Handling Of 24V Dc Input - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition

10.2.2 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.
Display module (option)
When the display module is mounted, the ON/OFF status can
be checked on the LCD display.
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. The FX
3U
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 X017 (up to the largest number in the main unit) have digital filters, and the filter time can be changed
in increments of 1ms in the range from 0 to 60ms through applied instructions. When 0 is specified for the
time, the input filter values are set as shown in the following table.
Input number
X000 to X005
X006, X007
X010 to X017
*1. When the circuit is used at an input filter value of 5µs, be careful when wiring.
(The details are stated later.)
*2. The FX
3U
The filter time for input numbers X010 to X017 is kept 10 ms because the input filters of the input/
output powered extension units/blocks are used for them.
168
-16M main unit input range is X000 to X007.
→ For the functions of the RUN terminals, refer to Subsection 14.2.1.
Input filter value when 0 is specified
*2
-16M main unit input range is X000 to X007.
10 Input Wiring Procedures (Input Interruption and Pulse Catch)
10.2 24V DC Input Type (Common to Sink/Source Input)
*1
5 µs
50 µs
200 µs
Fuse
L
N
100 to 240V AC
S/S
0V
24V
*
X000
X001
X007
* Input impedance
Fuse
L
N
100 to 240V AC
S/S
0V
24V
*
X000
X001
X007
* Input impedance
Remarks
−
−
Except FX -16M
3U