Led-Equipped Limit Switch - Panasonic FP0 User Manual

FP0
7.4.4

LED-Equipped Limit Switch

If the input of the FP0 does not turn OFF because of the leakage current from the
LED-equipped limit switch, the use of a bleeder resistor is recommended, as shown
below.
LED-equipped
limit switch
Internal circuit
r: Internal resistor of limit switch (k
R: Bleeder resistor (k
The OFF voltage of the FP0 input is 2.4 V, therefore when the power supply voltage is 24 V,
select R so that
the current will be greater than I =
The resistance R of the bleeder resistor is: R < or =
The wattage W of the resistor is: W =
In the actual selection, use a value that is 3 to 5 times the value of W.
Input
terminal
Bleeder
resistor
COM
)
Ω
)
Ω
24 - 2.4
r
13.44
5.6 × I − 2.4
(Power supply voltage)
R
7.4
FP0
(kΩ)
2
Wiring
Input Wiring
7 − 11