Siemens 6FC5357-0BB35-0AB0 SINUMERIK 840D NCU 573.5B CNC
Manufacturer: Siemens
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Part Number: 6FC5357-0BB35-0AB0
Condition：New with Original Package
Product Type: Numerical Control Units
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Siemens 6FC5357-0BB35-0AB0 SINUMERIK 840D/DE Numerical Control Unit
The Siemens 6FC5357-0BB35-0AB0, also cataloged as the 6FC5357-0BB35-0AB0 Numerical Control Unit, operates as a dedicated hardware component for multi-axis motion control and PLC execution within SINUMERIK 840D/DE system architectures. Powered by an Intel Pentium M 1.4 GHz processor, the unit directly executes complex trajectory algorithms while interfacing with an integrated S7-300 PLC core across internal communication lines.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 6FC5357-0BB35-0AB0 |
| Brand | Siemens |
| Origin | Germany |
| Weight | 3.64 lbs (1.65 kg) |
| Dimensions | Standard SINUMERIK 840D NCU subrack enclosure |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | System backplane supplied (24 VDC nominal) |
| Core Processor | Intel Pentium M / 1.4 GHz |
| NC Memory | 3 MB |
| DRAM Memory | 128 MB |
| SRAM Memory | 8 MB |
| Integrated PLC | S7-300 PLC 317-2 DP (128 KB Work Memory) |
| Communication Interfaces | PROFIBUS DP (prepared) |
| Safety Standard | IEC 61508 compliant |
Siemens Fieldbus and Backplane Determinism
The NCU 573.5B module utilizes high-velocity backplane bus communication channels to establish deterministic synchronization between the numerical control core and the embedded S7-300 PLC 317-2 DP engine. Networked I/O points and external drives transfer high-speed control data via PROFIBUS DP interface protocols. Engineers must verify firmware flash compatibility across both the system flash card and the active PLC CPU partition prior to commissioning to avoid bus communication timeouts during initial boot cycles.
Frequently Asked Questions
Q: Is hot-swapping supported for the 6FC5357-0BB35-0AB0 module during active subrack operation?
A: No, you must completely disconnect the main 24 VDC subrack power supply before removing or inserting the NCU module. Pulling the module while energized causes backplane signal interruptions and risks corrupting volatile parameters stored in internal SRAM.
Q: How does the NCU retain program data during an external power failure?
A: The onboard 8 MB SRAM retains active machine data and NC parameters via a backplane battery backup circuit. You must routinely verify battery voltage levels to ensure persistent data integrity during prolonged power outages.
Field Installation Guidelines
Mount the unit firmly into its designated slot within the SINUMERIK 840D rack assembly. Tighten all mechanical locking fasteners to provide a low-impedance ground path between the module frame and the subrack chassis. Maintain a minimum vertical clearance of 100 mm above and below the module enclosure to allow adequate heat dissipation across the passive cooling surfaces.
Connect PROFIBUS DP network interfaces using double-shielded twisted-pair cables. Secure cable shields directly to ground using grounding clamps positioned near the enclosure cable entrance. Route all communication lines separately from high-voltage motor power leads, maintaining a minimum clearance distance of 200 mm to suppress electromagnetic interference.