Bill of Materials (BOM)
A Bill of Materials (BOM) in industrial machine design is the complete, hierarchical list of every component, sub-assembly, and raw material required to build and commission a machine — including electrical, pneumatic, mechanical, and software elements. In automation, a BOM is not just a parts list: each line item reflects a design decision based on load, voltage range, ambient conditions, and cross-component compatibility.
- Packaging machines: BOM covers servo drives, SMPS rails, pneumatic cylinders, proximity sensors, and HMI — often 200–800 line items per machine.
- Assembly SPMs: Multi-station machines where each station has its own sub-BOM feeding a master document. Version control is critical.
- Conveyor systems: BOM must differentiate between field instruments (encoders, photo eyes) and panel components (relays, MCBs, terminal blocks).
- Test and inspection rigs: Vision cameras, lighting controllers, and DAQ boards appear alongside standard PLC and drive hardware.
Inputs to a BOM include the machine functional spec, motion profile, cycle time, supply voltage (400V AC / 24V DC), ambient temperature, IP rating, and the applicable regulatory standard (CE, UL, IS). Outputs are itemised parts lists with manufacturer part numbers, quantities, datasheet references, and procurement lead times — consumed by procurement, panel builders, and commissioning engineers. Engineers must track power budget (24V DC consumer sum vs. SMPS rated current), PLC I/O count across digital, analog, and safety channels separately, cabinet thermal load against cooling capacity, and cable derating at ambient temperatures above 40°C.
- Under-specifying SMPS by selecting rated current at 100% load — no headroom for inrush and future I/O expansion.
- Copying a BOM from a previous project without checking voltage compatibility when mixing 24V DC field devices with 230V AC control circuits.
- Omitting soft starters or circuit breakers from early-stage BOMs, then discovering upstream panel layout conflicts during detailed engineering.
- Not locking component variants by revision — procurement buys an alternate part with a slightly different pinout, commissioning team discovers on-site.
- Confusing 'quantity per machine' vs. 'quantity per station' in multi-station SPMs, leading to under-ordering.
Engineer inputs machine parameters — axis count, sensor types, power supply, ambient temp, target standard — into ClusterVise in under 10 minutes. The platform generates a structured BOM with manufacturer part numbers, quantities, and datasheet links in under 2 hours versus 2–4 days manually. SMPS sizing is calculated automatically from the declared 24V DC consumer list with 20% headroom applied by default. The BOM is version-controlled and exportable to Excel, PDF, or ERP-ready CSV with no copy-paste errors. Each row shows the engineering rule that drove the component selection.
| Component | Selection | Qty | Basis |
|---|---|---|---|
| PLC CPU | Siemens S7-1215C DC/DC/DC | 1 | 68 DI/DO, 2 AI required |
| Servo Drive | Sinamics V90 400V 1kW | 4 | Per axis, 0.75kW peak load |
| SMPS 24V DC | Phoenix QUINT 20A | 2 | Total load 16.4A + 20% margin |
| Safety Relay | Pilz PNOZ X3 | 1 | E-stop + guard door circuit |
| Proximity Sensor | Sick IME12-04BPSZC2S | 12 | Position detect, IP67 |
| Tower Lamp | Patlite LR5-3PQJBW-RYG | 1 | 3-zone, 24V DC |
