Mitsubishi Electric MELSEC Q Series Handbook page 111

3
REPLACEMENT OF I/O MODULE
(43)Specifications comparison between A1SX81-S2 (negative common) and QX81
Specifications
Number of input points
Isolation method
Rated input voltage
Rated input 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
Current consumption
External dimensions
Weight
*1 Check the specifications of the sensor or switches to be connected to the QX81.
*2 The following shows the derating chart.
A1SX81-S2
32 points
Photocoupler
24VDC
Approx. 7mA
19.2 to 26.4VDC
(ripple ratio within 5%)
*2
Refer to the derating chart.
13VDC or more/3.5mA or more
6VDC or less/1.7mA or less
Approx. 3.3k
10ms or less (24VDC)
10ms or less (24VDC)
32 points/common
(common terminal: 17, 18, 36)
On indication (LED)
37-pin D-sub connector (accessory)
2
0.3mm
0.08A (typ. all points on)
130(H)34.5(W)93.6(D)mm
0.24kg
(A1SX81-S2)
: Compatible,
QX81
32 points
Photocoupler
24VDC
Approx. 4mA
20.4 to 28.8VDC
(ripple ratio within 5%)
*2
Refer to the derating chart.
19VDC or more/3mA or more
11VDC or less/1.7mA or less
Approx. 5.6k
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.
32 points/common
(common terminal: 17, 18, 36)
On indication (LED)
37-pin D-sub connector
(sold separately)
2
0.3mm (A6CON1E)
0.075A (typ. all points on)
98(H)27.4(W)90(D)mm
0.16kg
100
90
80
On
70
ratio
60
50
40
0 10 20
Ambient temperature
: Partially changed, : Incompatible
Compat-
Precautions for replacement
ibility



The rated input current is
*1
reduced.
The operating voltage range
differs.

The on voltage/on current differ.
*1
The off voltage differs.
The input resistance is
*1
increased.

Set the input response time of
parameter to the default value
(10ms).



Existing external wiring can be

used.
Note that the connecting
direction of the connector is

inverted.

(QX81)
28.8VDC
30 40 50 55
3
*1
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