Siemens 6FC5372-0AA30-0AB0 SINUMERIK 840D sl NCU 720.3B PN CNC Control
01Product Profile
Siemens 6FC5372-0AA30-0AB0 is a SINUMERIK 840D sl NCU 720.3B PN CNC control with integrated PLC 317-3PN/DP and an included twin fan module. The exact article has 2 GB DRAM, 1 MB nonvolatile memory, a maximum active-power value of 352 W and typical power loss of 24 W. Its IP20 open-type design operates from 0 to 55 degrees C and measures 50 x 455 x 272 mm. Siemens currently positions it as a spare part under phase-out.
02Technical Data
| Manufacturer | Siemens |
|---|---|
| Article Number | 6FC5372-0AA30-0AB0 |
| Product Family | SINUMERIK 840D sl |
| Product Designation | NCU 720.3B PN |
| Integrated PLC | PLC 317-3PN/DP |
| Cooling Module | Twin fan module included |
| Input Voltage | 24 V DC |
| Working Memory | 2 GB DRAM |
| Nonvolatile Memory | 1 MB |
| Maximum Active Power | 352 W |
| Typical Power Loss | 24 W |
| Degree of Protection | IP20 / UL open type |
| Operating Temperature | 0 to 55 degrees C |
| Transport Temperature | -40 to 70 degrees C |
| Storage Temperature | -25 to 55 degrees C |
| Relative Humidity | 5 to 95 percent |
| Lifecycle Status | Phase-out announced since October 2023; spare part |
03System Role
Control Function
- Executes SINUMERIK 840D sl CNC tasks and integrated PLC 317-3PN/DP machine logic.
- Coordinates the configured drives, PROFINET and PROFIBUS networks, field I/O and operator components.
- Provides the NCU 720.3B PN memory and cooling platform for compatible machines.
- Maintains nonvolatile control data while the machine-specific software, licenses and archive remain controlled separately.
- Serves as the Siemens-named successor platform for 6FC5372-0AA30-0AA1 after a validated migration.
Key Capabilities
- NCU 720.3B PN combines CNC processing with the integrated PLC 317-3PN/DP.
- Two gigabytes of DRAM and one megabyte of nonvolatile memory are specified for the exact article.
- A twin fan module is included with the control.
- Maximum active power is 352 W and typical power loss is 24 W.
- The IP20 open-type unit supports operation from 0 to 55 degrees C and 5 to 95 percent relative humidity.
04Compatibility
- Match the complete 6FC5372-0AA30-0AB0 order number and NCU 720.3B PN designation.
- Confirm the 24 V DC supply, current capacity, twin-fan module, cabinet airflow and IP20 installation environment.
- Verify CNC software, CompactFlash card, licenses, PLC project, machine archive and drive configuration.
- Confirm PROFINET names and addresses plus PROFIBUS parameters, topology and termination.
- Although Siemens names this article as successor to 6FC5372-0AA30-0AA1, the memory, power and cooling differences require an engineered migration.
- Validate every axis, spindle, I/O path, network, diagnostic and safety function before production return.
05Applications
- Spare-part replacement in compatible SINUMERIK 840D sl NCU 720.3B PN systems.
- Engineered migration from NCU 720.3 PN article 6FC5372-0AA30-0AA1.
- CNC systems using integrated PLC 317-3PN/DP and combined PN/DP networks.
- Machine restoration where the correct software, licenses, CompactFlash card and archive are available.
- Lifecycle stocking for phase-out equipment with documented cooling and power requirements.
- Modernization planning that preserves current drive, I/O, HMI and safety behavior.
06FAQ
What is Siemens 6FC5372-0AA30-0AB0?
It is a SINUMERIK 840D sl NCU 720.3B PN CNC control with PLC 317-3PN/DP and an included twin fan module.
What memory is specified?
The official technical data specifies 2 GB DRAM and 1 MB nonvolatile memory.
What are the power values?
The article is specified at 24 V DC input, 352 W maximum active power and 24 W typical power loss.
What are the dimensions and net weight?
The exact article measures 50 x 455 x 272 mm and has a net weight of 3.9 kg.
Is this the successor to 6FC5372-0AA30-0AA1?
Yes. Siemens identifies it as the successor, but the complete migration still requires compatibility review and validation.
What must be tested after replacement?
Verify cooling, power, software and archive loading, PLC and CNC startup, networks, drives, I/O, diagnostics and all required safety tests.
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