Choose the hardware.
Define the complete system.

Start with I/O count, program complexity, motion and safety functions, network interfaces, environmental conditions and future expansion. S7-1200 / G2 is commonly considered for compact machines, while S7-1500 is evaluated for higher performance, larger architectures and advanced functions. The final CPU and modules must be confirmed as one compatible system.

Send the full article number from the device label, including every letter, number and suffix, plus firmware or hardware version when visible. A family name such as G120 or S7-1500 is not enough because it can represent many electrical ratings, interfaces and lifecycle states.

Yes. A useful BOM review checks exact article numbers, quantities, generation compatibility, required accessories, obvious gaps and lifecycle status. Technical assumptions and substitutions should be shown separately before the commercial offer is approved.

Sometimes the physical and electrical interfaces are close, but CPU behavior, I/O modules, memory, communication, software version and safety functions can still change. A migration review should map hardware, source projects, networks, wiring and acceptance tests before shutdown.

Provide the full old and proposed article numbers, mounting cut-out, screen size, PLC protocol, existing project backup, engineering software version and required functions. Hardware availability alone does not prove that the old HMI project will convert without engineering work.

Compare input supply, motor current, overload duty, control method, I/O, fieldbus, braking, EMC accessories, enclosure losses, cable length and parameter backup. The new drive must be validated against the driven load—not selected only by matching kW.

Use a soft starter when the motor normally runs at fixed speed and the main objective is a controlled start or stop. Evaluate a VFD when variable speed, process control, energy optimization or wider torque control is required. Load torque, starts per hour, bypass and harmonic considerations affect the final decision.

V20 is typically evaluated for straightforward basic-performance applications. G120 is considered when modular configuration, broader communication, safety functions or a more demanding application architecture is needed. Ratings and options must be checked by exact article number.

Distributed I/O becomes useful when signals are physically spread across a machine or plant and shorter field wiring, modular expansion or remote diagnostics improve the architecture. Network availability, cabinet locations, environment, fail behavior and maintenance access should be reviewed first.

It should identify the legal supplier, exact article numbers, quantities, included accessories, technical assumptions, lifecycle or substitution notes, lead-time basis, Incoterm, destination, packing, documents, warranty basis and exclusions. Engineered panels also need an agreed drawing and test scope.

The project can define an approved BOM, general arrangement, schematics, terminal plan, parameter schedule, FAT record, as-built package, packing list and agreed commercial export documents. Certification or a standard claim is included only when explicitly supported by the contracted scope.

Honghao records the full article number, confirms the quoted configuration against current manufacturer information and separates approved substitutions from the original BOM. Manufacturer authorization, certificates or special traceability are never implied; they must be documented when required.