Agrowtek VX12i Buku Petunjuk - Halaman 9

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Input Connections, Discrete Sensors (VX12i)

Discrete type sensors o er only an indication of "true" or "false" and no information in between. Typical

examples include liquid presense detection sensors, manual and proximity switches, door and window

switches, etc.

Passive Sensors

Passive sensors are simple, typically mechanical sensors that manipulate a physical switch (dry contact) to

close a circuit. Passive sensors do not have any electronics on board and simply pass through the signal

voltage when the condition is true. Passive sensors only require two wires; the signal voltage and the sensor

output.

Active Sensors

Active sensors have electronics on board and require both a power and ground wire to operate the sensor,

plus a third wire to carry the output signal of the sensor.

Active Discrete Sensor

Passive Discrete Sensor

(SXL Liquid Detection Sensor)

(Float Switch, Dry Contact)

GND

1. Active Sensor

Rquires three wires; V+, GND and signal output.

2. Passive Sensor

Requires two wires; V+ and signal output.