User`s manual

Input/output module specifications Specifications
MELSEC System Q, Hardware 12 – 27
12.3.16 Digital input module QX81

The response times OFF –> ON and ON –> OFF can’t be set to different values.
Item QX81
Number of input points 32
Isolation method Photocoupler
Rated input voltage 24 V DC (+20/–15 %, ripple ratio within 5 %)
Rated input current approx. 4 mA
Max. simultaneously ON refer to the derating chart
Inrush current —
ON voltage/ON current
≥ 19 V DC / ≥ 3 mA
OFF voltage/OFF current
≤ 11 V DC / ≤ 1.7 mA
Input impedance approx. 5.6 K
Ω
Response time
OFF
→ ON 1, 5, 10, 20, 70 ms
(Response time setting by parameters, initial setting: 10 ms)

ON → OFF 1, 5, 10, 20, 70 ms
(Response time setting by parameters, initial setting: 10 ms)

Groups of input 1; 32 points/common
(common terminal: 17, 18, 36)
Input status display One LED per input
Dielectric withstand voltage 560 V AC rms/3 cycles (altitude 2000 m)
External connections 37-pin D-sub connector
Applicable wire size
0.3 mm
2
Accessories External wiring connector
Internal current consumption (5 V
DC)
75 mA (all input points ON)
Weight 0.16 kg
External connections Pin Signal Pin Signal
1 X00 9 X10
20 X01 28 X11
2 X02 10 X12
21 X03 29 X13
3 X04 11 X14
22 X05 30 X15
4 X06 12 X16
23 X07 31 X17
5 X08 13 X18
24 X09 32 X19
6 X0A 14 X1A
25 X0B 33 X1B
7 X0C 15 X1C
26 X0D 34 X1D
8 X0E 16 X1E
27 X0F 35 X1F
17 COM 37 Vacant
36 COM 19 Vacant
18 COM
Tab. 12-26: Input module QX81
QH00033C_UK
Fig.12-8:
QX81 Derating chart
LED
18
36
17
35
1
24 V DC
Internal
circuit
Input module
28.8 V DC
100
90
80
70
60
50
40
0 102030
40 5055
%
[C]
°
Ambient temperature
ON ratio