Mitsubishi MELSEC iQ-F FX5UC, User Manual

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6 WIRING
6.5 Input Wiring
■
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.
If the resistance is larger than leakage current, I

of 1.5 mA, connect a bleeder resistance Rb (k
Ω
), obtained by the following
formula as shown in the following figure.
• Wiring example of FX5UC-32MT/D
• Wiring example of FX5UC-32MT/DSS
When a high-speed pulse is captured
When capturing pulses of a response frequency of 50 to 200 kHz on input X0 to X7 (FX5UC-32M  and High-speed pulse
input/output module is X0 to X5) wire the terminals as stated below.
• The wire length should be 5 m or less.
• Use shielded twisted-pair cables for connecting cables. Ground the shield of each shielded cable only on the CPU module
side.
• Connect a 1.5 k
Ω
(1 W or more) bleeder resistance to the input terminal, so that the sum of the load current of the open
collector transistor output on the mating device and the input current of the CPU module is 20 mA or more.
The above-mentioned restrictions are due to specifications of connecting device (encoder etc.). Please adjust the cable length
and load, for connecting device.
Item Specifications
Bleeder resistance Rb (k
Ω
) FX5UC-32MT/  X0 to X5 7 / (I

-1.5) or less
FX5UC-64MT/  ,
FX5UC-96MT/ 
X0 to X7
High-speed pulse input/output module X0 to X5
FX5UC-32MT/  X6 to X17 7 / (I

-1.5) or less
FX5UC-64MT/  ,
FX5UC-96MT/ 
X10 to X17
High-speed pulse input/output module X6, X7
FX5UC-64MT/  ,
FX5UC-96MT/ 
X20 and
subsequent 9 / (I  -1.5) or less
Input module, Input/output module, Powered input/output module
X
COM
+24 V
Rb

FX5UC-32MT/D
Bleeder
resistance
2-wire
sensor
X
Rb
24 V DC
Fuse
• Sink input wiring
COM

FX5UC-32MT/DSS
2-wire
sensor
Bleeder
resistance
X
Rb
24 V DC
Fuse
• Source input wiring
COM

FX5UC-32MT/DSS
Bleeder
resistance
2-wire
sensor