Mitsubishi Electric MELSEC-Q Series - Page 76

3 REPLACEMENT OF I/O MODULE
3 - 23
(8) Specifications comparison between A1SX40 (24VDC) and QX40
: Compatible, : Partially changed, : Incompatible
*1 Check the specifications of the sensor or switches to be connected to the QX40.
Specifications A1SX40 QX40
Compat-
ibility
Precautions for replacement
Number of input points 16 points 16 points 
Isolation method Photocoupler Photocoupler 
Rated input voltage 12/24VDC 24VDC 
Rated input current Approx. 3mA/Approx. 7mA Approx. 4mA
The rated input current is
reduced.
*1
Operating voltage range
10.2 to 26.4VDC
(ripple ratio within 5%)
20.4 to 28.8VDC
(ripple ratio within 5%)

Maximum number of
simultaneous input points
Simultaneously on (100%)
(26.4VDC)
Simultaneously on (100%) 
On voltage/on current 8VDC or more/2mA or more 19VDC or more/3mA or more
The on voltage/on current differ.
*1
Off voltage/off current 4VDC or less/1mA or less 11VDC or less/1.7mA or less
The off voltage/off current differ.
*1
Input resistance Approx. 3.3k Approx. 5.6k
The input resistance is
increased.
*1
Response
time
Off  on
10ms or less
(24VDC)
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.

Set the input response time of
parameter to the default value
(10ms).
On  off
10ms or less
(24VDC)
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.

Common terminal
arrangement
16 points/common
(common terminal: TB9, TB18)
16 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
Core: 0.3 to 0.75mm
2
(outside diameter: 2.8mm or less)

Applicable solderless
terminal
R1.25-3.5, R2-3.5,
RAV1.25-3.5, RAV2-3.5
R1.25-3
(Sleeved solderless terminal cannot
be used.)

Current consumption 0.05A (typ. all points on) 0.05A (typ. all points on) 
External dimensions 130(H)×34.5(W)×93.6(D)mm 98(H)×27.4(W)×90(D)mm Wiring space is narrower.
Weight 0.20kg 0.16kg