Mitsubishi Electric MELSEC-F FX3G Series User Manual page 152

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
3. In the case of input device with built-in parallel resistance
Use a device having a parallel resistance, Rp (k ), of 15k or more.
If the resistance is less than 15k , connect a bleeder resistance, Rb (k ), obtained by the following formula
as shown in the following figure.
Rb (k )
15-Rp
PLC
(sink input)
*1 In the case of a type only for sink input,
connect the device to the COM terminal.
4. In the case of 2-wire proximity switch
Use a two-wire proximity switch whose leakage current, I is 1.5 mA or less when the switch is off.
When the current is larger than 1.5mA, connect a bleeder resistance, Rb (k ), determined by the following
formula as shown in the following figure.
Rb (k )
I -1.5
PLC
(sink input)
*1 In the case of a type only for sink input,
connect the device to the COM terminal.
146
4Rp
24V
Bleeder
resistance
S/S
Rb
X
15k or
Rp
more
0V
*1
6
Bleeder
24V
resistance
2-wire
S/S
Rb proximity
I sensor
X
0V
*1
10.2 24V DC input (Sink and source input type)
0V
S/S
PLC
X
(source input)
24V
0V
S/S
I
PLC
X
(source input)
24V
10 Input Wiring Procedures
Bleeder
resistance
Rb
15k or
Rp
more
Bleeder
resistance
2-wire
Rb proximity
sensor