Wiring Of Input And Output - Panasonic FP-X0 L14R User Manual

5.4 Wiring of Input and Output

5.4.1 Input Wiring
Connection of photoelectric sensor and proximity sensor
Relay output type
Voltage output type
Precaution when using LED-equipped lead switch
Precaution when using two-wire type sensor
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NPN open collector output type
Two-wire output type
When a LED is connected in series to an input
contact such as LED-equipped lead switch, make
sure that the on voltage applied to the PLC input
terminal is greater than 21.6V DC. In particular,
take care when connecting a number of switches
in series.
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
below.
The formula is based on an input impedance of
5.6kΩ. The input impedance varies depending on
the input terminal number.