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Unformatted text preview: ith parallel connection of proximity sensors in two-wire technology, the following
points must be observed:
• Because the sum of all possible quiescent currents of parallel connected
proximity sensors flows via the load in the unswitched status, steps must be
taken to ensure that this does not lead to a malfunction of controllers connected
• If a proximity sensor has switched through, then it "withdraws" the supply
voltage from the other parallel connected proximity sensors. This has the effect,
that the remaining proximity sensors can no longer indicate their actual
switching status. If the first proximity sensor now returns to its unswitched
status, then a second already activated proximity sensor can only indicate its
switching status correctly after the ready delay time of the actual proximity
sensor. This can lead to incorrect signals.
• Parallel connection is not possible with NAMUR-technology. + 24 V DC
BN(1) BN(1) BU(3) BU(3) L 0V
Load (L) Fig. 10.3.1: Parallel connection in two-wir...
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- Spring '12