Mitsubishi Electric MELSEC-Q Series - Page 72

3 REPLACEMENT OF I/O MODULE
3 - 19
(4) Specifications comparison between A1SX20EU and QX28
: Compatible, : Partially changed, : Incompatible
*1 Check the specifications of the sensor or switches to be connected to the QX28.
*2 The following shows the derating chart.
Specifications A1SX20EU QX28
Compat-
ibility
Precautions for replacement
Number of input points 16 points
8 points
(16 points occupied)
When 9 or more points are used,
use two QX28 modules.
Isolation method Photocoupler Photocoupler 
Rated input voltage 200-240VAC 50/60Hz 100-240VAC 50/60Hz 
Input voltage distortion Within 5% Within 5% 
Rated input current
Approx. 11mA
(240VAC 60Hz)
Approx. 17mA (200VAC, 60Hz),
Approx. 14mA (200VAC, 50Hz),
Approx. 8mA (100VAC, 60Hz),
Approx. 7mA (100VAC, 50Hz)

Inrush current
Maximum 500mA Within 1ms
(264VAC)
Maximum 500mA Within 1ms
(264VAC)

Operating voltage range 170 to 264VAC (50/60Hz±5%) 85 to 264VAC (50/60Hz±3Hz) 
Maximum number of
simultaneous input points
Refer to the derating chart.
*2
Refer to the derating chart.
*2

On voltage/on current 80VAC or more/4mA or more
80VAC or more/5mA or more
(50Hz, 60Hz)
The on current differs.
*1
Off voltage/off current 30VAC or less/1mA or less
30VAC or less/1.7mA or less
(50Hz, 60Hz)
The off current differs.
*1
Input resistance
Approx. 22k(60Hz),
Approx. 27k(50Hz)
Approx. 12k(60Hz),
Approx. 15k(50Hz)

The input resistance is
reduced.
*1
Response
time
Off  on 30ms or less (200VAC 60Hz) 10ms or less (100VAC 50Hz, 60Hz) 
On  off 55ms or less (200VAC 60Hz) 20ms or less (100VAC 50Hz, 60Hz) 
Common terminal
arrangement
16 points/common
(common terminal: TB9, TB18)
8 points/common
(common terminal: TB17)

Operation indication On indication (LED) On indication (LED) 
External connection
system
20-point terminal block connector
(M3.57 screws)
18-point terminal block
(M36 screws)

Wiring change is required.
Applicable wire size
0.75 to 1.25mm
2
(16 to 19 AWG)
Core: 0.3 to 0.75mm
2
(outside diameter: 2.8mm or less)

Applicable solderless
terminal
RAV1.25-3.5
R1.25-3 (Sleeved solderless
terminal cannot be used.)

Dielectric withstand
voltage
2830VAC rms/3 cycles
(altitude 2,000m)
2830VAC rms/3 cycles
(altitude 2,000m)

Insulation resistance
10M or more with an insulation
resistance tester
10M or more with an insulation
resistance tester

Current consumption 0.05A (typ. all points on) 0.05A (typ. all points on)
When two QX28 modules are
used, the current consumption is
increased. Review the current
capacity.
External dimensions 130(H)×34.5(W)×93.6(D)mm 98(H)×27.4(W)×90(D)mm Wiring space is narrower.
Weight 0.23kg 0.20kg
When two QX28 modules are
used, the weight is increased.
Calculate the weight carefully.
(A1SX20EU) (QX28)
200VAC
220VAC
240VAC
264VAC
On ratio (%)
100
90
80
70
60
50
40
0102030405055
On
ratio
Ambient temperature
100%
45
87.5%
55
100%
55
240
V
264
V