NAiS FP Series User Manual

FPΣ
Installation and Wiring
5-14
Precaution when using LED-equipped limit switch
If the input of PLC 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.
r: Internal resistor of limit switch (kΩ)
LED-
equipped
limit switch
Bleeder
resistor
COM
Input terminal
Internal circuit
R
Power supply for input
r
FPΣ
Figure 45: FPΣ Precaution when using LED-equipped limit switch
The off voltage of input is 2.4 V, therefore when the power supply voltage is 24 V, select the
bleeder resistor “R” so that
the current will be greater than I =
The resistance R of the bleeder resistor is: R
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.
13.44
5.6 x I - 2.4
(kΩ)
24 - 2.4
r
(Power supply voltage)
2
R

NAiS FP Series Specifications

General

Brand	NAiS
Model	FP Series
Category	Controller
Language	English