Siemens 6FC5373-0AA30-0AA1

Siemens 6FC5373-0AA30-0AA1 SINUMERIK 840D sl NCU 730.3 PN — Overview

The Siemens 6FC5373-0AA30-0AA1 is an NCU 730.3 PN for the SINUMERIK 840D sl platform, engineered to deliver high-end CNC performance with integrated PLC logic and robust Profinet networking. Designed for multi-axis, multi-channel machine tools, this unit brings fast program execution, precise motion control, and dependable automation into a compact controller that's easy to integrate and service.

Performance and Memory

Built for demanding CNC tasks, the NCU offers CNC user memory of 3 MB for programs, parameters, and cycles, paired with a PLC user memory of 512 KB via the integrated PLC 317-3PN/DP. This balanced memory architecture supports complex parts, custom cycles, and reliable machine sequencing without bottlenecks, helping reduce cycle times and improve surface finish on high-precision jobs.

Integrated PLC and Networking

With a built-in PLC 317-3PN/DP, the controller seamlessly handles machine I/O, interlocks, and safety logic while coordinating motion on the CNC side. Native PROFINET (PN) connectivity simplifies device wiring, diagnostics, and cell-level communication, while PROFIBUS/DP capability enables broad compatibility with legacy field devices in brownfield environments.

Thermal Design and Reliability

The NCU 730.3 PN features internal heat dissipation to keep the electronics at optimal operating temperatures, supporting long service life and stable performance on the shop floor. This thermal approach reduces the need for complex external cooling, streamlining cabinet design and maintenance access.

Applications and Use Cases

Ideal for turning centers, milling machines, grinding, and multi-technology production cells, the 6FC5373-0AA30-0AA1 excels in high-speed machining, advanced tool management, and multi-axis synchronization. OEMs and retrofitters value its predictable performance, while end users benefit from consistent part quality and easier program standardization across lines.

Fast Deployment with MRO Electric

MRO Electric and Supply provides the Siemens 6FC5373-0AA30-0AA1 with free shipping, a 2-year warranty, and immediate availability to minimize downtime. Each unit is tested, professionally packed, and supported by knowledgeable staff who understand CNC controls, drives, and automation ecosystems.

Maintenance and Lifecycle Support

From commissioning to routine service, the NCU's diagnostics and networked architecture simplify troubleshooting. With MRO Electric's technical support and warranty coverage, you can deploy confidently and keep your production assets running at peak efficiency.

Key Specs at a Glance

Model: 6FC5373-0AA30-0AA1 | Platform: SINUMERIK 840D sl NCU 730.3 PN | Integrated PLC: 317-3PN/DP | CNC User Memory: 3 MB | PLC User Memory: 512 KB | Thermal: Internal heat dissipation | Availability: Immediately available | Perks: Free shipping, 2-year warranty from MRO Electric and Supply.

High-level CNC controller with integrated PLC and PN/DP networking, backed by MRO Electric's immediate availability, free shipping, and a 2-year warranty—everything you need to restore production quickly and reliably.

What does the model number 6FC5373-0AA30-0AA1 represent?

It identifies a Siemens SINUMERIK 840D sl NCU 730.3 PN configuration with specific memory and interface options suited for high-end CNC applications.

How much memory does this NCU provide?

It includes 3 MB CNC user memory for programs and data, plus 512 KB PLC user memory on the integrated PLC 317-3PN/DP.

Is a PLC included, or do I need a separate unit?

A PLC is integrated—Siemens PLC 317-3PN/DP—so motion control and machine logic reside in one controller for more straightforward integration.

What fieldbuses are supported?

It supports PROFINET (PN) for modern networking and PROFIBUS/DP via the PLC interface for compatibility with established devices.

What is meant by internal heat dissipation?

The controller is designed to manage heat within the unit and cabinet efficiently, improving reliability and reducing external cooling complexity.

Which machines are a good fit?

CNC mills, lathes, grinders, and multi-axis machining centers that require fast interpolation, stable paths, and deterministic I/O.

Can this unit help reduce downtime?

Yes—immediate availability from MRO Electric, straightforward networking, and integrated diagnostics speed replacement and commissioning.

Does MRO Electric offer a warranty?

Yes, purchases include a 2-year warranty from MRO Electric and Supply for added confidence and support.

Is shipping included?

MRO Electric provides free shipping, helping you control maintenance budgets and accelerate delivery.

How quickly can I get one?

Units are immediately available from stock, allowing rapid replacement during planned maintenance or unexpected failures.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry Accessories from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About the 6FC5373-0AA30-0AA1

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6FC5373-0AA30-0AA1, take a look at more from our Accessories line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 6FC5373-0AA30-0AA1 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.