Make the technical decision.
Then release the project basis.

Lay out the actual equipment with clearances, ducts, terminals, cable bends, cooling hardware, door devices and spare capacity; then release both the usable mounting area and external dimensions.

Choose from the real dust, water, cleaning and condensation exposure, then review every gland, vent and door cut-out as part of the completed assembly.

Choose from logic performance, I/O distribution, motion, safety, networks, software environment and future expansion—not CPU price or I/O count alone.

Not without checking article numbers, dimensions, wiring, modules, firmware, TIA Portal version, communications, program functions and the shutdown test plan.

Motor current, load duty, overload, braking, control performance, communication, safety, EMC, environment and accessories decide the complete drive configuration.

Use a soft starter for suitable fixed-speed duty where controlled starting or stopping is the goal; evaluate a VFD when normal operation needs speed or broader torque control.

Prepare the load and I/O lists, supply, environment, operating modes, interfaces, destination requirements, documents and FAT expectations.

FAT should verify the released design, materials, workmanship, agreed electrical checks and simulated functions while clearly separating site wiring, loads, process and safety validation.

Release the device and port list, physical topology, traffic, copper or fiber media, availability, diagnostics, naming and security ownership before choosing the switch BOM.