Siemens 3RX9501-0BA00 AS-Interface Power Supply

Product Details

3RX9501-0BA00 Product Description

The Siemens 3RX9501-0BA00 AS-i power supply is engineered as a foundational power-layer component within the AS-Interface (AS-i) fieldbus architecture — a two-wire system that simultaneously carries power and data to field devices across the automation network. In a complete industrial control architecture, this unit works in close coordination with the Siemens 3RK1405-0CE00-0AA2 AS-i master module, which manages network polling and slave addressing, and the 3RX9 series AS-i data decoupling modules that isolate power segments for redundant or extended network topologies.

At the control layer, the 3RX9501-0BA00 integrates seamlessly with SIMATIC S7-300 and S7-1200 PLCs via the AS-i master gateway, enabling the CPU to monitor network health, slave status, and power diagnostics without additional wiring overhead. The power supply's regulated 29.5–31.6 V DC output ensures stable signal transmission across the AS-i cable, supporting up to 31 standard slaves or 62 A/B slaves per network segment — a critical parameter for large-scale distributed I/O deployments.

For I/O layer integration, the 3RX9501-0BA00 powers Siemens 3RG9 AS-i sensor/actuator modules and 3RK1 compact starters directly on the AS-i cable, eliminating the need for separate 24 V DC power rails to field devices. This architecture reduces cabinet wiring complexity and supports modular expansion — additional slaves such as 3RX9 AS-i repeaters can extend network reach beyond the standard 100-meter segment limit without compromising power delivery or data integrity.

At the communication layer, the power supply's compliance with IEC 62026-2 ensures interoperability with third-party AS-i masters and gateways, including Siemens 3RK7 AS-i/PROFIBUS gateways and 3RK7 AS-i/PROFINET gateways, enabling seamless upward integration into PROFIBUS DP or PROFINET IO backbones. This makes the 3RX9501-0BA00 a natural fit for hybrid architectures where AS-i handles the sensor/actuator layer while PROFINET manages the controller-to-controller communication tier.

For redundancy and protection design, the unit's built-in short-circuit and overload protection safeguards the entire AS-i segment, complementing Siemens 3NW7 fuse holders and 5SD7 surge protection devices installed at the cabinet entry point. In safety-critical applications, the 3RX9501-0BA00 can be paired with Siemens 3RK3 AS-i Safety Monitor modules to form a complete AS-i Safety at Work (ASIsafe) architecture, meeting SIL 2 / PLd requirements without additional safety relays.

HMI and diagnostic integration is supported through the AS-i master's diagnostic data, which is surfaced on SIMATIC HMI TP700 or KTP900 panels via the SIMATIC S7 CPU. Engineers can monitor individual slave status, network voltage levels, and fault codes in real time — reducing mean time to repair (MTTR) and supporting predictive maintenance workflows. The 3RX9501-0BA00's LED status indicators provide local diagnostics for commissioning and field troubleshooting without requiring a laptop or programming tool.

Manufacturing & Assembly Lines: In automotive body shop and general assembly applications, the 3RX9501-0BA00 powers AS-i sensor networks monitoring conveyor position, part presence, and gripper status. Its DIN rail form factor fits standard control cabinets alongside SIMATIC S7 CPUs and ET 200SP distributed I/O, enabling compact, high-density panel designs for multi-station production lines.

Power & Energy Distribution: In medium-voltage switchgear and power distribution panels, the 3RX9501-0BA00 supports AS-i-based position feedback from motorized disconnectors and earthing switches. Its wide AC input range (100–240 V) accommodates both 110 V and 230 V auxiliary supply standards found in substation control rooms, ensuring compatibility across global project specifications.

Petrochemical & Process Industries: In hazardous area applications, the 3RX9501-0BA00 feeds AS-i segments connected to intrinsically safe barriers and Ex-rated field devices. When combined with Siemens 3RK3 AS-i Safety Monitor modules, the architecture supports zone 1/2 and zone 21/22 installations, meeting ATEX and IECEx requirements for process safety instrumented systems.

Water & Wastewater Treatment: Pump station and filtration plant control systems benefit from the 3RX9501-0BA00's robust power delivery to AS-i-connected level sensors, flow transmitters, and valve actuators. The AS-i network's inherent fault tolerance — slaves continue operating even if adjacent slaves fail — ensures continuous process monitoring during partial network faults.

Mining & Metals: In conveyor drive control and ore processing applications, the 3RX9501-0BA00 supports AS-i networks operating in high-vibration, high-dust environments. Its IP20 enclosure is designed for cabinet installation, while the connected AS-i field devices can carry IP67 or IP69K ratings, providing the environmental protection required for harsh mining environments.

Packaging & Material Handling: High-speed packaging lines use AS-i networks to coordinate sensor feedback from photoelectric sensors, inductive proximity switches, and pneumatic valve islands. The 3RX9501-0BA00's fast response time and stable output voltage ensure deterministic cycle times compatible with servo drive synchronization via Siemens SINAMICS G120 drives integrated at the execution layer.

Q1: How many AS-i slaves can the 3RX9501-0BA00 support on a single network segment? The 3RX9501-0BA00 provides sufficient power for up to 31 standard AS-i slaves or 62 A/B slaves per network segment, in compliance with the AS-Interface specification (IEC 62026-2). For larger installations requiring more slaves or longer cable runs, Siemens 3RX9 AS-i repeaters can extend the network while the 3RX9501-0BA00 continues to serve as the primary power source for the first segment. Each repeater introduces a new power segment, and an additional 3RX9501-0BA00 unit is recommended per extended segment to maintain voltage stability and current headroom.

Q2: Is the 3RX9501-0BA00 compatible with AS-i Safety at Work (ASIsafe) architectures? Yes. The 3RX9501-0BA00 is fully compatible with ASIsafe architectures when used in conjunction with Siemens 3RK3 AS-i Safety Monitor modules and AS-i-certified safety slaves (e.g., emergency stop buttons, safety light curtain interfaces). The power supply itself is a standard AS-i power component; safety functionality is implemented at the master and monitor level. This combination supports SIL 2 (IEC 62061) and PLd (ISO 13849-1) safety integrity levels, making it suitable for machine guarding and process safety applications. Contextual Integration with the broader Siemens safety ecosystem — including SIRIUS safety relays and SIMATIC Safety CPUs — is fully supported.

Q3: What are the stocking, lead time, and warranty terms for the 3RX9501-0BA00? NANKMOS maintains ready stock of the Siemens 3RX9501-0BA00 to support urgent project timelines and MRO (maintenance, repair, and operations) requirements. All units are sourced through verified supply channels, inspected prior to dispatch, and covered by a 12-Month Warranty against manufacturing defects and functional failures. Standard lead time for in-stock units is 3–7 business days for international shipments. For project quantities or scheduled delivery programs, contact our technical sales team to discuss allocation and logistics planning.