Mitsubishi Electric QX81

Technical specifications

Manufacturer

Mitsubishi Electric

Manufacturer part no.

QX81

Type

Digital input module

Application

I/O module

Used with

MELSEC-Q base units

Input type

DC input (negative common type)

Number of input points

32 points

Rated input voltage

24 V DC (+20/-15 %, ripple ratio within 5 %)

Rated input current

Approx. 4 mA

ON voltage/ON current

19 V or more/3 mA or more

OFF voltage/OFF current

11 V or less/1.7 mA or less

Input resistance

Approx. 5.6 kΩ

Input response time, OFF to ON

1 ms, 5 ms, 10 ms, 20 ms, 70 ms or less

Input response time, ON to OFF

1 ms, 5 ms, 10 ms, 20 ms, 70 ms or less

Input common terminal arrangement

32 points/common

Isolation method

Photocoupler

Dielectric withstand voltage

560 V AC rms/3 cycles (altitude 2000 m)

Insulation resistance

10 MΩ or higher by insulation resistance tester

Protection degree

IP2X

Operation indication

ON indication (LED)

External interface,

37-pin D-sub connector

External interface, Applicable connector

A6CON1E, A6CON2E, A6CON3E (sold separately)

Number of occupied I/O points

32 points (I/O assignment: Input 32 points)

Internal current consumption (5 V DC)

75 mA (TYP. all points ON)

External dimensions, Height

98 mm

External dimensions, Width

27.4 mm

External dimensions, Depth

90 mm

Weight

0.16 kg

General specifications

Refer to the general specifications of the CPU module.

Technical documents (1)

• Mitsubishi Electric specification database, QX81

Key features

• Input type: DC input (negative common type)
• Number of input points: 32 points
• Rated input voltage: 24 V DC (+20/-15 %, ripple ratio within 5 %)
• Rated input current: Approx. 4 mA
• ON voltage/ON current: 19 V or more/3 mA or more

About the Mitsubishi Electric QX81

The Mitsubishi Electric QX81 is a MELSEC-Q input module. Mitsubishi Electric's overview: DC input, 32 points, 24 V DC 4 mA, response time: 1/5/10/20/70 ms, 32 points/common, negative common type, 37-pin D-sub connector. Mitsubishi Electric names the RX41C4 as its replacement model.

What is the QX81 used for?

The QX81 mounts on a MELSEC-Q base unit and connects field signals to the CPU, which reads or writes them each cycle.

Lifecycle and successor

Phased out.

OEM successor: RX41C4

Before you order

What to photograph or confirm so the right unit is quoted.

Check the model name QX81 on the rating plate, with the serial number and function version. Send us a photo of the rating plate and we will confirm the details before quoting.