Mitsubishi Electric Q20UDHCPU

Technical specifications

Manufacturer

Mitsubishi Electric

Manufacturer part no.

Q20UDHCPU

Type

MELSEC-Q CPU module

Application

PLC controller

Used with

MELSEC-Q base units

Control method

Stored program cyclic operation

I/O control mode

Refresh mode; (The direct access input/output is available by specifying the direct access input/output (DX, DY).)

Programming language, Sequence control language

Relay symbol language, logic symbolic language, MELSAP3 (SFC), MELSAP-L, function block and structured text (ST)

Processing speed, Sequence instruction, LD X0

9.5 ns

Processing speed, Sequence instruction, MOV D0 D1

19 ns

Constant scan

0.5...2000 ms (setting is available in increments of 0.5 ms by parameter)

Program capacity

200K steps (800K bytes)

Memory capacity, Program memory (drive 0)

800K bytes

Memory capacity, Memory card (RAM) (drive 1)

Size of the installed memory card (8M bytes max.)

Memory capacity, Memory card (ROM) (drive 2)

Size of the installed memory card (Flash card: 4M bytes max., ATA card: 32M bytes max.)

Memory capacity, Standard RAM (drive 3)

1280K bytes

Memory capacity, Standard ROM (drive 4)

4096K bytes

Memory capacity, CPU shared memory, QCPU standard memory

8K bytes

Memory capacity, CPU shared memory, Multiple CPU high speed transmission area

32K bytes

Number of I/O device points

8192 points (X/Y0...1FFF)

Number of I/O points

4096 points (X/Y0...FFF)

RUN/PAUSE contact

One contact can be set up in X0 to X1FFF for each of RUN and PAUSE.

Clock function

Year, month, date, hour, minute, second, and day of week (automatic leap year detection); Accuracy: -2.96...+3.74 s (TYP. +1.42 s)/d at 0 ˚C; Accuracy: -3.18...+3.74 s (TYP. +1.50 s)/d at 25 ˚C; Accuracy: -13.20...+2.12 s (TYP. -3.54 s)/d at 55 ˚C

Allowable momentary power failure time

The time differs depending on the power supply module used.

Internal current consumption (5 V DC)

0.39 A

External dimensions, Height

98 mm

External dimensions, Width

27.4 mm

External dimensions, Depth

89.3 mm

Weight

0.20 kg

Operating ambient temperature

0...55 ˚C

Technical documents (1)

• Mitsubishi Electric specification database, Q20UDHCPU

Key features

• Program memory: 800K bytes
• Current consumption (5 V DC): 0.39 A
• Weight: 0.20 kg

About the Mitsubishi Electric Q20UDHCPU

The Mitsubishi Electric Q20UDHCPU is a MELSEC-Q CPU module. Mitsubishi Electric's overview: Number of I/O points: 4096, number of I/O device points: 8192, program capacity: 200K steps, basic operation processing speed (LD X0): 9.5 ns, program memory capacity: 800K bytes, multi-CPU high-speed communication, external interface: USB/RS-232, with memory card interface. Mitsubishi Electric lists it as discontinued since 2026/10, with repair support until 2033/10. Mitsubishi Electric names the R32CPU as its replacement model.

What is the Q20UDHCPU used for?

The Q20UDHCPU runs the control program on a MELSEC-Q base unit, working with the I/O, intelligent function and network modules on the base.

Lifecycle and successor

Discontinued.

OEM successor: R32CPU

Before you order

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

Check the model name Q20UDHCPU 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.