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10 Input Wiring Procedures
10.2 24V DC input (Sink and source input type)
143
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Input/Output
Nos., Unit Nos.
8
Installation
9
Preparation and
Power Supply
Wiring
10
Input Wiring
10.2 24V DC input (Sink and source input type)
This section explains handling of 24V DC inputs in the main unit, precautions on input device connection, and
external wiring examples.
→ For the input specifications, refer to Section 4.3
10.2.1 Handling of 24V DC input
1. Input terminals
Sink input
When a no-voltage contact or NPN open collector transistor
output is connected between an input (X) terminal and the 0V
terminal and the circuit is closed, the input (X) turns on.
Then, the input display LED lights.
Source input
When a no-voltage contact or PNP open collector transistor
output is connected between an input (X) terminal and the 24V
terminal and the circuit is closed, the input (X) turns on.
Then, the input display LED lights.
RUN terminal setting
X000 to X017 (up to the largest input number in the main unit
*1
) of the main unit can be used as RUN input
terminals by setting parameters.
*1. X000 to X007 in the FX
3G-14M main unit, and X000 to X015 in the FX3G-24M main unit
→ For the functions of the RUN terminals, refer to Subsection 14.2.1.
2. Input circuit
Function of input circuit
The primary and secondary circuits for input are insulated with a photocoupler, and the second circuit is
provided with a C-R filter.
The C-R filter is designed to prevent malfunctions caused by chattering of the input contact and noise from
the input line.
There is a delay of approx. 10ms in response to input-switching from ON to OFF and from OFF to ON.
Change of filter time
X000 to X007 have digital filters, and the filter time can be changed in increments of 1ms in the range from 0
to 15ms through special data register (D8020). When 0 is specified for the time, the input filter values are set
as shown in the following table.
Input number Input filter value when 0 is specified
X000, X001, X003, X004 10 s
X002, X005, X006, X007 50 s
X000
X001
X007
*
* Input impedance
S/S
N
L
100 to 240V AC
Fuse
24V
0V
X000
X001
X007
* Input impedance
S/S
N
L
100 to 240V AC
Fuse
24V
0V
*