Dc Input (Sink And Source Input Type); Handling Of 24 V Dc Input - Mitsubishi Electric MELSEQ FX3S Series User Manual

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition
9.2 24 V DC input (Sink and source input type)
This section explains handling of 24 V DC inputs in the main unit, precautions on input device connection, and
external wiring examples.
→ For specifications and wiring examples of the built-in analog inputs, refer to Chapter 11.
9.2.1

Handling of 24 V 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
terminals by setting parameters.
*1. X000 to X005 in the FX
X013 in the FX
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. 10 ms in response to input-switching from ON to OFF and from OFF to ON.
Change of filter time
X000 to X017 have digital filters, and the filter time can be changed in increments of 1 ms in the range from 0
to 15 ms 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
X000, X001
X002 to X007
X010 to X017
-10M main unit, X000 to X007 in the FX
3S
-20M main unit
3S
→ For the functions of the RUN terminals, refer to Subsection 14.2.1.
Input filter value when 0 is specified
10 μs
50 μs
200 μs
9.2 24 V DC input (Sink and source input type)
→ For the input specifications, refer to Section 4.3.
*
*
*1
) of the main unit can be used as RUN input
-14M main unit and X000 to
3S
9 Input Wiring Procedures
Fuse
L
N
100 to 240 V AC
S/S
0V
24V
X000
X001
X007
*Input impedance
Fuse
L
N
100 to 240 V AC
S/S
0V
24V
X000
X001
X007
*Input impedance
77
1
2
3
4
5
6
7
8
9
10