Siemens A5E00136572 PLC Power Supply Module – SIMATIC S7-300

Siemens A5E00136572 — 24 VDC Rack Power Supply for SIMATIC S7-300 Control Systems

The A5E00136572 is a dedicated DC power supply module engineered for the SIMATIC S7-300 rack architecture. Its primary function within a control loop is to convert wide-range AC mains input into a tightly regulated 24 VDC bus that feeds the CPU backplane, all installed I/O modules, and field sensor loads simultaneously. Without a stable, low-ripple DC rail, the deterministic scan cycle of an S7-300 CPU cannot be maintained — voltage transients as small as ±5% on the internal bus can trigger watchdog resets or corrupt process image data. The A5E00136572 addresses this by incorporating active output regulation with fast transient response, ensuring the backplane voltage remains within specification even during sudden load steps caused by simultaneous digital output switching.

In process-industry deployments — reactor loop control, distillation column sequencing, batch dosing — the module operates continuously at elevated ambient temperatures. Its thermal design accounts for convective airflow within standard 19-inch control cabinets, maintaining junction temperatures within safe limits at full rated load across the 0 °C to +60 °C operating range. For discrete manufacturing cells such as robotic welding stations and servo-driven press lines, the module’s wide-range AC input (120 VAC / 230 VAC auto-select) eliminates the need for external voltage selection switches, reducing panel wiring errors during global machine deployment.

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Technical Parameters

Hardware Logical Analysis

The A5E00136572 employs a switched-mode power conversion topology rather than a linear regulator, which yields two measurable advantages in industrial panel environments: higher conversion efficiency (reducing heat dissipation inside sealed enclosures) and inherent galvanic isolation between the AC mains input and the 24 VDC output rail. This isolation barrier — typically implemented via a high-frequency transformer operating in the 50–200 kHz range — provides common-mode noise rejection exceeding 60 dB, which is critical in environments where variable-frequency drives, contactors, and inductive loads generate conducted EMI on the same AC distribution network.

The output stage incorporates an LC filter network that attenuates switching ripple to levels compatible with the SIMATIC S7-300 backplane specification. The module’s output capacitance is sized to sustain the 24 VDC rail during brief AC input interruptions (hold-up time), preventing nuisance CPU resets during momentary mains dips — a common failure mode in facilities with large motor starters on shared distribution panels.

Overcurrent protection is implemented via a current-limiting fold-back circuit rather than a simple fuse. Under a short-circuit condition on the 24 VDC output, the module reduces output current to a safe level and attempts periodic restart, protecting both the power supply and the connected I/O modules from thermal damage. This behavior is preferable to a blown fuse in applications where unattended restart after fault clearance is required.

The module’s EMC design conforms to the SIMATIC S7-300 system EMC envelope, meaning it has been tested as part of the complete rack assembly for radiated and conducted emissions per EN 61000-6-4 (industrial emission) and immunity per EN 61000-6-2 (industrial immunity). Surge immunity testing per IEC 61000-4-5 at 1 kV (line-to-line) and 2 kV (line-to-earth) ensures the module survives lightning-induced transients on unprotected AC distribution lines.

System Integration Benefits

• Deterministic Scan Cycle Preservation: Tight output regulation (±1%) prevents the CPU’s internal voltage monitor from triggering a STOP transition during load transients, maintaining uninterrupted PLC scan execution in time-critical control loops.
• Zero-Modification Rack Replacement: The A5E00136572 occupies the designated PS slot on the S7-300 mounting rail with no adapter hardware, reducing mean time to repair (MTTR) during unplanned maintenance windows.
• Galvanic Isolation for Ground Loop Elimination: The AC-to-DC isolation barrier breaks ground loops between the control panel earth and field device commons, reducing analog signal noise floors in 4–20 mA measurement loops.
• Wide AC Input for Global Machine Deployment: Auto-ranging 120/230 VAC input eliminates manual voltage selection, reducing commissioning errors when identical machine designs are deployed across North American and European facilities.
• Fold-Back Overcurrent Protection: Protects downstream I/O modules and field wiring from sustained fault currents without requiring fuse replacement, enabling faster fault recovery in unmanned remote stations.
• Hold-Up Time Buffering: Output capacitance sustains the 24 VDC rail through brief AC mains interruptions, preventing CPU watchdog trips caused by momentary voltage dips from large motor starts on shared distribution panels.
• Thermal Margin at Rated Load: Designed for continuous full-load operation at +60 °C ambient, providing thermal headroom in sealed enclosures where internal temperatures exceed external ambient by 10–15 °C.
• TIA Portal Hardware Configuration Visibility: Power supply status is represented in the SIMATIC hardware catalog, allowing engineers to document the complete rack BOM within TIA Portal and STEP 7 projects for accurate spare parts management.
• RoHS and CE Compliance: Satisfies EU import requirements and hazardous substance restrictions, simplifying customs documentation for European end-user installations.
• Standardized Spare Parts Inventory: As a catalogued Siemens component, the A5E00136572 integrates into SAP PM and Maximo CMMS spare parts databases using the Siemens part number as the primary key, reducing procurement lead times for maintenance teams.

Quality Assurance & Global Logistics

Every A5E00136572 unit dispatched from our Xiamen, China facility is sourced through verified Siemens-authorized distribution channels. Each module undergoes a structured pre-shipment inspection protocol: visual examination of housing integrity, label authenticity verification against Siemens holographic security features, output voltage measurement under a representative load, and date-code cross-reference against known production batches. Units are packed in anti-static bags with desiccant and humidity indicator cards, then placed in double-wall corrugated cartons rated for international air freight handling.

Outbound logistics from Xiamen Gaoqi International Airport connect to DHL Express, FedEx International Priority, and UPS Worldwide Expedited networks, achieving typical transit times of 3–5 business days to Western Europe, 4–6 days to North America, and 2–3 days to Southeast Asia. Commercial invoice, packing list, and certificate of origin documentation are prepared to HS Code 8537.10 standards for smooth customs clearance. For orders requiring Siemens factory test certificates or material traceability documentation, these can be requested at the time of order placement.

A 12-month warranty covers all units against manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed with a target replacement dispatch of 5 business days from confirmed fault diagnosis.

Contact Information

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