Output Wiring - Panasonic FPS Series User Manual

FPΣ User's Manual
In the actual selection, use a value that is 3 to 5 times the value of W.
Precaution when using an LED-equipped limit switch
If the input of the 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.
1
r
A LED-equipped limit switch
B FPΣ
Internal circuit
1
Power supply for input
2
The OFF voltage of the input is 2.4V. Therefore, when the power supply is 24V, select the
bleeder resistor R so that the current will be greater than the result of this formula:
24 - 2.4
I =
r
The resistance R of the bleeder resistor is:
13.44R
(kΩ)
R ≤
5.6I - 2.4
The wattage W of the resistor is:
2
(V)
W =
R
V = Power supply voltage
In the actual selection, use a value that is 3 to 5 times the value of W.

6.4.2 Output Wiring

Do not connect a load that exceeds the maximum switching ability of the output terminal.
To prevent the output circuits from being damaged by a short-circuit or other electrical
problems on the output side, transistors with short-circuit protection are provided (except for
Y0, Y1, Y3, and Y4 of the FPΣ CPU and FP0 expansion units).
4
3
R
COM
2
3
4
r
R
Bleeder resistor
Input terminal
Internal resistor of limit switch (kΩ)
Bleeder resistor (kΩ)
6.4 Input and Output Wiring
85