Level 1 is where all the controlling equipment lives. The main purpose of the devices in this level is to open valves, move actuators, start motors, and so on. Typically found in level 1 are PLCs, Variable Frequency Drives (VFDs), dedicated proportional-integral-derivative (PID) controllers, and so on. Although you could find a PLC in level 2, its function there is of supervisory nature instead of controlling.
Level 1 - Basic control
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