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Product description

Siemens 6FC5357-0BB21-0AE0 is an NCU 572.2 numerical control unit for SINUMERIK 840D/DE control systems. It performs central computing and memory tasks within a CNC controller, so the complete order number must be matched precisely when sourcing a replacement. The documented processor is a 486DX4 operating at 100 MHz. The NC system has 0.5 MB of memory, while the integrated PLC has 96 KB of working memory. The memory configuration also includes 8 MB of DRAM and 2 MB of SRAM. An integrated S7-300 PLC, type CPU 315-2 DP, is included, and the unit is prepared for PROFIBUS DP communication. It therefore suits machines whose control architecture depends on this exact NCU version, memory allocation and fieldbus connection. The variant is specified without system-software memory. This is important during replacement, recommissioning and backup because the software version, machine project and existing storage media must be considered separately. The documented net weight is 0.75 kg. For maintenance teams, the main comparison points are the complete 6FC order number, NCU type, processor, NC and PLC memory and PROFIBUS DP equipment. Visually similar modules or adjacent NCU revisions should not be treated as interchangeable solely because they share a family name. Before installation, check the slots, connected peripherals, PLC project, NC data, required system software, bus configuration and machine-specific backup for the existing SINUMERIK-840D/DE installation.

Siemens 6FC5357-0BB21-0AE0

Specifications

Manufacturer Siemens
Product series SINUMERIK 840D/DE, NCU 572.2
Manufacturer/order/identification number 6FC5357-0BB21-0AE0
Design / device type Numerical control unit (NCU)
Processor 486DX4
Clock frequency 100 MHz
NC memory 0.5 MB
PLC working memory 96 KB
DRAM 8 MB
SRAM 2 MB
Control / PLC unit Integrated S7-300 PLC, CPU 315-2 DP
Communication / protocol Prepared for PROFIBUS DP
System-software memory Not included
Weight 0.75 kg net
Control cabinet with PLC modules and automation components
Machine downtime in a production environment

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FAQ

Frequently asked questions

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What memory configuration does Siemens 6FC5357-0BB21-0AE0 have?

The documented configuration includes 0.5 MB of NC memory, 96 KB of PLC working memory, 8 MB of DRAM and 2 MB of SRAM.

Which controller and fieldbus connection are integrated?

The NCU 572.2 integrates an S7-300 PLC, type CPU 315-2 DP, and is prepared for PROFIBUS DP communication.

Is there a guarantee?

Yes, we provide a 14-day functional guarantee for used items. This means the component must be operational when received.

Please note that the guarantee only applies when the warranty seal is undamaged.

If a defect occurs within 14 calendar days, please contact us in writing. Subject to availability, we will provide a replacement or refund the full purchase price after return.

Further details are provided in the terms and conditions supplied with your quotation.

How quickly do you dispatch and which shipping options are available?

We generally dispatch immediately - in many cases on the same working day. For particularly urgent requirements or machine downtime, we find a suitable solution as quickly as possible and provide a specific delivery window on request.

Express shipping or collection from our premises is also possible, depending on the situation. State your requirements during the ordering process or contact us directly.

We ship worldwide and work with reliable shipping partners, from parcel services to freight forwarding. Freight shipments normally require some preparation so the goods arrive safely and undamaged.

Which payment methods are available?

Payment is normally made by bank transfer against invoice. Payment is due within 10 calendar days of receiving the goods.

As a rule, we offer purchase on account for all customers. In individual cases, such as new customers or particularly high-value components, we may agree advance payment. This decision is made individually and communicated transparently.

Can we return items if they were ordered incorrectly?

Because we sell exclusively to business customers (B2B), there is no general right of return and no consumer right of withdrawal.

Please note that returns of functioning goods are generally excluded. In justified exceptional cases, we can assess an individual solution, but this is not the standard procedure.

Is there a discount when ordering several items?

For larger order quantities or several items of one type, we can offer individual discounts.

Simply send us a quick enquiry - we check availability and will gladly prepare a tailored quotation with quantity pricing.

Do you also purchase industrial spare parts?

Yes, we also purchase automation components, such as frequency inverters, PLC assemblies, panels, servo motors and CPUs. Components from Siemens, Lenze, Schneider Electric, Control Techniques or Heidenhain are especially sought after, and other brands are also possible.

The process is straightforward: email us an inventory list or overview photos at info@reha-industriekomponenten.de. We calculate a market-based purchase price and send you an offer.

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