Description
The Siemens SINUMERIK 840D sl NCU 720.3B PN (6FC5372-0AA30-0AB0) is a numerical control unit for the SINUMERIK 840D sl system: B version of the NCU 720.3 PN with higher NC processing performance, integrated SIMATIC PLC 317-3 PN/DP, PROFINET and PROFIBUS DP on board; supplied with dual fan/battery module. It works with SINAMICS S120 drives over DRIVE-CLiQ and runs the NC kernel, PLC program and axis interpolation. At JJ Automation it is available new and as tested used / refurbished — checked before dispatch and backed by warranty.
When to replace
Control not booting, watchdog or NCK system alarms, corrupted SRAM / CF card data, repeated battery-backup failures, or physical damage after a power event. Before swapping: back up your machine data, PLC program and drive parameters — a control unit without this machine's own data cannot run it. Our free guides: SINUMERIK backup guide · 840D alarm list · referencing after a control change.
Details
| Part Number | 6FC5372-0AA30-0AB0 |
| Model | NCU 720.3B PN |
| System | SINUMERIK 840D sl |
| Type | Numerical Control Unit (NCU) |
| Integrated PLC | SIMATIC 317-3 PN/DP |
| Interfaces | PROFINET, PROFIBUS DP, Ethernet, DRIVE-CLiQ |
| Scope | Incl. dual fan/battery module and battery |
| Brand | Siemens |
| Condition | New & Used / Refurbished |
Need this part? Get a quote today.
Call or WhatsApp +91 88022 12394 — we ship across India and worldwide. Repair and exchange options are also available for Siemens SINUMERIK systems.
Related: SINUMERIK controllers & panels · Siemens PCB boards · SINAMICS / SIMODRIVE drives
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