NAiS FP Series Hardware Manual

FP0 HardwareWiring
9-8 Matsushita Electric Works (Europe) AG
9.4.2 LED-Equipped Reed Switch
When a LED is connected to an input contact such as LED-equipped reed switch, make
sure that the ON voltage applied to the FP0 input circuit is greater than 19.2V DC.
In particular, take care when connecting a number of switches in series.
FP0
19.2V DC
or more
24V DC
LED-equipped
reed switch
COM
Input
terminal
9.4.3 Two-Wire Type Sensor
If the input of the FP0 does not turn OFF because of leakage current from the two-wire
type sensor, the use of a bleeder resistor is recommended, as shown below.
The OFF voltage of the FP0 input is 2.4V, therefore, select an R value so that the voltage between the
COM terminal and the input terminal will be less than 2.4V.
The impedance of the FP0 input terminal is 5.6kΩ.
The resistance R of the bleeder resistor is: R ≤
The wattage W of the resistor is:
In the actual selection, use a value that is 3 to 5 times the value of W.
13.44
(kΩ)
Two-wire
type sensor
FP0
5.6 × I – 2.4
COM
Input terminal
Internal
circuit
Bleeder
resistor
I: Sensor’s leakage current (mA)
R: Bleeder resistor (kW)
(Power supply voltage)
2
R
W =
9.4.4 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.

NAiS FP Series Specifications

General

Brand	NAiS
Model	FP Series
Category	Controller
Language	English