6ES7312-5BF04-0AB0
Condition Options
How to Order or Request a Quote
Buy/Add to Cart Option
Purchase multiple part numbers and select from available conditions (Refurbished, New, etc.) in a single order.
Parts listed as "Ask" in the quantity field may still be available—add them to your cart to receive a quote.
Out-of-stock parts or those with limited availability can also be quoted. Our sales team will follow up promptly.
Need More?
When available stock is less than the quantity you need, please add the desired quantity to your cart and proceed with checkout to get a quote.
Have questions? Reach out to us for assistance—we’re here to help.
Express Quote
Use the Express Quote button to request pricing fast. (Available as a guest or logged in to your account)
Perfect for "Ask" quantity items or if you need more than what is listed.
If the price is listed, you will receive a quote immediately. If not, you will get a quote within 1–2 business days.
Our 2-year warranty is provided on all surplus parts.
Frequently Asked Questions
What does "Ask" mean?
"Ask" means pricing isn't listed. Submit a quote for pricing.
Can I order if the stock is low or out of stock?
Yes. Add the items to your cart for the desired quantity—our team will check for availability and pricing.
Can I mix conditions or part numbers?
Yes! Add multiple parts with different conditions into one quote when using the request quote button in your cart.
Do I need an account?
No. You can request quotes or order as a guest.
How long do quotes take?
Immediately, when the price is listed. Otherwise, quotes are typically returned within 1–2 business days.
Condition Levels
Used/Refurbished - These parts have been previously used, but are in good condition and clean. They have been refurbished but may have minor cosmetic or superficial flaws.
New Without Package - These parts are new. They have not been used, but their original packaging is no longer available.
New In Opened Package - These parts are new. They have not been used, but their original packaging has been opened or the packaging is significantly aged.
New In Sealed Package - These parts are new. They have not been used and still have their original package seal intact.
New in Original Package - These parts are new. The packages were not originally sealed by their original manufacturer.
Factory New - These are new and current items that are procured from the manufacturer.
Repair Service - Classic Automation will repair your item for the price and turnaround time listed.
See “Repair information” on this page for how to request an RMA Authorization/Quote
Note: Some items may not include all factory new accessories such as mounting brackets, connectors, keys, manuals, CDs, etc. Surplus parts might not be the most recent version, revision or date code currently offered by the original vendor.
Request a Quote
Request Repair Authorization
Part Number:
What Happens Next?
-
Step 1
You will receive an email with shipping instructions and your RA number.
-
Step 2
Print the RA email and include it in your shipment.
-
Step 3
Clearly label the box with your RA number.
-
Step 4
Securely pack the item and include a description of the issue.
-
Step 5
Ship your item to the address provided in the email.
Your Request Has Been Successfully Submitted!
Thank you! Your quote request has been submitted. You can track the status on the Quote page
Description
Overview
The SIEMENS 6ES7312-5BF04-0AB0 is an enhanced compact controller in the SIMATIC S7-300 automation family. This CPU 312C variant integrates 10 digital inputs, 6 digital outputs, two high-speed counters (10 kHz), an integrated 24 V DC power supply, and MPI communication for seamless system connectivity. With an expanded 64 KB of work memory, a 40-pole front connector, and support for a required Micro Memory Card (MMC), it provides robust processing capabilities for compact to mid-range automation tasks while maintaining full compatibility with the S7-300 modular architecture.
Explore our complete range of Siemens automation products — from PLC modules to HMIs, power supplies, drives, and more.
Browse Siemens Parts →Key Specifications
Applications
- Compact machine automation requiring integrated I/O and counter functions.
- Manufacturing, packaging, and assembly line coordination.
- Upgrades and retrofits within existing SIMATIC S7-300 installations.
Why Choose Classic Automation
When it comes to industrial automation, reliability, speed, and trust matter. At Classic Automation, we go beyond just supplying parts — we deliver confidence.
- Extensive Inventory Reach: Nearly 1 million automation parts at your fingertips, including legacy and obsolete models.
- 20+ Years of Expertise: Trusted by engineers and maintenance teams worldwide for our deep industry knowledge.
- Quality You Can Trust: Each unit is tested and refurbished to meet the highest performance standards.
- Fast Global Shipping: We help you minimize downtime with express logistics worldwide.
- 2-Year Warranty Available: Peace of mind with extended warranty options.
Whether you're maintaining legacy systems or building future-ready operations, Classic Automation is your dependable partner in precision and performance.
Shipping Information
Ships from Webster, NY USA
Requesting Your Repair/Repair Quotes
Repair Options can be used to obtain a repair authorization as a 'Guest' or logged into your 'Customer Account'
Add to Repair Cart
Using the 'Add to Repair Cart' option will add the specified quantity of repairable parts to your cart.
Use this when submitting multiple part numbers for your repair quote.
Follow the instructions in the email you provided to send in your repairs for a free evaluation.
(Note: Repair quote options are only available if there are no non-repairable parts in your cart or through the express quote option.)
Repair Now
Using the 'Repair Now' option allows you to submit a repair of your desired quantity for a single part number.
Fill out the information and follow the repair shipping instructions sent to the email you provided.
Find a copy of your express quote in your account or email.
The Repair Proccess
At Classic Automation, the industrial parts repair process focuses on functional testing. High-quality, comprehensively tested repairs are made with system-specific test fixtures. Hundreds of different testing fixtures are used to meet the variety of tests required, and all repaired items have a 2-year warranty.
Advanced diagnostic tools are used to quickly pinpoint the root problem. State-of-the-art equipment is available to replace high-density components for:
Control Systems Repair (DCS, PLC, CNC)
Panel Controllers Repair
HMI and Display Panels Repair
Industrial PCs Repair
Drives Repair (Inverter and Servo)
Power Supply Repair
As a preventive maintenance measure, all components subject to high degradation with age, such as electrolytic capacitors and NVRAM, are replaced. Great care is taken to retain application programs and data parameters.
Fixed-prices for repair services are offered. For many parts listed you can generate your own repair quote and repair authorization online.
If pricing is not listed, fast no-cost evaluation can be made to determine the repair pricing. In these cases, you will be contacted for approval prior to us starting any repairs.
Back-up and Documentation Services
Services to load, backup, or document your application programs are also available for a very wide range of control systems, panels, and drives. We can accept files via e-mail or may be able to upload them from equipment sent in for repair. Please contact us for additional details for your specific equipment.
Classic Automation provides high-quality, functionally tested industrial parts repair with system-specific test fixtures and a 2-year warranty.
Visit our Repair Page for an in depth overview of the repair process
Condition Levels
Used/Refurbished - These parts have been previously used, but are in good condition and clean. They have been refurbished but may have minor cosmetic or superficial flaws.
New Without Package - These parts are new. They have not been used, but their original packaging is no longer available.
New In Opened Package - These parts are new. They have not been used, but their original packaging has been opened or the packaging is significantly aged.
New In Sealed Package - These parts are new. They have not been used and still have their original package seal intact.
New in Original Package - These parts are new. The packages were not originally sealed by their original manufacturer.
Factory New - These are new and current items that are procured from the manufacturer.
Repair Service - Classic Automation will repair your item for the price and turnaround time listed.
See “Repair information” on this page for how to request an RMA Authorization/Quote
Note: Some items may not include all factory new accessories such as mounting brackets, connectors, keys, manuals, CDs, etc. Surplus parts might not be the most recent version, revision or date code currently offered by the original vendor.
Need more quantity or not sure it's the right part? Simply submit an Express Quote and we will get back to you quickly.
Shipping Information
- Our standard order processing time is 3 business days (5 business days for drives).
- For urgent needs, we offer same-day shipping on most items for orders placed before 2:00 PM EST. Simply select your preferred next-day shipping option at checkout, and your order will be prioritized to minimize downtime. Drives typically require a 3-business-day processing time for emergency orders, please contact us if you need the drive quicker.
- For repair services, typical turnaround is 2–4 weeks, depending on parts availability and service requirements.
Need more help?
Call us at +1 585-241-6010
Or email us at sales@classicautomation.com
You may also find the answer in our FAQ section
Request a Quote
Request Repair Authorization
Part Number:
What Happens Next?
-
Step 1
You will receive an email with shipping instructions and your RA number.
-
Step 2
Print the RA email and include it in your shipment.
-
Step 3
Clearly label the box with your RA number.
-
Step 4
Securely pack the item and include a description of the issue.
-
Step 5
Ship your item to the address provided in the email.
Your Request Has Been Successfully Submitted!
Thank you! Your quote request has been submitted. You can track the status on the Quote page
Related Products
Approaching 1 Million Parts
2-Year Warranty
23 + Years in Business
Emergency Shipping Available
What Happens After You Order?
Condition Levels
Classic Automation also sells new parts and products. We sell these either as the official distributor or through an official distributor that we have developed a relationship with.
| Condition | Description |
|---|---|
| Used/Refurbished Used | These parts have been previously used, but are in good condition and clean. They have been refurbished but may have minor cosmetic or superficial flaws. |
| Factory New New | These are new and current items that are procured directly from the manufacturer. |
| New In Sealed Package New | Parts are new. They have not been used and still have their original package seal intact. |
| New in Original Package New | These parts are new. The packages were not originally sealed by their original manufacturer. |
| New In Opened Package New | These parts are new. They have not been used, but their original packaging has been opened or the packaging is significantly aged. |
| New Without Package New | These parts are new. They have not been used, but their original packaging is no longer available. |
| Repair Service Service | Classic Automation will repair your item for the price and turnaround time listed. Go to our Repair page to learn more. |
Note: Some items may not include all factory new accessories such as mounting brackets, connectors, keys, manuals, CDs, etc. Surplus parts might not be the most recent version, revision or date code currently offered by the original vendor.
Classic Automation is not an authorized distributor unless otherwise specified, representative, or affiliate of the manufacturer of this product. All trademarks and documents are the property of their respective owners and are provided for identification and informational.