Siemens 6FC5357-0BB34-0AA0 SINUMERIK 840D/DE NCU 573.4 CNC Hardware
01Overview
Siemens 6FC5357-0BB34-0AA0 is SINUMERIK 840D/DE NCU 573.4 CNC hardware with a 650 MHz processor and 64 MB memory. The spare-part hardware is supplied without system software and provides 2.5 MB NC user memory plus 96 KB PLC user memory, with PROFIBUS DP preparation. Its identity, memory level and processor generation differ from the NCU 573.5 and NCU 573.5B articles in this batch.
02Specs
| Manufacturer | Siemens |
|---|---|
| Article Number | 6FC5357-0BB34-0AA0 |
| Product Family | SINUMERIK 840D/DE |
| Product Designation | NCU 573.4 |
| Component Type | CNC hardware / numerical control unit |
| Processor Frequency | 650 MHz |
| Memory | 64 MB |
| NC User Memory | 2.5 MB |
| PLC User Memory | 96 KB |
| PLC Platform | PLC 314C-2DP |
| Fieldbus Preparation | PROFIBUS DP prepared |
| System Software | Not included |
| Commercial Position | Spare part |
03Features
Key Functions
- NCU 573.4 hardware combines the CNC and integrated PLC functions of the documented 840D/DE generation.
- The exact article uses a 650 MHz processor and 64 MB memory.
- Official product data identifies 2.5 MB of NC user memory and 96 KB of PLC user memory.
- The associated PLC platform is PLC 314C-2DP.
- The hardware is prepared for PROFIBUS DP system integration.
- NCU 5xx.4 documentation identifies fast NC I/O, measuring-input, handwheel-input, voltage-monitoring and temperature-monitoring functions for this hardware family.
Product Identity
- Manufacturer: Siemens
- Model: 6FC5357-0BB34-0AA0
- Product Type: SINUMERIK 840D/DE NCU 573.4 numerical control unit
- Status: Spare part
04Applications
- Spare-part replacement in a compatible SINUMERIK 840D/DE NCU 573.4 system.
- Maintenance of legacy CNC machines that retain the 650 MHz control generation.
- Restoration of the integrated NC and PLC hardware after an NCU fault.
- PROFIBUS DP-based machine-control architectures configured for the original NCU.
- Lifecycle stocking where the NC software, PLC program and machine data can be restored.
- Controlled repair workflows that preserve the installed memory and peripheral configuration.
05Lifecycle
- Siemens identifies this exact hardware as a spare part.
- The unit is supplied without system software, so software media, licenses, archives and machine data require separate control.
- Do not substitute NCU 573.5 or NCU 573.5B data; their processor and memory generations differ.
- Record the NCU article, software version, memory card, PROFIBUS configuration, drive data and machine archive before exchange.
- After replacement, restore the approved software and test PLC startup, NC functions, axes, spindles, I/O, handwheels, measuring inputs and diagnostics.
06FAQ
What is Siemens 6FC5357-0BB34-0AA0?
It is SINUMERIK 840D/DE NCU 573.4 CNC hardware for a compatible legacy control system.
Which processor and memory are identified?
The exact article is listed with a 650 MHz processor and 64 MB memory.
How much NC and PLC user memory is provided?
Siemens identifies 2.5 MB of NC user memory and 96 KB of PLC user memory.
Is system software included?
No. The official product description states that the hardware is supplied without system software.
Is it equivalent to NCU 573.5?
No. NCU 573.5 is a different processor and memory generation with a different complete order number.
What must be tested after replacement?
Validate software restoration, PLC startup, NC channels, axes, spindles, fieldbus I/O, diagnostics and all machine safety functions.
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