Siemens 6ES7307-1BA00-0AA0 Replacement for SIMATIC S7-300

Product Overview

Siemens 6ES7307-1BA00-0AA0 Replacement/Upgrade Solution for SIMATIC S7-300: Smooth Transition, Zero Compromise

The Siemens 6ES7307-1BA00-0AA0 is the PS307 2A power supply module purpose-built for the SIMATIC S7-300 programmable logic controller platform. Rated at 24 V DC / 2 A output from a 120/230 V AC input, this module slots directly into the standard S7-300 DIN-rail mounting rail alongside the CPU rack, requiring no additional adapter hardware. As Siemens progressively transitions its installed base toward the ET 200SP and S7-1500 ecosystems, many facilities operating legacy S7-300 lines face an urgent need for reliable, specification-matched replacement units to sustain production continuity without committing to a full control-system overhaul.

TOPNLMS maintains verified stock of the 6ES7307-1BA00-0AA0 and ships globally from Xiamen, China, with full pre-shipment functional testing and a 12-month replacement warranty. Whether your plant is running a single S7-300 rack or a distributed multi-rack configuration tied together via PROFIBUS DP, this power supply is the lowest-risk, lowest-downtime path to restoring your system.

Compatibility Comparison Table

Seamless Upgrade Solutions

A power supply replacement rarely happens in isolation. In a typical S7-300 retrofit or emergency repair scenario, engineers simultaneously audit adjacent modules to prevent cascading failures. When replacing the 6ES7307-1BA00-0AA0, the following components are commonly evaluated or replaced in the same maintenance window:

The CPU 314C-2 DP (6ES7314-6CG03-0AB0) is the most common CPU found in mid-range S7-300 racks powered by the PS307 2A. If the CPU’s onboard PROFIBUS DP port is being retained for communication with remote I/O stations or drives, verifying the CPU’s firmware version and memory card integrity during the power supply swap is standard practice. Similarly, the SM 321 Digital Input Module (6ES7321-1BH02-0AA0) and SM 322 Digital Output Module (6ES7322-1BH01-0AA0) are the workhorses of most S7-300 I/O racks; their 24 V DC supply rail is fed directly from the PS307, making them the first modules to exhibit erratic behavior when the power supply degrades.

For systems using analog signals, the SM 331 Analog Input Module (6ES7331-7KF02-0AB0) requires a stable, low-ripple 24 V DC supply — a degraded PS307 is a common root cause of unexplained analog drift. Replacing the power supply alongside the SM 331 eliminates this variable entirely. In distributed architectures, the IM 360 / IM 361 Interface Modules that link expansion racks back to the central rack also draw from the PS307 rail; confirming their power budget is part of any responsible rack audit.

On the communication side, facilities running CP 342-5 PROFIBUS DP Communication Processors or CP 343-1 Industrial Ethernet modules should verify that the combined module current draw remains within the 2 A ceiling of the PS307 2A. If the load budget is tight, upgrading to the 6ES7307-1EA01-0AA0 PS307 5A variant is the recommended path — TOPNLMS stocks both ratings. For HMI connectivity, Siemens TP700 Comfort or KTP700 Basic panels connected via MPI or PROFIBUS DP are unaffected by the power supply swap, as they draw from a separate 24 V DC supply rail in the control cabinet.

Finally, engineers performing the physical swap should have a SIMATIC S7 PC Adapter USB (6ES7972-0CB20-0XA0) or MPI/PROFIBUS programming cable on hand to perform an online CPU status check immediately after power-up, confirming that all I/O modules are recognized and no hardware faults are logged in the diagnostic buffer.

Retrofit Guidance FAQ

Q: Can I replace the 6ES7307-1BA00-0AA0 without modifying the existing wiring?
A: Yes. The terminal layout (L1, N, PE on the AC input side; L+, M on the DC output side) is identical across all PS307 2A units. Disconnect power, remove the old module from the DIN rail, slide in the replacement, reconnect the terminals using the same wire positions, and restore power. No rewiring is required.

Q: Will the CPU retain its program after the power supply is swapped?
A: Yes. The S7-300 CPU stores its program on a SIMATIC Micro Memory Card (MMC). The program is non-volatile and is not affected by removing power from the rack. After the swap, the CPU will restart and load the program from the MMC automatically.

Q: Does this replacement affect PROFIBUS DP or MPI communication?
A: No. The PS307 is a power-only module with no communication function. PROFIBUS DP and MPI network parameters are stored in the CPU and are unaffected by the power supply replacement.

Q: What if my rack has more than 2 A of load?
A: Calculate the total current draw of all installed modules (CPU + I/O + communication modules) using the S7-300 hardware configuration tool in STEP 7 or TIA Portal. If the total exceeds 2 A, replace with the PS307 5A (6ES7307-1EA01-0AA0) instead. TOPNLMS can supply both variants.

Q: Is this module compatible with both 120 V and 230 V AC mains?
A: Yes. The 6ES7307-1BA00-0AA0 features automatic input voltage ranging (85–264 V AC), making it suitable for both North American and European/Asian mains without any manual tap or jumper change.

Q: How long does shipping take?
A: Standard international express shipping from Xiamen typically delivers within 3–7 business days to most destinations. Expedited options are available. Contact us at [email protected] for time-critical orders.

Warranty Assurance

Every 6ES7307-1BA00-0AA0 unit shipped by TOPNLMS undergoes a pre-shipment functional test verifying output voltage regulation, ripple, and thermal performance under load. Units are shipped in anti-static packaging with a serialized test record.

• 12-Month Replacement Warranty: If the unit fails under normal operating conditions within 12 months of the invoice date, TOPNLMS will ship a replacement unit at no charge.
• DOA Policy: Dead-on-arrival units are replaced within 48 hours of confirmed fault report, with return shipping covered by TOPNLMS.
• After-Sales Response: Technical support is available via email ([email protected]) and phone (+86 18359293191) during business hours (UTC+8).
• Procurement Assurance: TOPNLMS issues a commercial invoice and packing list with every shipment, suitable for customs clearance and internal procurement records.

For bulk orders, long-term supply agreements, or consignment stock arrangements, contact our sales team directly. We support NET payment terms for qualified B2B accounts.

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