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Sinking and sourcing
which way the current goes
Step 1
+24 V DC
0 V (DC −)
24 V
supply
+
−
Three-wire DC sensor
brown, +V
blue, 0 V
sensing
circuit
PNP. The output transistor connects the black wire to +V.
Target absent, output open.
black, output
lamp A
output to 0 V
lamp B
+24 V to output
1756-IB16
DC input, 16 points
IN-0
LED
conducts downward
GND-0
to DC COM −
input bit = 0
Output stage of the sensor
Target
Position of the lamp
Input module
Output contact sense
Output transistor
—
Current in the control wire
none
Lamp
dark
Input bit
—
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