Description
The listed 6SL3244-0BB13-1BA1 and 6SL3243-0BB30-1NN3 are Siemens SINAMICS CU240B-2 / CU240E-2 Control Units — the “brain” of a modular SINAMICS G120 drive, which consists of PM (Power Module, 6SL3210-1PE…) + CU (Control Unit, 6SL324x) + optional Operator Panel (IOP/BOP-2). The CU mounts onto the PM’s front interface and provides:
- Motor control algorithms (V/f, FCC, Vector control)
- Fieldbus communication (Profibus DP or Profinet, per model)
- Digital/analog I/O (on-CU terminals — G120 PM itself has minimal I/O; most I/O is on CU)
- Safety functions (depending on CU grade)
- Parameterization via STARTER or SINAMICS Startdrive (TIA Portal)
Model decoding:
- 6SL3244-0BB13-1BA1 → CU240B-2 DP (B = Basic grade, 2 = 2nd gen; DP = Profibus DP communication). This is the entry-level CU for G120 — basic I/O, no extended safety (only STO via terminals if wired externally), Profibus DP only. Suitable for simple V/f or vector applications where cost matters.
- 6SL3243-0BB30-1NN3 → CU240E-2 PN (E = Enhanced grade, 2 = 2nd gen; PN = Profinet communication). This is the mid-grade CU — more I/O than B, built-in safety: STO (Safe Torque Off, SIL3 / PL e) + SS1 (Safe Stop 1) + SLS (Safe Limited Speed) via PROFIsafe (needs F-CPU or F-PLC upstream), more DI/DO/AI/AO than B. Profinet (PN) with RT/IRT capable.
Both CUs fit the same G120 PM240-2 / PM250 power modules (0.37 kW – 250 kW range, across frame sizes FSA–FSG). The CU clicks onto the PM’s front — no wiring between PM & CU (internal bus). Then field wiring (motor, I/O, brake, encoder if using CU’s encoder card) goes to CU terminals or optional add-on boards (e.g., SINAMICS Connect 300 for cloud, or CU240E-2 with encoder module 6SL3252-0…).
Key Features (CU240E-2 PN — 6SL3243-0BB30-1NN3 as representative)
- Communication: Profinet (RT/IRT) — 2× RJ45 ports (switch integrated — daisy-chain drives on Profinet ring)
- Safety (E-grade): STO (SIL3/PL e) integrated, SS1, SLS via PROFIsafe (needs F-PLC), Safe Brake Control
- Control Modes: V/f (linear / parabolic / FCC), Sensorless Vector (SLVC), Vector with encoder (if encoder module added)
- I/O (on CU240E-2): 6× DI (configurable sink/source), 2× DO (relay or transistor), 2× AI (0–10V / 4–20mA), 2× AO (0–10V) — more than B-grade
- Encoder Support: Via add-on encoder module (order separately — e.g., HTL/TTL/SSI/Resolver interface on CU240E-2; CU240B-2 does NOT support encoder module)
- Parameterization: STARTER (classic) or Startdrive (inside TIA Portal) — project file
.zxu/ TIA device - Operator Panel: Compatible with IOP-2 (Intelligent Operator Panel, 6SL3255-0AA10-0CA0) or BOP-2 (basic 2-line)
- Country of Origin: Germany / Austria (Siemens AG)
⚠️ CU240B-2 vs CU240E-2 Quick Compare:
Model & Variant Reference (Your Two Listed)
Model | CU Type | Comm | Safety | Best For |
|---|---|---|---|---|
6SL3244-0BB13-1BA1 | CU240B-2 DP | Profibus DP (12 Mbps) | External STO only (no PROFIsafe) | Simple V/f apps, cost-sensitive, existing Profibus network |
6SL3243-0BB30-1NN3 | CU240E-2 PN | Profinet RT/IRT (2× RJ45, switch) | STO/SS1/SLS via PROFIsafe (SIL3) | Machines needing safety + encoder + more I/O, Profinet network |
💡 How to build a complete G120: Choose PM (e.g., 6SL3210-1PE21-1UL0 = PM240-2, 0.75kW, 480V) + CU (above) + Operator Panel (IOP-2 recommended) + optional brake resistor (if PM250) or line filter (4-slotted). The CU snaps onto PM front — internal bus handles power-stage communication.
Technical Specifications (6SL3243-0BB30-1NN3 — CU240E-2 PN, Representative)
Parameter | Specification |
|---|---|
Model / Order Code | 6SL3243-0BB30-1NN3 (Siemens SINAMICS CU240E-2 PN Control Unit) |
Series | SINAMICS G120 (modular — pairs with PM240-2 / PM250 power modules) |
Control Modes | V/f (linear, parabolic, FCC), Sensorless Vector (SLVC), Vector with encoder (via add-on encoder module) |
Communication | Profinet RT/IRT — 2× RJ45 (integrated switch — daisy-chain) |
Safety Functions | STO (SIL3 / PL e) — terminal or PROFIsafe; SS1, SLS via PROFIsafe (requires F-PLC/F-CPU upstream) |
Digital I/O | 6× DI (24V DC, sink/source jumperable, 2 of them can be high-speed DI for PTI/encoder emulation), 2× DO (relay Form C or transistor — configurable) |
Analog I/O | 2× AI (0–10V / 4–20mA, 11-bit resolution), 2× AO (0–10V, 11-bit) |
Encoder Interface | Via add-on encoder module (order separately — supports HTL, TTL, SSI, Resolver — CU240B-2 does NOT support encoder) |
Motor Power Range (with PM) | 0.37 kW – 250 kW (depends on paired PM240-2 / PM250 frame size FSA–FSG) |
Parameterization SW | STARTER (standalone) / SINAMICS Startdrive (in TIA Portal) — project .zxu |
Operator Panels | IOP-2 (6SL3255-0AA10-0CA0 — recommended, graphical), BOP-2 (6SL3255-0AA00-0CA0 — basic 2-line) |
Permissible Ambient | 0 … +50 °C (operation), -25 … +70 °C (storage) |
Mounting | Snaps onto G120 PM front (internal bus — no wiring PM↔CU) |
Certifications | CE, UL, cUL, c-Tick, KC, RCM, SEMI F47 |
Country of Origin | Germany / Austria (Siemens AG) |
(CU240B-2 DP (6SL3244-0BB13-1BA1) is similar but: Profibus DP 12 Mbps, 4 DI / 1 DO / 1 AI, no encoder support, safety = external STO only, no PROFIsafe.)
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty (bench: mount on test PM → STARTER/Startdrive connect via Profinet/DP → parameterize, spin motor no-load, verify safety STO via PROFIsafe if E-grade)
- Technical support for:
- CU vs PM pairing (confirm your PM model — 6SL3210-1PE… PM240-2 or PM250 — CU240B/E fits all G120 PM frames; if you have SINAMICS G120C (compact all-in-one), that’s a different p/n (6SL3210-1…) — not CU-separate)
- B-grade vs E-grade selection (simple pump/fan/V/f → CU240B-2 saves cost; need safety (STO/SS1) or encoder or more I/O → CU240E-2 mandatory)
- Comm choice (existing Profibus network → CU240B-2 DP (6SL3244-BB13) or CU240E-2 DP (6SL3243-BB13); Profinet → BB30 suffix)
- STARTER / Startdrive first commission (PC → RJ45 (Profinet CU) or USB-to-DP adapter (for DP CU) → scan drive → wizard → motor data → control/torque/frequency limits → download)
- Safety STO wiring (F-PLC → PROFIsafe telegram → F-DI on CU or terminal STO (dual-channel) — E-grade supports both)
- IOP-2 panel (recommend 6SL3255-0AA10-0CA0 — much better than BOP-2 for commissioning/diagnostics)
- Optional: G120 PM240-2 / PM250 power modules (6SL3210-1PE…), IOP-2 (6SL3255-0AA10-0CA0), BOP-2 (6SL3255-0AA00-0CA0), line filters (6SL3200-0…), brake resistors, encoder module (for CU240E-2), STARTER/Startdrive license (basic commission free; advanced needs license)
Delivery Time
- Standard delivery: 3-5 working days (stock NOS)
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens SINAMICS CU units — not gray-market (firmware & PROFIsafe cert critical)
- Global supply network with competitive pricing on G120 CU/PM components
- Expertise in SINAMICS G120 modular system (CU240B/E selection, PM pairing, STARTER/Startdrive commission, PROFIsafe STO/SS1 wiring)
- Comprehensive technical documentation (CU-PM snap interface pic, terminal layout, Startdrive first-connect screenshot, B vs E comparison)
- Responsive customer service and support
Applications
- Conveyor / Pump / Fan (Basic): CU240B-2 DP + PM240-2 — simple V/f, Profibus existing network, cost-first.
- Machine Tools / Packaging / Converting (Enhanced): CU240E-2 PN + PM240-2 — Profinet RT/IRT, STO via PROFIsafe (SIL3), encoder feedback (add-on module) for speed loop, more I/O for clutch/brake.
- Retrofit old MICROMASTER / SIMOVERT: G120 (PM+CU) is the natural replacement — CU240B/E programs similar to MM4 parameter set (many params same numbering — easier migration).
- Safety-Critical Machinery: CU240E-2 with PROFIsafe STO/SS1 — guard interlocking, safe stop on door open — no separate safety relay needed (F-PLC upstream handles safety logic).
- Distributed Drive Architectures: Profinet daisy-chain (CU240E-2 PN 2× RJ45 switch) — up to 32 nodes on one Profinet line → PLC (S7-1500) → reduces cabling vs star.
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