The power supply unit provides the system power
necessary for the bus system. The integrated choke
prevents the data telegrams from short-circuiting on
the bus line. The connection to the bus line is
established by clicking the device onto the DIN-rail
(installed data-rail) or by using the bus connection
terminal (red-black) on the front side. The power
supply unit NT640-4 can supply DC24V power from an
additional pair of terminals (yellow-white). This
DC24V output voltage is only allowed to power an
necessary for the bus system. The integrated choke
prevents the data telegrams from short-circuiting on
the bus line. The connection to the bus line is
established by clicking the device onto the DIN-rail
(installed data-rail) or by using the bus connection
terminal (red-black) on the front side. The power
supply unit NT640-4 can supply DC24V power from an
additional pair of terminals (yellow-white). This
DC24V output voltage is only allowed to power an