M1DL1 is a low cost and accurate (class1) active energy counter. It includes a 6 digits (5+1) electromechanical counter without reset for local display.
Standard SO type pulses, through a normally open free potential contact. Every close-down indicates a fixed value of energy (10 Wh). The link is done through an optocoupler and, consequently, the terminal is galvanic isolated.
It also includes a led lamp flashing 3200 times per kWh, which allows to check the operation of the device.