... MODBUS, etc.. With double-polarity NPN and PNP type.. 6 digital input terminals, each of which can be used as user ... to input current (0~20 mA, 4~20 mA).. 1 digital output terminal, 1 multifunction relay output terminal and 2 analog ... (rpm), present output current, present output voltage, present linear-velocity, types of faults, and parameters for the system and operation; LED indicators ...