the logical link between functional groups schaltungsanordnung

摘要

The logic circuit connects functional units together. Each functional unit (1-3) can be switched to two supply voltages symmetric about a reference potential via a changeover switch (11). The switch is controlled from a logic device (21) and the shared output is connected to a resistor (12). The positive supply voltage represents logic level '1' and the negative supply voltage, logic level '0'. The absence of a supply voltage or a reference potential at the output of the changeover switch indicates that the functional unit is switched off or that it has failed.