Siemens 6FC5357-0BB15-0AA0 SINUMERIK 840D NCU 571.5 Module
Manufacturer: Siemens
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Part Number: 6FC5357-0BB15-0AA0
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 6FC5357-0BB15-0AA0 SINUMERIK 840D/DE Numerical Control Unit
The Siemens 6FC5357-0BB15-0AA0, also cataloged as the 6FC5357-0BB15-0AA0 Numerical Control Unit, operates as a dedicated hardware component for multi-axis motion control and integrated PLC execution within SINUMERIK 840D/DE CNC systems. It processes deterministic trajectory calculations while coordinating local I/O operations through an integrated S7-300 processor core over backplane and fieldbus links.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 6FC5357-0BB15-0AA0 |
| Brand | Siemens |
| Origin | Germany |
| Weight | Standard NCU frame weight ( 2.0 kg) |
| Dimensions | Standard SINUMERIK 840D NCU enclosure width |
| Operating Temp | 0 to 55 deg C |
| Power Consumption | System backplane supplied (24 VDC nominal) |
| Core Processor | Intel Pentium III / 400 MHz |
| NC Memory | 3 MB |
| DRAM Memory | 64 MB |
| SRAM Memory | 8 MB |
| Integrated PLC | S7-300 CPU 317-2 DP (128 KB Work Memory) |
| Communication Interface | PROFIBUS DP |
| Safety Standard | IEC 61508 compliant |
Siemens Fieldbus and Backplane Determinism
The NCU 571.5 module utilizes a dedicated internal backplane interface that links the integrated motion control engine directly to the S7-300 PLC subsystem. Communication across field networks relies on the PROFIBUS DP deterministic protocol to ensure precise synchronization between axis drives and external I/O nodes. This architecture limits execution jitter during multi-axis interpolation. Firmware flashing requires matching firmware releases between the NCU system software card and the active PLC CPU partition to prevent bus handshake timeouts during initial startup.
Frequently Asked Questions
Q: Can the 6FC5357-0BB15-0AA0 NCU module be replaced or hot-swapped while the subrack remains powered?
A: No, you must completely isolate the 24 VDC system power supply before extracting or inserting the NCU module. Removing the hardware while the rack is energized risks backplane bus disruption and permanent memory corruption on the internal SRAM storage.
Q: How does the module handle PLC and NC memory retainage during a total power outage?
A: The NC module utilizes onboard battery-buffered SRAM to retain active machine data, zero offsets, and PLC flags. Ensure the backplane backup battery is fully functional prior to scheduled system shut downs to avoid configuration loss.
Field Installation Guidelines
When mounting the NCU 571.5 inside the control cabinet, engineers must secure the unit onto the designated SINUMERIK subrack using standard torque limits. Maintain a minimum vertical clearance of 100 mm above and below the housing to facilitate natural convection cooling across the heat sink channels.
All PROFIBUS DP communication lines must use double-shielded twisted-pair cable. Connect cable shields directly to ground via low-impedance grounding clamps located immediately near the interface entry point. Ensure signal cables maintain a minimum physical separation distance of 200 mm from high-voltage motor power leads to mitigate high-frequency electromagnetic interference.