Specification Review
plc control system design
Resolve plc control system design questions before selecting a supplier: what evidence exists, what design input the factories must share, what each supplier answers, and which deviations remain open. This page is a procurement dossier, not an engineering stamp, ESG statement or carbon claim.
Decision dossier
Questions to resolve
| Decision point | Evidence or question |
|---|---|
| Questions to resolve: Design input | Who owns the I/O list and sequence narrative? Which loops are ordinary process control and which, if any, are burner management? What digital I/O count, analog mix, pulse frequency in kHz and 24 VDC or VAC supply are frozen? What FAT/SAT matrix will both sides sign? |
| Supplier answer | Module allocation, spare capacity, network devices, software licenses, firmware versions, commented source files, backup media and whether SAT hours are inside the price. A Micro850-class table is a reference envelope, not the answer unless the factory names that hardware in writing. |
| Open deviation | Any bidder pricing a CPU only while another prices a documented cabinet with restore procedure. Any offer that folds flame-safety into a standard PLC without a listed architecture. Any quote that omits tooling, installation, shipping, training or commissioning without saying they are extra. |
Trade-offs that stay on the dossier: single cabinet versus an integrated line with existing DCS; catalog scan time versus validated output on buyer instruments; machine price versus installed project cost including SAT. Limitations: no certificate from this desk covers the whole island; 2011 burner-manual text is historical; missing drawings mean quotes stay assumption-bound. Those sentences are selection filters for plc control system design, not marketing claims.