Mitsubishi Electric MELSEC iQ-F Series User Manual page 183

■When the input signal cannot be received because the current is insufficient
The rated input current is 4mA for the FX5S CPU module in X10 or more, FX5UJ CPU module in X10 or more, FX5U CPU
module in X20 or more, and I/O module.
In some cases, depending on extension devices used, it may not be possible to receive the input signal, due to the insufficient
current. Take the following action in such case.
Input current adjusted
according to the connection
device
Programmable controller
5.6kΩ
X
S/S
External resistance
(for input current adjustment)
■When capturing high-speed pulses
When capturing pulses of a response frequency of 50kHz to 200kHz
follows.
• The wiring length should be 5m or less.
• Use shielded twisted-pair cables for connection cables. Ground the shield of each shielded cable only on the CPU module
side.
• Connect a 1.5k (1W 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 20mA or more.
*1 FX5S/FX5UJ CPU module: 50k to 100kHz
*2 FX5S/FX5UJ CPU module: Inputs X0 to X4
FX5U-32M and FX5UC-32M: Inputs X0 to X5
High speed pulse input/output module: Inputs X to X+5
The above-mentioned restrictions differ depending on the specifications of the connecting device (for example, encoder)
Please adjust the cable length and load, for connecting device.
Proximity sensor
*1 *2
by using inputs X0 to X7 , wire the terminals as
13 WIRING
181
13.5 Input Wiring
13