Digital amplifier for proportional valves in the open ring in Io-Link, Edm-M1, Edm-M2 and EDM-M3 cards are digital amplifiers for the open ring control of proportional valves in Io-Link networks. Assembly on GUIDE DIN EN 50022 It is available in three versions, for the command of a monosolenoid valve (M1), or a double solenoid (M2) or two monosolenid valves (M3) through two independent channels. Each version is available with different maximum current calibrations and Switching frequency (PWM), optimized according to the type of valve to be controlled. The reference signal is digital, via Io-Link. Temperature and hours of operation are monitoring by bus. The front panel houses the LEDs for diagnostics and operation of the card and a micro-USB port for connecting to EBC software for diagnostics. The configuration takes place through Master I-Link.