Section
Category: Control
Drives, PLCs, I/O, and HMIs for machines that have to start, vary speed, and be serviced.
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PLC, I/O, and HMI: a practical split for a small machine
The PLC runs the logic. I/O touches the sensors and actuators. The HMI is the screen the operator uses. One catalog number rarely does all three well.
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VFD, soft starter, or servo: three different motor problems
A soft starter only eases the start. A VFD changes speed. A servo holds position or velocity with feedback. Buying the wrong one wastes the panel.