Siemens 6FC5357-0BB35-0AB0 SINUMERIK 840D/DE NCU 573.5B CNC Hardware
01Product Profile
Siemens 6FC5357-0BB35-0AB0 is SINUMERIK 840D/DE NCU 573.5B CNC hardware with a 1.4 GHz processor and 128 MB memory. The spare-part unit provides 3 MB NC user memory and 128 KB PLC user memory and is prepared for PROFIBUS DP. It is supplied without system software. This B-generation article must be matched by its full MLFB because the similarly named NCU 573.5 uses a 933 MHz processor and 64 MB memory.
02Technical Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6FC5357-0BB35-0AB0 |
| Product Family | SINUMERIK 840D/DE |
| Product Designation | NCU 573.5B |
| Component Type | CNC hardware / numerical control unit |
| Processor Frequency | 1.4 GHz |
| Memory | 128 MB |
| NC User Memory | 3 MB |
| PLC User Memory | 128 KB |
| Fieldbus Preparation | PROFIBUS DP prepared |
| System Software | Not included |
| Lifecycle Status | Cancelled since April 2015; spare part |
03System Role
Control Function
- Combines NC execution and integrated PLC processing in the documented SINUMERIK 840D/DE architecture.
- Coordinates the machine-control sequence, axis and spindle commands, field I/O and configured communications.
- Provides the NCU 573.5B performance and memory level for compatible installed systems.
- Uses the machine-specific system software, PLC project, NC data and drive configuration as separate controlled assets.
- Acts as a service-replacement core for equipment that retains the 840D/DE NCU 573.5B platform.
Key Capabilities
- The B-generation NCU 573.5 hardware uses a 1.4 GHz processor.
- A 128 MB memory level distinguishes it from the 64 MB NCU 573.5 article.
- Official product data identifies 3 MB NC user memory and 128 KB PLC user memory.
- The control hardware is prepared for PROFIBUS DP integration.
- The article is delivered without system software, allowing the validated installed software set to be restored separately.
04Compatibility
- Match the complete 6FC5357-0BB35-0AB0 order number and NCU 573.5B designation.
- Do not copy processor or memory values from 6FC5357-0BB35-0AA0; that article is NCU 573.5, not 573.5B.
- Confirm the SINUMERIK software release, licenses, memory card, machine archive and PLC project before exchange.
- Verify PROFIBUS addresses, network termination, I/O configuration and all dependent drives and peripherals.
- System software is not included with the hardware and must be restored from an approved source.
- Replacement and commissioning should follow the machine builder procedure and all applicable safety controls.
05Applications
- Spare-part replacement in compatible SINUMERIK 840D/DE NCU 573.5B systems.
- Maintenance of CNC machines requiring the documented 1.4 GHz NCU generation.
- Restoration of NC and PLC processing after a confirmed control-unit failure.
- PROFIBUS DP-based machine architectures configured for the exact article.
- Lifecycle stocking for cancelled equipment with a recoverable machine archive.
- Controlled modernization assessments that first preserve the current software, licenses and peripheral design.
06FAQ
What is Siemens 6FC5357-0BB35-0AB0?
It is SINUMERIK 840D/DE NCU 573.5B CNC hardware with a 1.4 GHz processor and 128 MB memory.
How much NC and PLC user memory is provided?
The article is identified with 3 MB of NC user memory and 128 KB of PLC user memory.
Does the hardware include system software?
No. Siemens states that the NCU is supplied without system software.
How does it differ from 6FC5357-0BB35-0AA0?
The 0AB0 article is NCU 573.5B with a 1.4 GHz processor and 128 MB; the 0AA0 article is NCU 573.5 with 933 MHz and 64 MB.
What is the official net weight?
Siemens lists 1.190 kg for the exact article.
What must be tested after replacement?
Test software restoration, PLC startup, NC channels, axes, spindles, PROFIBUS I/O, diagnostics and all machine safety functions.
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