Siemens 6ES7307-1EA01-0AA0 Power Supply Module – PS-307

Siemens 6ES7307-1EA01-0AA0 PS-307 5A: Regulated 24 VDC Backbone of the SIMATIC S7-300 Control Architecture

The 6ES7307-1EA01-0AA0 is the current production revision of the PS-307 5A power supply module within the SIMATIC S7-300 family. Its singular function is to convert wide-range AC mains (120 V or 230 V, 47–63 Hz) into a tightly regulated 24 V DC / 5 A rail that feeds both the S7-300 backplane bus and the 24 V load circuits of connected I/O modules. Unlike generic DIN-rail PSUs, this module integrates directly with the S7-300 rack mechanical and electrical interface: the backplane connector on its right-hand face mates with the rack bus segment, eliminating any external wiring between the power supply and the CPU or signal modules. This architecture removes a potential failure point and ensures that the 5 V logic supply derived internally by each module is sourced from a single, factory-calibrated reference.

In a fully populated eight-slot S7-300 rack carrying a mid-range CPU (e.g., CPU 314C-2 DP) alongside digital and analog I/O modules, the aggregate 24 V current demand typically falls between 2.8 A and 4.3 A depending on module mix and field-device loading. The 5 A continuous rating of the 6ES7307-1EA01-0AA0 provides a working headroom of 15–40%, which is consistent with Siemens’ own hardware configuration guidelines for thermal derating at ambient temperatures above 40 °C. Engineers specifying this module for installations in southern climates or non-air-conditioned enclosures should verify the power budget using the TIA Portal hardware catalog or STEP 7 HW Config tool before commissioning.

The -1EA01 revision supersedes the earlier -1EA00 variant. The principal change is an upgraded electrolytic capacitor specification on the output filter stage, selected for extended capacitance retention at elevated junction temperatures. Field data from Siemens service bulletins indicates that this change extends the expected service interval in 55 °C ambient environments by approximately 30% compared to the -1EA00 build. The module is a direct mechanical and electrical drop-in replacement: no firmware update, no hardware configuration change, and no re-parameterization in STEP 7 or TIA Portal is required.

The 6ES7307-1EA01-0AA0 is deployed across a wide spectrum of industrial sectors. In automotive body-in-white lines, it powers S7-300 racks controlling resistance spot-welding guns and transfer conveyors where supply interruptions directly impact cycle time. In water and wastewater treatment, it energizes SCADA-connected PLCs in pump-station MCC cabinets where the wide-range AC input accommodates generator-backed supplies with variable frequency. In food and beverage processing, its compact 50 mm width preserves panel space in hygienic-design enclosures where every millimeter of DIN-rail real estate is contested. In building automation, it drives S7-300 controllers integrated into BMS networks via PROFIBUS DP or Industrial Ethernet, where the stable 24 V rail is shared between the PLC rack and field-bus repeaters.

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Technical Parameters

Hardware Logical Analysis

The internal topology of the 6ES7307-1EA01-0AA0 is a single-stage flyback converter with synchronous rectification on the secondary side. The primary switching frequency operates in the range of 60–100 kHz, which places the dominant conducted-emission components well above the CISPR 11 Class A limit band when the integrated common-mode choke and X/Y capacitor network are correctly terminated. The output filter uses a two-stage LC network: the first stage handles high-frequency ripple suppression (≥ 40 dB attenuation above 100 kHz), and the second stage provides bulk capacitance for transient load steps. The -1EA01 revision replaces the second-stage bulk capacitors with 105 °C-rated, low-ESR types, reducing the output impedance at 1 kHz by approximately 18% compared to the -1EA00 build — a measurable improvement in voltage stability during fast load transitions caused by simultaneous switching of multiple digital output modules.

EMC performance is addressed at three levels. First, the input stage incorporates a differential-mode filter choke and a common-mode choke in series, attenuating both symmetric and asymmetric conducted interference back onto the AC supply. Second, the transformer primary-to-secondary screen winding provides a low-impedance path for displacement currents, preventing high-frequency noise from coupling into the 24 V output rail. Third, the module housing is a grounded metal enclosure bonded to the S7-300 rack ground rail via the DIN-rail mounting clip, providing a continuous shielding path that satisfies the EN 61000-4-3 radiated immunity requirement at 10 V/m without additional external shielding.

The output voltage sense point is located at the backplane connector rather than at the output terminals, which means the regulation loop compensates for the voltage drop across the internal bus bar between the output capacitor bank and the rack connector. This design choice ensures that the 24 V presented to the CPU and I/O modules remains within the ±1% tolerance band even when the output current varies between 0.5 A (light load) and 5 A (full load), a condition that would produce a 200–300 mV drop across a typical 40 mΩ bus bar if remote sensing were not implemented.

System Integration Benefits

• Direct backplane bus integration: The right-side connector mates mechanically and electrically with the S7-300 rack bus segment, eliminating external 24 V wiring between the PSU and the CPU. This removes a wiring error risk and reduces panel assembly time by an estimated 15–20 minutes per rack.
• Single-SKU global voltage compatibility: The auto-switching 120/230 V AC input allows the same module to be installed in North American (120 V, 60 Hz) and European or Asian (230 V, 50 Hz) facilities without hardware modification, simplifying spare-parts inventory for multinational machine builders.
• Deterministic fault recovery: The electronic auto-restart mechanism re-applies output voltage within 500 ms of fault clearance without operator intervention, reducing unplanned downtime in unmanned or remote installations where manual PSU reset would require a site visit.
• Power budget transparency via TIA Portal: The module’s electrical parameters are embedded in the TIA Portal hardware catalog, enabling the hardware configuration tool to calculate the rack power budget automatically and flag overload conditions at the engineering stage rather than at commissioning.
• Stable 24 V reference for analog I/O accuracy: Analog input modules such as the SM 331 derive their reference voltage from the 24 V supply rail. The ±1% output tolerance of the 6ES7307-1EA01-0AA0 contributes less than 0.25 LSB of reference error to a 12-bit ADC, preserving measurement accuracy without requiring an external precision reference.
• Thermal headroom for high-ambient installations: The 85% efficiency rating means that at full 120 W output, internal dissipation is approximately 21 W. The convection-cooled aluminum heatsink maintains junction temperatures within safe limits up to 60 °C ambient, covering the majority of industrial enclosure environments without forced-air cooling.
• Diagnostic LED for rapid fault localization: The front-panel DC 24V green LED provides a binary indication of output status. In multi-rack systems, this allows maintenance personnel to identify a failed PSU visually within seconds, without connecting a laptop or interrogating the CPU via STEP 7 or TIA Portal.
• Drop-in replacement for -1EA00 revision: No changes to the STEP 7 or TIA Portal hardware configuration are required when substituting the -1EA01 for the -1EA00. The module occupies the same physical slot, uses the same backplane connector, and presents identical electrical characteristics to the CPU and I/O modules, eliminating re-commissioning risk during emergency replacement.

Quality Assurance & Global Logistics

Every 6ES7307-1EA01-0AA0 unit dispatched from our Xiamen, China facility is sourced from verified supply channels and passes a structured incoming-inspection protocol before entering stock. Inspection steps include visual examination of housing, label, and connector integrity; output voltage measurement under rated 5 A load (acceptance criterion: 24 V DC ± 0.5%); functional power-on test against an S7-300 backplane simulator confirming bus communication; and serial-number cross-reference against Siemens’ product traceability records where applicable. Units are stored in ESD-safe, climate-controlled conditions and dispatched in original or equivalent anti-static packaging with foam corner protection.

Logistics from Xiamen covers all major global destinations. Standard air-freight transit times are 3–5 business days to Europe, 4–6 business days to North America, and 2–3 business days to Southeast Asia. Express courier options (DHL, FedEx, UPS) are available for urgent requirements with same-day dispatch on in-stock units confirmed before 14:00 CST. All shipments include a commercial invoice, packing list, and certificate of conformance. Import documentation support (HS code 8537.10, country of origin declaration) is provided on request. A 12-month warranty covers manufacturing defects; units exhibiting failure within the warranty period are replaced or credited without charge after fault confirmation.

Contact Information

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