FP
Σ
User's Manual
6.4 Input and Output Wiring
85
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.
COM
1
2
3
4
R
r
A
LED-equipped limit switch
3
Bleeder resistor
B
FP
Σ
4
Input terminal
1
Internal circuit
r
Internal resistor of limit switch (k
Ω
)
2
Power supply for input
R
Bleeder resistor (k
Ω
)
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:
I =
24 - 2.4
r
The resistance R of the bleeder resistor is:
(k
Ω
)
13.44R
5.6I - 2.4
R ≤
The wattage W of the resistor is:
(V)
2
R
W =
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 FP
Σ
CPU and FP0 expansion units).
Содержание FPS Series
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Страница 47: ...CPU Types FP User s Manual 30 LD Body...
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Страница 58: ...Chapter 4 Expansion...
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Страница 82: ...Chapter 6 Installation and Wiring...
Страница 104: ...FP User s Manual 6 4 Input and Output Wiring 87 A FP 1 Output terminal 2 Load 3 Inductor COM 2 1 3...
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Страница 116: ...Chapter 7 High Speed Counter and Pulse Output...
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Страница 170: ...Chapter 8 Communication...
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Страница 236: ...FP User s Manual 8 6 Program Controlled Communication 219 POU Header LD Body 1 2...
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Страница 278: ...Chapter 11 Troubleshooting...
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