Application Scenarios
In a flexible-packaging plant running a 12-axis rotogravure press, the original controls paired an S7-1515 PLC (handling sequencing) with three standalone motion cards on PCI slots — a brittle architecture where firmware mismatches between the PLC and motion cards caused sync drift every time the S7 had a patch update. The retrofit swapped the motion-card jungle for a single Siemens 6AU1240-1AB00-0AA0 C240 PN. The C240’s 18 onboard DI picked up all web-break sensors and register marks directly (no remote I/O blocks needed for machine-level signals), the 4 encoder inputs locked onto the impression-cylinder and infeed measuring wheels at 1 MHz RS-422, and the DRIVE-CLiQ trunk chained eight S120 CU320-2 nodes driving the print decks, infeed, and outfeed servos. Because the 6AU1240-1AB00-0AA0 runs the SIMOTION kernel with MCC (Motion Control Chart) programming, the cam and electronic-gear tables that previously lived in cryptic vendor DLLs became visible ladder-style logic that the plant’s own automation techs could edit. Register drift between decks dropped from ±0.8 mm to ±0.12 mm at 300 m/min, and the “motion card PCI conflict” ticket disappeared from the maintenance backlog entirely.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 6AU1240-1AB00-0AA0 |
| Manufacturer | Siemens AG (SIMOTION C-series) |
| Product Category | Programmable Motion Controller (PC-based, fanless) |
| Supply Voltage | 24 V DC (20.4 … 28.8 V DC) |
| Onboard Digital Inputs | 18 DI (machine-level, low-latency) |
| Onboard Digital Outputs | 8 DO (0.5 A/ch typ., short-circuit protected) |
| Encoder Inputs | 4 × RS-422, 5 V, up to 1 MHz, incremental or SSI absolute |
| Drive Interface | DRIVE-CLiQ (chains to SINAMICS S120 CU320-2 / PM340 / ALM) |
| Field Bus — PROFINET | Yes, 3-port switch, IRT + RT, IO Controller / Device |
| Field Bus — PROFIBUS DP | Yes (via IsoPROFIBUS expansion board, dual-port) |
| Max. Axes (typical) | Scales with S120 CU320-2 slaves on DRIVE-CLiQ (>> 8-axis D410-2 cap) |
| Programming | SIMOTION SCOUT / TIA Portal + SIMOTION option; MCC, LAD, FBD, ST |
| Tech Functions | POS (positioning), GEAR (e-gear), CAM (electronic cam), PATH (interpolation) |
| Memory | RAM 122 MB + 20 MB Java RAM; retentive 108 kB; CFast user storage ~1.5 GB |
| Firmware Baseline | V4.1 SP2 HF3+; current service V5.4+ / V5.5 SP1+ recommended |
Technical Principles and Innovative Values
Innovation Point 1: C-series “Box PC” Philosophy vs. D-series “Snap-On”. The 6AU1240-1AB00-0AA0 is a standalone DIN-rail / panel-mount box with its own industrial motherboard, not a mezzanine that clips onto a PM340 power module like the D410-2. This means you can hang it over a distributed S120 drive lineup or mount it in the machine’s local cabinet independent of the drive stack — critical when the drives live in a hot VFD room but the motion controller needs to sit next to the encoder and cam sensors on the machine frame.
Innovation Point 2: MCC (Motion Control Chart) — Ladder for Motion. Instead of writing cam tables in C or tweaking vendor function blocks, the 6AU1240-1AB00-0AA0 lets engineers draw motion sequences as graphic charts: “wait for home → accelerate to 2000 rpm → engage gear ratio 3.7:1 → dwell 120° → decel.” The four canonical SIMOTION tech functions — POS, GEAR, CAM, PATH — cover 90% of converting / printing / web-handling machines without custom code.
Innovation Point 3: Dual-Bus Pragmatism (PROFINET + PROFIBUS). The C240 PN’s “PN” suffix isn’t cosmetic — the onboard 3-port PROFINET IRT switch talks to S7-1500/1200 plant PLCs and HMIs at ≤250 µs cycle, while the IsoPROFIBUS expansion card (two ports) keeps legacy S120 CU310-2 DP nodes or third-party drives alive during a phased migration. One 6AU1240-1AB00-0AA0 can thus bridge a “mostly PROFINET” plant and a “still PROFIBUS” drive cellar.
Innovation Point 4: DRIVE-CLiQ Native. All S120 components (CU320-2, PM240-2, PM340, Active Line Modules) auto-enumerate over DRIVE-CLiQ when chained from the 6AU1240-1AB00-0AA0. Drive parameters, encoder feedback, and power-stack faults land in the SIMOTION diagnosis buffer automatically — no mapping GSD files, no “why is the torque word offset by two bytes” debugging.
Innovation Point 5: Fanless, 24 V, Machine-Room Tough. No rotating fans = no filter maintenance in dusty converting halls. The 6AU1240-1AB00-0AA0 runs on 24 V DC (shared with the cabinet’s S7 supply), tolerates 60 °C ambient in the panel, and the CFast card keeps the OS + project + retentive data through power cycles. For OEMs shipping machines to global sites, this “no fans, one supply rail” design removes two common commissioning headaches.
h2 Application Cases and Industry Value
A tissue-converting line OEM in Southern Europe was rebuilding their 10-axis unwind/perforate/rewind stack for a major FMCG customer. Original design used an S7-1516 + 1512SP + three TM54F technology modules for the cam-synchronized rotary knife — functional, but the 1516’s Technology Object cycle (4 ms) couldn’t hold <0.3 mm cut-to-register at 600 sheets/min without the knife servo occasionally “hunting” at changeover. The rebuild replaced the 1516+TM54F combo with a 6AU1240-1AB00-0AA0 C240 PN as the motion master, keeping an S7-1200 just for line-level MES handshake over PROFINET. The C240’s 0.5 ms minimum servo/interpolator cycle (vs. 4 ms on the S7-1500 Tech Obj) tightened cut scatter to ±0.09 mm, and the CAM chart let the OEM’s field service techs tweak lead-in/out angles on-site through SCOUT without rebuilding the PLC project. The commercial win: the S7-1200 + C240 combo BOM was ~12% cheaper than the original 1516+1512SP+TM54F stack, and spare-parts inventory simplified because the also served their 6-axis turret-winder SKU.
