Siemens 6ES7307-1KA01-0AA0 PS 307 10A S7-300 Power Supply

Overview

Siemens 6ES7307-1KA01-0AA0 PS 307 10A S7-300 Power Supply: Migration-Ready Replacement for Legacy Control Systems

The Siemens 6ES7307-1KA01-0AA0 is a 24 VDC / 10 A regulated power supply module from the SIMATIC S7-300 series, designed to deliver stable DC power to the S7-300 CPU rack and connected I/O modules. As SIMATIC S7-300 systems approach end-of-life and spare part availability tightens, the 6ES7307-1KA01-0AA0 has become a critical component in retrofit planning, legacy system maintenance, and controlled migration projects across manufacturing, energy, petrochemical, and infrastructure sectors.

This module is a direct drop-in replacement for earlier PS 307 variants including the 6ES7307-1KA00-0AA0, sharing the same DIN rail mounting footprint, terminal block layout, and backplane connector interface. Engineers managing aging SIMATIC S7-300 control cabinets can install this unit without modifying existing wiring harnesses, terminal assignments, or cabinet cutouts — a key advantage when minimizing downtime during planned maintenance windows.

Before committing to a replacement, field engineers should verify the incoming AC supply voltage range (85–264 VAC wide-range input), confirm that the existing cable cross-sections are rated for the 10 A DC output, and check that the total current draw of all connected modules — including the CPU 315-2 DP or CPU 317-2 PN/DP, SM 321 digital input modules, SM 322 digital output modules, and any CP 343-1 Ethernet communication processors — does not exceed the 10 A rated output. Where total rack current demand approaches or exceeds this threshold, a parallel PS 307 5A (6ES7307-1EA01-0AA0) may be added to a secondary rack to distribute the load.

For sites migrating from older S7-300 configurations to newer SIMATIC S7-1500 platforms, the 6ES7307-1KA01-0AA0 often serves as an interim power solution during phased migration. During this transition period, the existing S7-300 rack continues to operate while new S7-1500 racks are commissioned in parallel. The PS 307 10A maintains power continuity to legacy I/O and field devices, allowing engineers to migrate program logic incrementally using STEP 7 to TIA Portal conversion tools without forcing a full cutover shutdown.

All units supplied by KNMKS are tested prior to shipment, verified against Siemens factory specifications, and covered by a support terms confirmed by quotation. Stock is maintained for immediate dispatch to support urgent breakdown replacements and planned retrofit schedules alike.

Migration Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful retrofit of the 6ES7307-1KA01-0AA0 begins with a full current audit of the target S7-300 rack. Engineers should document the power consumption of every installed module: the CPU (such as a CPU 314C-2 DP or CPU 315-2 PN/DP), all SM 321 / SM 322 / SM 331 / SM 332 signal modules, any FM 350 or FM 355 function modules, and communication processors such as the CP 343-1 Advanced. The sum of all module currents must remain within the 10 A output rating of the PS 307 10A.

Where the existing cabinet also houses an IM 360 / IM 361 expansion rack interface, engineers must account for the current drawn by expansion racks connected via the IM 365 interface module. In multi-rack configurations, each expansion rack requires its own dedicated PS 307 power supply — the 6ES7307-1KA01-0AA0 is suitable for expansion racks with high I/O density, while the PS 307 5A (6ES7307-1EA01-0AA0) may suffice for lighter expansion racks.

Terminal block wiring should be inspected and re-torqued during replacement. The L+, M, and PE terminals must be verified against the original wiring diagram. Where cable ferrules are absent, installation of insulated ferrules is recommended to prevent strand fraying under vibration — a common issue in motor control centers and compressor control panels operating in petrochemical environments.

For sites where the S7-300 rack communicates with a WinCC or WinCC flexible HMI panel via MPI or PROFIBUS DP, the power supply replacement does not affect the communication link. However, engineers should confirm that the MPI address assignments and PROFIBUS DP station addresses are documented before powering down, as some older CPU firmware versions may require a warm restart to re-establish communication after a power cycle. Where PROFINET is in use via a CP 343-1 Lean or CP 343-1 Advanced, IP address assignments should be noted and verified post-restart.

Downtime Control During System Migration

Replacing the 6ES7307-1KA01-0AA0 in a live production environment requires careful pre-planning to minimize process interruption. The recommended approach is to schedule the replacement during a planned maintenance window, coordinate with the process control team to place the affected control loop in manual mode, and prepare a pre-tested replacement unit before the shutdown begins.

Prior to powering down the rack, engineers should perform a full CPU memory backup using STEP 7 or TIA Portal, saving the current program blocks (OB, FB, FC, DB) and hardware configuration to an offline project file. This ensures that if the CPU loses its retentive memory during the power interruption, the program can be reloaded within minutes. Where a Siemens SIMATIC Micro Memory Card (MMC) is installed in the CPU, the program is retained without battery backup, significantly reducing recovery time risk.

The physical replacement procedure typically takes 15–20 minutes: isolate the incoming AC supply to the PS 307, disconnect the L1, N, and PE terminals, remove the module from the DIN rail, install the 6ES7307-1KA01-0AA0, reconnect terminals, restore AC supply, and verify 24 VDC output with a calibrated multimeter before reconnecting the backplane bus connector. Total controlled downtime — including pre-checks, replacement, and post-restart verification — is typically achievable within 30–45 minutes for experienced field engineers.

Where zero-downtime replacement is required, a redundant power supply arrangement using two PS 307 10A units in a diode-ORed configuration (with an external diode module) can maintain continuous 24 VDC supply to the rack during hot-swap of one unit. This approach is common in critical infrastructure and continuous process applications where even brief power interruptions are unacceptable.

Retrofit Support FAQ

Q1: Is the 6ES7307-1KA01-0AA0 a direct replacement for the 6ES7307-1KA00-0AA0?
Yes. The -1KA01- revision is the current production successor to the -1KA00- variant. Both share the same mechanical footprint, terminal layout, output ratings, and S7-300 backplane interface. No wiring modifications or hardware configuration changes are required. The wide-range AC input on the -1KA01- eliminates the need to manually set a voltage selector switch present on some earlier units.

Q2: Does KNMKS test units before shipment?
Yes. All 6ES7307-1KA01-0AA0 units are powered on and output voltage is verified against Siemens specifications (24 VDC ±1%) before dispatch. Units are packaged in anti-static protective packaging with inspection documentation included. A support terms confirmed by quotation is provided from the date of shipment, covering manufacturing defects and functional failures under normal operating conditions.

Q3: What should I check during commissioning after installation?
After installing the replacement PS 307 10A, verify: (1) output voltage at the L+ and M terminals reads 24 VDC ±1% under load; (2) the CPU RUN/STOP LED returns to RUN state after power-on; (3) all I/O module status LEDs indicate normal operation; (4) PROFIBUS DP or PROFINET communication links re-establish within the expected timeout period; (5) HMI panels reconnect and display current process values. If the CPU enters STOP mode after restart, check for hardware configuration mismatches using STEP 7 online diagnostics.

Q4: What is the stock availability and lead time?
KNMKS maintains inventory of the 6ES7307-1KA01-0AA0 for immediate dispatch. Standard orders are processed and shipped within 1–2 business days. For urgent breakdown replacements, expedited shipping options are available. Contact our sales team at [email protected] or +86 18359268345 to confirm current stock levels and delivery timelines for your location.

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6ES7307-1KA01-0AA0
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