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9 Input Wiring Procedures

9.2 24 V DC input (Sink and source input type)

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

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)

LED

24V

S/S

PLC
(Source input)

LED

24V

S/S