Panasonic FP0R - Precaution When Using LED-Equipped Reed Switch; Precaution When Using Two-Wire Type Sensor; Voltage Output Type; Wiring of Input and Output

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5.3 Wiring of Input and Output
5.3.1 Input Wiring
Connection of photoelectric sensor and proximity sensor
Relay output type NPN open collector output type
Voltage output type
Two-wire output type
Precaution when using LED-equipped reed switch
When a LED is connected in series to an input
contact such as LED-equipped reed switch,
make sure that the voltage applied to the PLC
input terminal is greater than the ON voltage. In
particular, take care when connecting a number
of switches in series.
Precaution when using two-wire type sensor
If the input of PLC does not turn off because of
leakage current from the two-wire type sensor
"photoelectric sensor or proximity sensor", the
use of a bleeder resistor is recommended, as
shown on the left.
The formula is based on an input impedance of
9.1 kΩ. The input impedance varies depending
on the input terminal number.