Advantech ADAM-4051-BEProduct Attribute Attribute Value Number of I O Ports 16 Series ADAM 4000 Series Supply Voltage 24 VDC Overview The ADAM 4051 is a 16 ch. Digital Input Module, built with 2500 VDC optical isolation, suitable for critical applications. Different from other modules, the ADAM 4051 accepts 10~50V input voltage to fit various digital signals, such as 12 VDC, 24 VDC, 48 VDC. Moreover, users can read the current status from the LED indications on the front