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2-year Warranty

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Siemens 6FC5357-0BB25-0AA0

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2 Year warranty

Part Number6FC5357-0BB25-0AA0
Model #6FC53570BB250AA0
Warranty2 Year
Software Profibus DP
Input20.4 to 28.8 V dc
Operating frequency650 MHz
Unit TypeNCU
Memory6 MB (CNC);768 kB (PLC)
Dimensions50 mm x 207 mmx 316 mm

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MRO Electric repairs CNCs, PLCs, Servo/Spindle Drives, Motors, Amplifiers, VFDs, HMIs, and more, most of which can be repaired in only 3-5 days.

Repair Benefits

MRO can restore your failed 6FC5357-0BB25-0AA0 to remanufactured condition and save you up to 75% compared to buying new. We offer standard repair pricing to ensure you the best value for your repair.

Our certified technicians use rigorous testing procedures to ensure your parts are restored to fully functioning condition. Our team proudly stands behind all repairs by providing a minimum 2-year warranty.

Our technicians have vast experience with most manufacturers and models. In addition to this 6FC5357-0BB25-0AA0 we also repair a wide range of other Siemens products, so if you don’t see the model you need, please contact us.

Core Exchange

If you are interested in getting credit for your faulty 6FC5357-0BB25-0AA0, just let us know, and we can issue you an RMA to send it in as an exchange. Our exchange program provides you with savings and keeps us stocked for the next time you need anything.

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Ask about exchanging your faulty 6FC5357-0BB25-0AA0 for credit when ordering from MRO Electric

MRO Electric provides a 2-year warranty on every item we sell and repair. We stand behind all of our products and guarantee them for the full 2 years. If there is an issue with any of our products within the warranty period, we will evaluate the unit and repair or replace it under warranty.

Siemens 6FC5357-0BB25-0AA0 Overview

The 6FC5357-0BB25-0AA0 is a version 572.5 NCU module manufactured by Siemens for use on the SINUMERIK 840 D.  The SINUMERIK 840 D module 6FC5357-0BB25-0AA0 NCU, or number control module, is part of the 5xx.5 series of the SIMODRIVE 611 line of drive modules available from Siemens.  These 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.

The performance variants for the 6FC5357-0BB25-0AA0 are as follows. This unit uses a Celeron 650 MHz processor and includes 6 MB of CNC user memory.   PLC: PLC 317-2DP, PLC memory: 128 / 768 KB. It has a type 3 front panel with no fan box.

Features of the Siemens 6FC5357-0BB25-0AA0

The NCU module 6FC5357-0BB25-0AA0 is the CPU of the SINUMERIK 840 D. It is in control of the communication tasks for the CNC and PLC. There are a few features that are standard for the 5xx.5 series NCU modules.  Some of these standard features include a standard PCMCIA card, four high-speed NC inputs as well as four rapid NC outputs.  Also, the standard on the 6FC5357-0BB25-0AA0is two measuring pulse inputs, two handwheel inputs, and monitoring of both the voltage and the temperature.

Components associated with the NCU module 6FC5357-0BB25-0AA0

Several modules make up the components working with the 6FC5357-0BB25-0AA0module. The first one of these components that the Siemens NCU module 6FC5357-0BB25-0AA0 is a part of is the NCU box which is the module rack for the 6FC5357-0BB25-0AA0 and has three parts. The NCU box has an NC rack assembly with a cable distributor, a battery/fan unit that slides into the box, and a housing unit made of sheet metal. The housing unit is integrated with guide bars that allow for the NCU, the fan and battery part, and the power supply module to fit inside neatly.

The next coordinating component for the Siemens 6FC5357-0BB25-0AA0 is the fan box. This unit is only absolutely required for the 573.3 (Pentium III) and 573.4 (Pentium III) NCUs and can be mounted to the NCU box if need be.

Another coordinating component for the Siemens 6FC5357-0BB25-0AA0 is the PLC module as a submodule of the NCU. 

This module assists in machine monitoring. It also serves as a PLC-CPU compatible with the S7-300 group of units.

COM modules are a submodule of the NCU and are an associated component as well. The task of the COM module is to communicate with the PCU and the peripherals of the PCU.

The driver module is another component associated with the Siemens 6FC5357-0BB25-0AA0 NCU module. Also, a submodule of the NCU, the driver module forms the interface to several units.It is the interface for the operator's front panel, the programming device, the decentralized peripherals, and the S7-300 peripherals.

The final coordinating component of the Siemens 6FC5357-0BB25-0AA0 NCU module is the PCMCIA card. The PCMCIA card has a couple of functions. It serves as the bulk memory for the NC system software, and it can be used for the start-up.  To operate the PCMCIA cards, the NCU has a plug-in unit that allows standard PCMCIA as well as PC cards or NC cards to be inserted. Type II flash cards up to 8 MB storage capacity can be operated through the plug-in.

Contact Us Today For More Information About Siemens Products

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, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6FC5357-0BB25-0AA0, 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 6FC5357-0BB25-0AA0 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.

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Very happy with the overall service, delivery, communication and delivery,

Conley Cooke

I needed a special drive, found it, and I was quickly assisted by Joe Kaminski. Everything was exactly as it should be....


We have an older DMU80 CNC Machine and the Handheld Control was damaged beyond repair. MRO was very helpful in confirmin...

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