The "N-EM" are a series of emulators that provide the students the required hardware to emulate the most common automatic systems.
The "N-EM" modules are designed to work with the "AE-PLC" units to obtain the fundamental knowledge of PLC programing, PLC management, etc.
"N-EM-TC" represents a coal treatment system used to get a desired coal mix from three different coal type storages. The coal treatment system controls the amount of coal type spilled by each tank. The different switches and pushbuttons emulate the coal tank level sensors, the valve of each tanks, the state of the doors, etc.