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B-16
3 Wiring
3.4 Analog Input Line
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
3.4 Analog Input Line
The analog input type, "voltage input "or "current input", can be selected for each channel.
3.4.1 FX3U-4AD
*1. For FX3G/FX3U Series PLC (AC power type), the 24V DC service power supply is also available.
*2. The [FG] terminal and the [ ] terminal are connected internally.
There is no “FG” terminal for ch1. When using ch1, connect directly to the [ ] terminal.
*3. Use a 2-core twisted shield wire for analog input line, and separate it from other power lines or
inductive lines.
*4. For the current input, short-circuit the [V+] terminal and the [I+] terminal.
*5. If there is voltage ripple in the input voltage or there is noise in the external wiring, connect a capacitor
of approximately 0.1 to 0.47μF 25 V.
ch
:
represents the channel number.
250
Ω
6.8k
Ω
ch
200k
Ω
FX
3U
-4AD
*3
24V DC
+15V
If current input is
selected
If voltage input is
selected
*4
External power supply
wiring
*1
I+
VI-
V+
FG
24+
24-
ch
ch
*3
-15V
Class-D grounding
*2
*2
*5
250
Ω
200k
Ω
I+
VI-
V+
FG
*2
6.8k
Ω
ch