Replace Dc Input Modules With 6 Ma Rated Input Current (Qx41-S2, Qx81-S2) - Mitsubishi Electric Artisan MELSEC-Q Series Manual

5.2 Replace DC input modules with 6 mA rated input current (QX41-S2, QX81-S2)

5.2 Replace DC input modules with 6 mA rated input current (QX41-S2, QX81-S2)
Solution and Benefit
• 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.
(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.
Rated input current
AX41: 10 mA
AX42: 7 mA
Proximity sensors
Rated input current
QX41-S2: Approx. 6 mA
Proximity sensors
External resistor not required
外付け抵抗不要
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AX41·AX42
24 V DC
Replace with
QX41-S2
QX41-S2
24 V DC
Proximity sensors
Replace with
QX41
Measure to correct the rated
Rated input current
adjusted in accordance
with the connected device
Proximity sensors
External resistor required (for input current adjustment)
外付け抵抗 （入力電流調整用）
116
Rated input current
QX41: Approx. 4 mA
QX41
24 V DC
input current insufficiency
QX41
24 V DC