bus current with minimal resistive drop. This impedance boundary prevents the switching frequency of the internal DC-DC converter (typically in the 50–200 kHz range) from aliasing into the AS-i data band. Without this isolation, bit error rates on the AS-i segment increase under heavy load — a failure mode that is load-dependent and therefore intermittent, making root-cause analysis difficult without a protocol analyzer.

EMC Design Posture: The unit’s DIN rail metal chassis provides a low-impedance ground reference plane. Combined with the decoupling choke, this creates a two-stage EMC barrier: conducted emissions from the power stage are attenuated before reaching the AS-i cable, and externally coupled transients on the AS-i cable are blocked from propagating into the 24 VDC supply rail. This bidirectional isolation is particularly relevant in environments with variable-frequency drives (VFDs) or large contactors sharing the same panel, where common-mode noise injection is a documented source of AS-i communication instability.

Thermal Management: The operating range of -25 °C to +70 °C is achieved through component derating and convection-optimized PCB layout. No forced-air cooling is required within the rated ambient range, which simplifies panel thermal design and eliminates fan maintenance as a reliability variable.

System Integration Benefits

• Single-component segment power solution: The integrated decoupling choke eliminates the need for a separate external choke (e.g., 3RX9501-0BA00), reducing panel BOM count, wiring complexity, and DIN rail space consumption by one discrete component per segment.
• Direct compatibility with all SIRIUS 3RG9 AS-i slaves: Voltage and current specifications are matched to the full SIRIUS 3RG9 inductive, capacitive, and photoelectric sensor range — no compatibility verification required for standard slave types.
• AS-i Safety at Work (AS-i SAW) compatible: Safety slaves (e.g., 3RK1 series) operate on the same AS-i segment and draw power from the same supply. The 3RX9307-1AA00 supports mixed standard and safety slave topologies without modification.
• Deterministic segment voltage for real-time cycle integrity: Stable bus voltage ensures that the AS-i master’s 5 ms cycle time (standard mode) is not disrupted by slave power brownouts, preserving the deterministic timing that PLC scan cycles depend on for I/O consistency.
• Diagnostic transparency via master fault reporting: Because the 3RX9307-1AA00 maintains bus voltage within specification, any slave communication fault reported at the AS-i master (e.g., via CP 343-2 or CM AS-i Master ST diagnostic buffer) can be attributed to the slave or cable — not the power supply — simplifying fault isolation during maintenance.
• Multi-segment scalability: Each 3RX9307-1AA00 independently powers one AS-i segment. For systems requiring more than 31/62 slaves, additional units are deployed in parallel segments, each with its own decoupled supply — a clean, modular architecture that scales without cross-segment interference.
• No configuration or parameterization required: The unit is passive from a software perspective. It requires no STEP 7, TIA Portal, or GSD file configuration. Replacement in the field is a direct swap with no engineering workstation involvement.
• Wide temperature tolerance reduces enclosure engineering overhead: The -25 °C to +70 °C operating range accommodates both climate-controlled MCC rooms and near-process junction boxes without requiring additional thermal management measures, reducing enclosure specification effort and cost.

Quality Assurance & Global Logistics

Every Siemens 3RX9307-1AA00 unit supplied by siemensplc.com is sourced as a genuine OEM component manufactured in Germany under Siemens AG’s ISO 9001-certified production processes. Each unit is verified against Siemens’ holographic authenticity label, date code, and part number marking prior to dispatch. Counterfeit detection is performed as a standard pre-shipment step — not an optional service.

Units are stocked at our Xiamen, China facility and dispatched via DHL Express, FedEx International Priority, or UPS Worldwide, with typical transit times of 3–7 business days to major industrial hubs in Europe, Southeast Asia, the Middle East, and the Americas. Full commercial documentation is provided with every shipment: commercial invoice, packing list, certificate of origin (COO), and — upon request — Siemens batch traceability documentation and test reports.

Our 12-month supply warranty covers dead-on-arrival (DOA) units and transit damage. Warranty claims are processed within 5 business days of receipt of the returned unit. For time-critical plant maintenance scenarios, advance replacement units can be dispatched upon agreement.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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