SIEMENS 3ES7307-1EA01-0AA0 Migration-Ready PS307 5A Supply

Overview

SIEMENS 3ES7307-1EA01-0AA0 Migration-Ready PS307 5A Supply for Legacy S7-300 Control Systems

The SIEMENS 3ES7307-1EA01-0AA0 is a 5A rated DC power supply module from the PS307 series, purpose-built for SIMATIC S7-300 rack-based control systems. As legacy S7-300 installations approach end-of-life and original Siemens part numbers become increasingly difficult to source, the 3ES7307-1EA01-0AA0 serves as a verified migration-ready replacement that preserves existing rack geometry, terminal wiring, and backplane interface compatibility without requiring PLC program modification or HMI screen redesign.

This module delivers a regulated 24VDC output at up to 5A continuous load, accepting a wide-range AC input (120/230VAC, 50/60Hz). Its DIN-rail and S7-300 rack mounting footprint is mechanically identical to the original 6ES7307-1EA01-0AA0, making it a direct physical substitute in existing control cabinet layouts where installation space is constrained and panel re-engineering is not feasible. Each unit undergoes pre-shipment functional testing covering output voltage regulation, overload protection response, and thermal performance before dispatch.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

Successful integration of the 3ES7307-1EA01-0AA0 into an existing S7-300 control system requires a structured pre-replacement assessment. Begin by auditing the total connected load on the 24VDC bus: sum the current draw of all installed signal modules (SM321 digital input, SM322 digital output, SM331 analog input, SM332 analog output), the CPU module (CPU 314, CPU 315-2 DP, or CPU 317-2 PN/DP depending on the installed configuration), and any IM361 interface modules used for multi-rack expansion. The PS307 5A rating provides 120W of available DC power; if the aggregate load approaches or exceeds 4.5A, evaluate whether a PS307 10A (6ES7307-1KA02-0AA0) is more appropriate for the retrofit.

For multi-rack S7-300 configurations, the power supply in rack 0 feeds the CPU and local I/O, while expansion racks connected via IM360/IM361 interface modules carry their own PS307 units. Confirm that each expansion rack’s power budget is independently satisfied before finalizing the replacement scope. In installations where a CP343-1 PROFINET communication processor or a CP342-5 PROFIBUS-DP master is installed, verify that the communication module’s 24VDC supply current is included in the load calculation, as these modules draw additional current beyond the standard I/O budget.

Terminal block wiring on the 3ES7307-1EA01-0AA0 follows the standard PS307 layout: L1/N/PE for AC input and +24V/M/PE for DC output. In older cabinets where the original wiring was routed for the 6ES7307-1EA01-0AA0, no re-termination is required — existing cable lengths and lug types are compatible. If the installation includes a SITOP PSU100S or similar external 24VDC buffer module for ride-through during brief AC interruptions, confirm that the buffer module’s input current rating is compatible with the 5A output of this supply. For systems using a SIMATIC S7-300 programming cable (PC Adapter USB or MPI/DP adapter) for online diagnostics, the communication link remains fully operational during and after the power supply swap, as the MPI interface is CPU-resident and independent of the PS slot.

Downtime Control During System Migration

Minimizing unplanned downtime during a PS307 replacement requires preparation before the maintenance window opens. Prior to shutdown, use STEP 7 (Simatic Manager) or TIA Portal to perform an online upload of the current CPU program blocks — OB, FB, FC, DB, and SFC — to a backup project file. This ensures that if the CPU loses its retentive memory during the power cycle, the program can be reloaded within minutes rather than hours. For CPUs with a memory card (MMC or SD depending on the CPU generation), verify that the card contains a valid, current program image so that the CPU performs an automatic program restore on first power-up after the supply replacement.

During the physical swap, de-energize the AC input at the cabinet’s main isolator rather than at the PS307 terminals to ensure that all downstream 24VDC consumers — including field sensors, solenoid valve coils, and distributed I/O nodes on a PROFIBUS-DP or PROFINET network — are safely de-powered in a controlled sequence. After installing the 3ES7307-1EA01-0AA0, re-energize and monitor the DC output voltage at the PS307 terminals with a calibrated multimeter before reconnecting the backplane bus connector. Confirm 24.0–24.5VDC before allowing the CPU to boot. Once the CPU reaches RUN mode, verify that all I/O modules report correctly in the hardware configuration and that the PROFIBUS or PROFINET network status shows no faults in the diagnostic buffer (accessible via the CPU’s diagnostic buffer in STEP 7 or TIA Portal online view).

For production lines where even a brief interruption is critical, consider staging the replacement during a scheduled preventive maintenance window and pre-testing the 3ES7307-1EA01-0AA0 on a bench setup with a representative load before installation. Each unit shipped from our inventory has been pre-tested at rated load, reducing the risk of a DOA unit extending the maintenance window.

Retrofit Support FAQ

Q1: Is the 3ES7307-1EA01-0AA0 a direct replacement for the 6ES7307-1EA01-0AA0?
Yes. The 3ES7307-1EA01-0AA0 is mechanically and electrically equivalent to the 6ES7307-1EA01-0AA0. It fits the same PS slot in the S7-300 rack, uses the same terminal layout, and delivers the same 24VDC/5A output. No program changes, HMI reconfiguration, or hardware configuration updates in STEP 7 or TIA Portal are required.

Q2: What pre-shipment testing is performed on each unit?
Each 3ES7307-1EA01-0AA0 undergoes output voltage verification at no-load and full-load (5A), overload protection trip-point confirmation, and visual inspection for terminal and connector integrity before dispatch. A test record is available upon request. Units are shipped with protective packaging to prevent transit damage to terminals and front connectors.

Q3: What is the support terms coverage and how are claims handled?
All units carry a support terms confirmed by quotation from the date of shipment, covering manufacturing defects and functional failures under normal operating conditions. Support requests are processed via email to admin@knmks.com with the order reference and a description of the fault. Replacement units are dispatched upon fault confirmation; no return-to-base delay for straightforward cases.

Q4: Can you supply multiple units for a multi-rack S7-300 system or long-term spare parts inventory?
Yes. We maintain stock of the 3ES7307-1EA01-0AA0 for both immediate single-unit replacement and bulk spare parts procurement. For multi-rack systems requiring several PS307 units, or for customers building a long-term maintenance inventory for end-of-life S7-300 lines, please contact us for volume pricing and lead time confirmation. Long-term supply commitments are available for customers with ongoing retrofit programs.

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SIEMENS
Siemens

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3ES7307-1EA01-0AA0

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PLCs & Controllers

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Available on request after model and quantity confirmation

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PLC, PAC and modular controllers

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CPU, rack, power and I/O expansion

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Replacement, cabinet build and maintenance

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