外付け抵抗不要
外付け抵抗(入力電流調整用)
Rated input current
AX41: 10 mA
AX42: 7 mA
Rated input current
QX41-S2: Approx. 6 mA
Rated input current
QX41: Approx. 4 mA
Rated input current
adjusted in accordance
with the connected device
Proximity sensors
AX41·AX42
Proximity sensors
QX41
Proximity sensors
QX41-S2
Proximity sensors
QX41
24 V DC
External resistor not required
External resistor required (for input current adjustment)
24 V DC
24 V DC
24 V DC
Main circuit
Main circuit
Main circuit
Main circuit
Measure to correct the rated
input current insufficiency
Replace with
QX41
Replace with
QX41-S2
Q Series
A (Large Type) Series
32 points / common 32 points / common
32 points / common
Number of input points
64
32
Rated input voltage
Common terminal
arrangement
Approx. 3.4 kΩ
Approx. 3.3 kΩ
External connection
method
40 pin connector
(With solder)
40 pin connector
(With solder) × 2
40 pin connector
(With solder)
32
20.4 to 28.8 V DC
8 points / common
Approx. 7 mA
Approx. 7 mA
Approx. 4 mA
Rated input
current
Approx. 6 mA
Approx. 10 mA
Approx. 5.6 kΩ
Input resistance
Approx. 3.6 kΩ
Approx. 2.4 kΩ
Approx. 3 mA
Approx. 3 mA
(N/A)
(N/A)
24 V DC
12 V DC
Approx. 4 mA
32
AX42
QX41
QX41-S2
AX41
10.2 to 26.4 V DC
10.2 to 26.4 V DC
38-point
terminal block connector
(M3 × 6 screws)
Q Series
A (Large Type) Series
32 points / common
32 points / common
Number of input points
64
32
Rated input voltage
Common terminal
arrangement
Approx. 3.4 kΩ
External connection
method
37 pin
D-sub connector
37 pin
D-sub connector × 2
37 pin
D-sub connector
32
20.4 to 28.8 V DC
8 points / common
Approx. 7 mA
Approx. 4 mA
Rated input
current
Approx. 6 mA
Approx. 10 mA
Approx. 5.6 kΩ
Input resistance
Approx. 3.6 kΩ
Approx. 2.4 kΩ
Approx. 3 mA
(N/A)
(N/A)
24 V DC
12 V DC
Approx. 4 mA
32
AX82
QX81
QX81-S2
Item
Item
AX81
10.2 to 26.4 V DC
38-point
terminal block connector
(M3 × 6 screws)
(1) Image of internal circuit when replacing existing A Series DC input module
The following figures use AX41 and AX42 as an example of how to replace the existing A Series DC input
modules (AX41, AX42, AX81, AX82, A1SX41 and A1SX81). The internal circuits show the rated input currents
and provide countermeasures for current insufficiency.
* AX41 and AX42 have different common wiring, but the rated input current specifications and the
countermeasure of installing an external resistor are the same.
(1) Specification comparison of QX41-S2 input module (positive common (sink) type)
(2) Specification comparison of QX81-S2 input module (negative common (source) type)
(2) Specification comparison
• When replacing with the existing A Series module, the rated input current of the DC input module
becomes smaller.
In some cases, the previous Q Series DC input modules were not able to detect input signals from
the external devices due to current insufficiency.
Such issue can be solved by using DC input modules with 6 mA rated input current (QX41-S2 and
QX81-S2).
• The pin arrangement is identical to the existing Q Series DC input module (connector type). The
existing external wiring can be utilized to reduce replacement time.
Solution and Benefit
• The pin arrangement of the A Series connector type DC input module is the same as the Q Series. Since the
current module connector’s wiring can be used, the replacement can be completed just by switching the
modules.
Note that when using negative common (source) type modules, the A Series DC input module and the
connector are reversed. However, connectors of the existing module can be utilized.
• QX41-S2 and QX81-S2 can also be used when Q large type base unit is used in combination with the
upgrade tool manufactured by Mitsubishi Electric Engineering Co., Ltd. to connect the existing input module
AX41/AX81's terminal block with the external wiring.
Tip
A (Small Type) Series
32
A1SX41
32 points / common
Approx. 3.3 kΩ
Approx. 7 mA
Approx. 3 mA
10.2 to 26.4 V DC
A (Small Type) Series
32
A1SX81
5.2 Replace DC input modules with 6 mA rated input current (QX41-S2, QX81-S2)
116
5.2 Replace DC input modules with 6 mA rated input current (QX41-S2, QX81-S2)
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