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-ACC" represents a voltage control with four switches in an "H" bridge. The system can control de frequency, the polarity, the amplitude, etc. The different switches and pushbuttons emulate the function mode selected.