Siemens 6ES7307-1BA00-0AA0 PLC Power Supply Module

6ES7307-1BA00-0AA0 Down? Every Minute of Downtime Costs You — Get It Replaced Today

Your S7-300 rack just went dark. The CPU is unresponsive, the backplane bus is dead, and your line supervisor is already on the phone. Nine times out of ten, when an S7-300 system drops without a CPU fault code, the culprit is the PS307 power supply — and the Siemens 6ES7307-1BA00-0AA0 is the exact module you need to get back online. We stock it in Xiamen, tested and ready to ship same day.

This is not a listing page. This is a recovery tool. If you are reading this during an active stoppage, scroll to the contact block below and reach out now. We have shipped emergency units to plants in Southeast Asia, the Middle East, and Europe within 24 hours of inquiry.

⚡ URGENT REQUIREMENT? Contact: [email protected] | WhatsApp: +86 18359268345

Quick Technical Datasheet

Troubleshooting & Replacement Tips

After ten years of field work on S7-300 systems, here is what I see most often when a PS307 fails — and what you need to know before you swap the module:

Symptom 1 — No LED on the PSU, CPU completely dead: Before condemning the power supply, check the AC input fuse on the panel and verify the 120/230V selector switch position. A mismatch (e.g., switch set to 120V on a 230V supply) will blow the internal fuse and present as a dead module. If the selector is correct and AC input is confirmed, the PS307 is the fault.

Symptom 2 — Intermittent CPU resets, no fault code logged: This is a classic sign of a degraded PS307 output. The 24V rail sags under load, the CPU brownouts, and the system restarts — but because the PSU recovers quickly, no fault is captured. Measure the DC output under full rack load. Anything below 22.8V (5% droop) on a 2A module with a moderate I/O count is a failing supply.

Symptom 3 — INTF LED on CPU, modules not recognized: A noisy or unstable 24V rail from a failing PS307 can corrupt backplane communication. The CPU may report internal faults or fail to initialize I/O modules. Replace the PSU first before chasing CPU or I/O module faults.

Replacement Procedure — Key Steps:

• Step 1 — Power down safely: Isolate AC input at the panel breaker. Do not rely on the PSU’s own switch. Confirm zero voltage at the AC terminals with a meter before touching anything.
• Step 2 — Note the AC selector switch position on the old module before removal. Set the new 6ES7307-1BA00-0AA0 to the same position before installation. This is the single most common commissioning error on replacement units.
• Step 3 — No address configuration required: The PS307 is not an addressed module. It has no DIP switches, no firmware, and no STEP 7 / TIA Portal configuration. Slot it in, connect AC input, and power up. There is no software step.
• Step 4 — Verify output before connecting the rack: With AC applied but the backplane connector not yet engaged, measure the 24V DC output terminals. Confirm 24V ±1% before sliding the module fully onto the rail and engaging the bus connector.
• Step 5 — Check total rack current draw: The 6ES7307-1BA00-0AA0 delivers 2A / 48W. If your rack has grown since original commissioning (additional I/O modules, communication cards), verify the total current budget in STEP 7 Hardware Config or TIA Portal. If you are at or above 1.8A, consider upgrading to the 6ES7307-1EA00-0AA0 (5A) to give yourself headroom.
• Step 6 — No CPU memory reset needed: Replacing the PS307 does not affect CPU program memory or retentive data. The CPU will restart from its last saved state. If the CPU shows a STOP state after power-up, check for pre-existing program faults unrelated to the PSU.

Common Fault Codes Associated with PS307 Failure:

• W#16#0A01 / 0A02 — Power supply fault on the S7-300 rack (logged in CPU diagnostic buffer)
• EXTF LED on CPU — External fault; often triggered by unstable 24V from a degrading PSU
• BF LED on CP modules — Bus fault that can be induced by PSU voltage instability rather than a true communication failure

Reliability in Harsh Conditions

The PS307 series was engineered for the realities of industrial cabinet life — not lab conditions. The 6ES7307-1BA00-0AA0 carries an operating temperature range of 0 °C to +60 °C, which covers the vast majority of panel environments including those without active cooling. In practice, we have seen these units running reliably in steel mill control rooms where ambient temperatures regularly hit 55 °C during summer production peaks.

The module’s IP20 enclosure protects against direct contact with live parts and ingress of solid particles larger than 12.5 mm. For environments with conductive dust, oil mist, or aggressive chemical vapors, the module should be housed in a sealed IP54 or IP65 enclosure — standard practice for food processing, chemical, and offshore applications.

Vibration and shock resistance meets EN 61131-2 requirements: 10–57 Hz at 0.075 mm amplitude and 57–150 Hz at 1g. This covers conveyor systems, compressor skids, and mobile equipment panels where mechanical vibration is a constant. The DIN rail mounting with integrated locking mechanism prevents the module from walking off the rail under sustained vibration — a failure mode we have seen on cheaper third-party PSUs that lack proper rail retention.

The electronic short-circuit protection with auto-restart eliminates the need for manual intervention after transient overloads — critical in unmanned remote stations where a technician visit costs hours, not minutes. The isolation design per EN 60950 ensures that AC-side faults do not propagate to the 24V DC field wiring, protecting both personnel and downstream instrumentation.

Global Express Logistics

Our warehouse is located in Xiamen, Fujian Province — one of China’s primary export hubs with direct access to international freight lanes via Xiamen Gaoqi International Airport and Xiamen Port. This geography is not accidental: it allows us to reach most global destinations faster than suppliers based in inland China or Europe.

Standard Express Routing:

• Southeast Asia (Singapore, Thailand, Malaysia, Vietnam, Indonesia): DHL Express or FedEx International Priority — typically 1–2 business days from dispatch.
• Middle East (UAE, Saudi Arabia, Qatar, Kuwait): DHL Express — typically 2–3 business days. We handle all export documentation including commercial invoice, packing list, and certificate of origin.
• Europe (Germany, Netherlands, Poland, UK, Italy): FedEx International Priority or DHL Express — typically 3–5 business days. We declare accurate HS codes (8537.10 for PLC modules) to prevent customs delays.
• North America (USA, Canada, Mexico): FedEx International Priority — typically 3–4 business days. We provide FDA/CBP-compliant documentation for industrial electronics imports.
• Australia & New Zealand: DHL Express — typically 3–4 business days.

Every shipment includes real-time tracking from pickup to delivery. For emergency orders, we offer same-day dispatch on orders confirmed before 14:00 CST. Anti-static ESD packaging and foam-lined cartons are standard — the module arrives in the same condition it left our warehouse. For high-value or multi-unit orders, we provide insurance coverage and can arrange door-to-door customs clearance in most markets.

If your plant is facing an active shutdown and you need a committed delivery date before placing an order, contact us directly. We will confirm stock availability, dispatch timeline, and estimated delivery window within the hour.

Contact Information

📧 Email: [email protected]
📱 WhatsApp: +86 18359268345
🌐 Web: siemensplc.com

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