
IPL EXP I/O Series • Hardware Features and Installation
23
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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:
Control
Signal
Ground
+5.0 V
1k ohms
SW 2
SW 1
Digital
I/O
GND
Voltage
Protection
CTL
Occupancy
Sensor
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.
NOTE:
Occupancy sensors typically 24 VDC when occupancy is
detected. After a set time with no occupancy, the sensor supplies 0 VDC.
Содержание IP Link IPL EXP 200
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