Analog interface

An analog interface is an electrical connection that forwards analog electric signals to downstream electric and electronic devices or components for further processing. Standardised analog interfaces (e. g. 0/4 - 20 mA and 0/2 - 10 V) are also referred to as standard signals.

Since current signals are not sensitive to electromagnetic interference (activation of adjacent consumers) and loss of voltage (due to line resistance), they are preferred over voltage signals. The maximum length of a signal cable for the power source is only limited by the maximum load.

The load is the load resistance of an electrical transducer/converter with current output signal, whereby the cable resistance defined by the cable cross-section must be taken into account.