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9 Input Wiring Procedures
9.2 24 V DC input (Sink and source input type)
78
FX3S 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 Subsection 9.2.2.
9.2.2 Instructions for connecting input devices
1. In the case of no-voltage contact
The input current of this PLC is 7 mA/24 V DC. (5 mA/24 V 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. 4 V or less.
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 X017
Input signal voltage
AC power type: 24 V DC 10 %
DC power type: 20.4 V to 26.4 V DC
Input signal current 7 mA 5 mA
Input sensitivity current
ON 4.5 mA or more 3.5 mA or more
OFF 1.5 mA or less
Input number Input current
X000 to X007 7 mA/24 V DC
X010 to X017 5 mA/24 V 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
(Sink input)
X
0V
LED
24V
S/S
PLC
(Source input)
X
0V
LED
24V
S/S