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MELSEC-Q
2 INPUT MODULE SPECIFICATIONS
2.22 QX81-S2 DC Input Module (Negative Common Type)
Type
Specifications
DC input module (Negative common type)
QX81-S2 Appearance
Number of input points 32 points
Isolation method Photocoupler
Rated input voltage 24VDC (+20/-15%, ripple ratio within 5%)
Rated input current Approx. 6mA
Input derating Refer to the derating chart.
ON voltage/ON current 15V or higher/3mA or higher
OFF voltage/OFF current 5V or lower/1.7mA or lower
Input impedance Approx. 3.6kΩ
Response
time
OFF to ON
1ms/5ms/10ms/20ms/70ms or less (configured in PLC parameter) 1
(Default: 10ms)
ON to OFF
1ms/5ms/10ms/20ms/70ms or less (configured in PLC parameter) 1
(Default: 10ms)
Dielectric withstand voltage 560VAC rms/3 cycles (altitude 2000m)
Insulation resistance 10MΩ or more by insulation resistance tester
Noise immunity
By noise simulator of 500Vp-p noise voltage, 1 s noise width
and 25 to 60Hz noise frequency
First transient noise IEC61000-4-4: 1kV
Protection degree IP2X
Common terminal arrangement 32 points/common (common terminal: 17, 18, 36)
Number of occupied I/O points 32 points (I/O assignment is set as a 32-point input module.)
Operation indicator ON indication (LED)
External connections 37-pin D-sub connector
Applicable wire size
0.088 to 0.3mm
2
(For A6CON1E) 2
Applicable connector A6CON1E, A6CON2E, A6CON3E (optional)
Applicable connector/terminal block
converter module
A6TBX36-E, A6TBX54-E, A6TBX70-E
Internal current consumption
(5VDC)
75mA (TYP. all points ON)
(0.08A is shown on the rating plate of the module.)
Weight 0.16kg
Derating chart Pin-Outs
Pin
No.
Signal
No.
Pin
No.
Signal
No.
Module front view
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
External connection
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
1: For the setting method, refer to Section 1.3.1.
2: When using A6CON2E or A6CON3E, refer to Chapter 7.
100
90
80
70
60
50
40
0102030405055
30
20
10
ON
ratio
mbient temperature
( )
(%)
(31.25%) 24VDC
(18.75%) 28.8VDC
37
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