Mitsubishi Electric MELSEC Q Series Handbook page 71

3
REPLACEMENT OF I/O MODULE
(3) Specifications comparison between A1SX20 and QX28
Specifications
Number of input points
Isolation method
Rated input voltage
Input voltage distortion
Rated input current
Inrush current
Operating voltage range
Maximum number of
simultaneous input points
On voltage/on current
Off voltage/off current
Input resistance
Off  on
Response
time On  off
Common terminal
arrangement
Operation indication
External connection
system
Applicable wire size
Applicable solderless
terminal
Current consumption
External dimensions
Weight
*1 Check the specifications of the sensor or switches to be connected to the QX28.
*2 The following shows the derating chart.
A1SX20
16 points
Photocoupler
200-240VAC 50/60Hz
Within 5%
Approx. 9mA (200VAC 60Hz)
Maximum 500mA Within 1ms
(264VAC)
170 to 264VAC (50/60Hz±5%)
*2
Refer to the derating chart.
80VAC or more/4mA or more
30VAC or less/1mA or less
Approx. 22k(60Hz),
Approx. 27k(50Hz)
30ms or less (200VAC, 60Hz)
55ms or less (200VAC, 60Hz)
16 points/common
(common terminal: TB9, TB18)
On indication (LED)
20-point terminal block connector
(M3.57 screws)
2
0.75 to 1.25mm
R1.25-3.5, R2-3.5,
RAV1.25-3.5, RAV2-3.5
0.05A (typ. all points on)
130(H)×34.5(W)×93.6(D)mm
0.23kg
(A1SX20)
200VAC
220VAC
240VAC
264VAC
: Compatible,
QX28
8 points
(16 points occupied)
Photocoupler
100-240VAC 50/60Hz
Within 5%
Approx. 17mA (200VAC, 60Hz),
Approx. 14mA (200VAC, 50Hz),
Approx. 8mA (100VAC, 60Hz),
Approx. 7mA (100VAC, 50Hz)
Maximum 500mA Within 1ms
(264VAC)
85 to 264VAC (50/60Hz±3Hz)
*2
Refer to the derating chart.
80VAC or more/5mA or more
(50Hz, 60Hz)
30VAC or less/1.7mA or less
(50Hz, 60Hz)
Approx. 12k(60Hz),
Approx. 15k(50Hz)
10ms or less (100VAC 50Hz, 60Hz)
20ms or less (100VAC 50Hz, 60Hz)
8 points/common
(common terminal: TB17)
On indication (LED)
18-point terminal block
(M36 screws)
2
Core: 0.3 to 0.75mm
(outside diameter: 2.8mm or less)
R1.25-3
(Sleeved solderless terminal cannot
be used.)
0.05A (typ. all points on)
98(H)×27.4(W)×90(D)mm
0.20kg
100
90
80
On
ratio 70
60
50
40
0 10 20
Ambient temperature
: Partially changed, : Incompatible
Compat-
Precautions for replacement
ibility
When 9 or more points are used,
use two QX28 modules.






Use it within the range shown in

the derating chart.
*1
The on current differs.
*1
The off current differs.
The input resistance is

*1
reduced.






Wiring change is required.

When two QX28 modules are
used, the current consumption is
increased. Review the current
capacity.
Wiring space is narrower.
When two QX28 modules are
used, the weight is increased.
Calculate the weight carefully.
(QX28)
100% 45
100% 55
240V
264V
87.5%55
30 40 50 55
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