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Unformatted text preview: Didactic GmbH & Co. KG • FP 1110 141 10. Connection and circuit technology A potential protective grounding terminal is identified by green-yellow.
In the case of designs for AC or AC/DC (universal current), the connection cables may
be identified in any colour other than green-yellow. Generally, however brown or
blue is selected, as for direct current designs.
Voltage supply e.g.: 15 – 250 V DC
20 – 250 V AC In the case of two-wire sensors it should be noted that in the unactuated status, a
residual current must flow to provide a current supply for the proximity sensor. The
residual current also flows via the load. In the acknowledged status, a minimum load
current must flow to guarantee the reliable operation of the proximity sensor. 142 © Festo Didactic GmbH & Co. KG • FP 1110 10. Connection and circuit technology 10.1.2 Three-wire DC technology
Proximity sensors in three-wire technology have three connecting wires. As a rule,
the colours of the connecting wires comply with European standard EN 50 044. Two
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