Modern evolutions of PLCs that combine the ruggedness of a PLC with the high-level programming capabilities of a PC, handling both discrete control and continuous process control.
Imagine a heat exchanger that must keep water at 80°C.
This is the classic "seal-in" or "latching" circuit.
, Bolton’s guide is your best friend. It’s concise, well-illustrated, and—most importantly—practical. Pro-tip for Students: