Digital amplifier for proportional valves in the open ring The EDM-M* card is a digital amplifier for the open ring control of proportional valves, for assembly on DIN EN 50022 guides. The card provides a current to the solenoid proportional to the reference signal and independent to the variations in temperature and the load impedance. 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. The reference signal is analogue in tension or current. Each version is available with different maximum current calibrations and Switching frequency (PWM), optimized according to the type of valve to be controlled. The front panel houses the LEDs for diagnostics and operation of the card and a micro-USB port for connection to the EDM40-Smartmanager software for diagnostic and/or configuration, downloadable from this page under 'download' this product replaces the out of production cards EDM-M* series 31 with reference signal in current or in tension.