FP
Σ
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 (k
Ω
)
LED-
equipped
limit switch
Bleeder
resistor
COM
Input terminal
Internal circuit
R
Power supply for input
r
FP
Σ
Figure 45: FP
Σ
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
(k
Ω
)
24 - 2.4
r
(Power supply voltage)
2
R
Summary of Contents for FP Series
Page 15: ...FP Functions and Restrictions of the Unit 1 2...
Page 25: ...FP Specifications and Functions of Control Unit 2 2...
Page 37: ...FP Expansion 3 2...
Page 44: ...Chapter 4 I O Allocation 4 1 I O Allocation 4 3...
Page 45: ...FP I O Allocation 4 2...
Page 51: ...FP Installation and Wiring 5 2...
Page 77: ...FP High speed Counter and Pulse Output Functions 6 2...
Page 133: ...FP High speed Counter and Pulse Output Functions 6 58...
Page 135: ...FP Communication Cassette 7 2...
Page 147: ...FP Communication Function 1 Computer Link 8 2...
Page 169: ...FP Communication Function 2 General purpose Serial Communication 9 2...
Page 205: ...FP Communication Function 2 General purpose Serial Communication 9 38...
Page 207: ...FP Communication Function 3 PLC Link Function 10 2...
Page 232: ...Chapter 11 Other Functions 11 1 Analog Potentiometer 11 3 11 2 Clock Calendar Function 11 4...
Page 233: ...FP Other Functions 11 2...
Page 239: ...FP Self Diagnostic and Troubleshooting 12 2...
Page 249: ...FP Self Diagnostic and Troubleshooting 12 12...
Page 251: ...FP Specifications 13 2...
Page 323: ...Index FP I 4...
Page 325: ...FP Record of changes R 2...