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10 Input Wiring Procedures
10.2 24V DC input (Sink and source input type)
144
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
3. Input sensitivity
The PLC input current and input sensitivity are shown in the following table.
When there is a series diode or resistance at the input contact or there is a parallel resistance or leakage
current at the input contact, wire the terminals in accordance with the following table.
→ For the instructions for connecting input devices, refer to Subsection 10.2.2.
10.2.2 Instructions for connecting input devices
1. In the case of no-voltage contact
The input current of this PLC is 7mA/24V DC. (5mA/24V DC in X010 or later)
Use input devices applicable to this minute current.
If no-voltage contacts (switches) for large current are used, contact failure may occur.
<Example> Products of OMRON
2. In the case of input device with built-in series diode
The voltage drop of the series diode should be approx. 4V or less.
For example, when lead switches with a series LED are used, up to two switches can be connected in series.
Also make sure that the input current is over the input-sensing level while the switches are ON.
Item X000 to X007 X010 to max input number of the main unit
Input voltage AC power supply type: 24V DC 10% DC power supply type: 20.4V to 28.8V DC
Input current 7mA 5mA
Input sensitivity current
ON 4.5mA or more 3.5mA or more
OFF 1.5mA or less 1.5mA or less
Input number Input current
X000 to X007 7mA/24V DC
X010 or more 5mA/24V DC
Type Model name Type Model name
Microswitch Models Z, V and D2RV Operation switch Model A3P
Proximity switch Model TL Photoelectric switch Model E3S
PLC
(source input)
X
24V
LED
*1 In the case of a type only for sink input,
connect the device to the COM terminal.
PLC
(sink input)
X
0V
LED
*1
24V
S/S S/S
0V