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Digital I/O digital input with pull-up disabled:
•
Digital input is triggered by an external switch or voltage between the digital
•
input pin and ground.
•
Example application, digital input without pull-up: occupancy sensor
connection:
+5.0 V
1k ohms
SW 2
CTL
SW 1
Figure 12.
Digital I/O Digital Input Application:
Occupancy Sensor, Without Pull-up
Room occupied: logic high, front panel LED (IPL EXP RIO8 only) is off.
Room unoccupied: logic low, front panel LED (IPL EXP RIO8 only) is lit.
Occupancy sensors typically supply +24 VDC when occupancy is
NOTE:
detected. After a set time with no occupancy, the sensor supplies 0 VDC.
IPL EXP I/O Series • Hardware Features and Installation
Digital
Control
I/O
Signal
Voltage
Protection
GND
Ground
Occupancy
Sensor
23
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