Siemens 3RX9307-1AA00 AS-Interface Power Supply Unit

Product Details

3RX9307-1AA00 Product Description

The Siemens 3RX9307-1AA00 is a dedicated AS-Interface (AS-i) power supply unit engineered for the SIRIUS control and safety system family, delivering stable, conditioned 30 V DC power across the AS-i network bus. In modern smart factory environments, reliable bus power is not a peripheral concern — it is the backbone of every data transaction between field devices and upper-level control systems. The 3RX9307-1AA00 ensures that AS-i slaves, sensors, actuators, and communication nodes receive consistent, noise-filtered power, enabling uninterrupted protocol communication across the entire AS-i segment. Designed and manufactured in Germany to Siemens SIRIUS quality standards, this unit ships fully tested and is backed by a 12-Month Warranty.

In a fully connected smart factory, the 3RX9307-1AA00 sits at the foundation of the AS-i data chain. Field-level devices — including SIRIUS 3SK safety relays, AS-i-compatible proximity sensors, photoelectric sensors, and pushbutton modules — draw both operating power and transmit their digital status signals over the same two-wire AS-i cable. The 3RX9307-1AA00 decouples the 30 V DC bus power from the data signal, ensuring that voltage fluctuations on the supply side do not corrupt the AS-i communication frame.

Upstream, an AS-i Master module — such as the Siemens CM AS-i Master ST (3RK7136 series) integrated into a SIMATIC S7-1200 or S7-1500 PLC — polls each AS-i slave cyclically, collecting I/O status at update rates typically below 5 ms per cycle. This real-time data is passed via PROFINET or PROFIBUS to the plant SCADA layer, where Siemens WinCC or a third-party HMI panel visualizes machine states, alarm conditions, and production KPIs. The 3RX9307-1AA00 ensures that this entire chain — from the sensor at the machine to the operator screen in the control room — remains electrically stable and data-coherent.

For multi-segment installations, the 3RX9307-1AA00 can be deployed in parallel with Siemens AS-i Repeater modules (3RK1400 series) to extend network reach beyond the standard 100-meter AS-i segment limit, supporting larger plant layouts without sacrificing cycle time or data integrity. In safety-critical zones, it powers AS-i Safety at Work (AS-i SaW) slaves, enabling SIL 2 / PLd safety functions — such as emergency stop, light curtain monitoring, and door interlock — to coexist on the same AS-i cable as standard I/O, reducing wiring complexity significantly.

At the edge, Siemens AS-i/PROFIBUS or AS-i/PROFINET gateways (3RK1904 series) aggregate AS-i slave data and forward it to higher-level networks, where edge computing platforms or industrial IoT gateways can perform local analytics, anomaly detection, and predictive maintenance calculations before forwarding summarized data to cloud SCADA or MES systems. Variable frequency drives (VFDs) with AS-i option boards can also be integrated into the same segment, allowing the PLC to read drive status, fault codes, and speed feedback over AS-i — all powered and stabilized by the 3RX9307-1AA00. Industrial Ethernet switches at the PROFINET layer then distribute this aggregated data to remote diagnostic workstations, enabling engineers to monitor the entire AS-i field network from a central location without physical access to the panel.

Many automation sites face persistent challenges: protocol fragmentation between legacy field devices and modern PLC platforms, data islands where sensor states are visible locally but not accessible to SCADA, and unreliable bus power that causes intermittent communication faults. The 3RX9307-1AA00 directly addresses these issues by providing a clean, regulated 30 V DC AS-i bus supply that eliminates voltage sag-induced communication errors — one of the most common root causes of spurious AS-i slave dropouts and diagnostic alarms.

By stabilizing the AS-i power rail, the 3RX9307-1AA00 enables the AS-i Master to maintain continuous, uninterrupted polling of all connected slaves, ensuring that alarm states — such as a tripped safety relay or a sensor fault — are captured and forwarded to the SCADA alarm management system in real time. This closes the gap between field event and operator awareness, reducing mean time to respond (MTTR) and improving overall equipment effectiveness (OEE). For sites undergoing digital transformation, the 3RX9307-1AA00 provides the stable network foundation required to add new AS-i slaves — additional sensors, actuators, or I/O modules — without redesigning the power architecture, supporting incremental system expansion aligned with smart factory roadmaps.

Q1: Does the 3RX9307-1AA00 support both standard AS-i and AS-i Safety at Work (SaW) slaves on the same segment? Yes. The 3RX9307-1AA00 provides the 30 V DC bus power required by both standard AS-i slaves and AS-i SaW safety slaves. The safety protocol logic is handled by the AS-i Safety Monitor or the AS-i Master with integrated safety functions; the power supply unit itself is protocol-agnostic at the slave level, making it compatible with mixed standard and safety AS-i networks.

Q2: What is the maximum AS-i segment length supported, and can the network be extended? The standard AS-i segment length is up to 100 meters using unshielded two-wire cable. With Siemens AS-i Repeater modules (3RK1400 series), the network can be extended to up to 300 meters (three segments), maintaining full data integrity and cycle time performance. The 3RX9307-1AA00 powers each segment independently when used in multi-segment configurations.

Q3: How does a stable AS-i power supply improve remote diagnostic capability? AS-i communication errors caused by bus voltage instability generate false slave fault alarms that mask genuine device faults in SCADA and HMI diagnostic screens. By maintaining a stable 30 V DC bus, the 3RX9307-1AA00 ensures that only genuine device faults are reported, improving the signal-to-noise ratio of remote diagnostic data and enabling maintenance teams to act on real fault conditions rather than chasing power-related communication artifacts.

Q4: What warranty and pre-shipment testing does the 3RX9307-1AA00 include? Every 3RX9307-1AA00 unit supplied by NANKMOS is covered by a 12-Month Warranty and undergoes functional testing before shipment to verify output voltage, bus decoupling performance, and electrical safety compliance. In-stock units are available for immediate dispatch, supporting urgent maintenance and production continuity requirements.