Choosing the right PLC is about balancing today's needs with room for tomorrow's expansion. The criteria below clarify the decision.
Core selection criteria
- I/O count and type — digital/analog I/O needs + 20% spare
- Scan speed — low scan time for fast processes (packaging, motion)
- Communication — PROFINET, EtherCAT, Modbus or EtherNet/IP support
- Expansion — modular design, additional I/O and special modules
- Ecosystem — engineering software, local support, spare-part availability
A compact PLC is ideal for small, fixed applications; if the machine will grow, a modular design is more economical long-term.
Common mistakes
- Sizing I/O exactly at the limit (no spare)
- Ignoring the existing plant's communication protocol
- Not assessing spare-part and local-support availability
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