LK3U-20-4AD-2DA PLC

LK3U Series

LK3U-20-4AD-2DA PLC

Model LK3U-20-4AD-2DA

LK3U-20 family selection reference with 12 digital inputs, 8 outputs and a 4 AD / 2 DA family column. High-speed output depends on the separately selected MR, MT or MRT suffix.

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Known model facts

LabelValue
Digital inputs / outputs12 / 8
Output choices8 relay (MR); 8 transistor (MT); 4 relay + 4 transistor (MRT)
Analog I/O family column4 AD / 2 DA
High-speed outputNone on MR; 4 channels on MT/MRT
Communication1 RS232 + 2 RS485

Product overview

This page uses LK3U-20-4AD-2DA as a selection label for the LK3U-20 size family with the manufacturer table’s 4 AD / 2 DA column. The manufacturer publishes the order rows as LK3U-20MR, LK3U-20MT and LK3U-20MRT; it does not publish this complete page label as one order code. The web table lists 12 digital inputs and 8 outputs. MR supplies eight relay outputs and no high-speed output; MT supplies eight transistor outputs with four high-speed channels; MRT combines four relay and four transistor outputs with four high-speed channels. The official sources disagree on enclosure dimensions: the web table states 117×125×56 mm, while the manual shell table states 117×108.6×65 mm. Confirm the physical revision and complete output suffix before ordering.

Key highlights

HighlightPublished value
Digital I/O12 / 8
Analog I/O family column4 AD / 2 DA
High-speed output4 channels on MT/MRT; none on MR
Communication1 RS232 + 2 RS485

Technical specifications

SpecificationPublished value
Published order rowsLK3U-20MR / LK3U-20MT / LK3U-20MRT
Digital inputs / outputs12 / 8
Relay outputs (MR)8
Transistor outputs (MT)8
Mixed outputs (MRT)4 relay + 4 transistor
Analog I/O family column4 AD / 2 DA
High-speed inputs2 by default; up to 6 configurable (series manual)
High-speed outputs4 on MT/MRT; none on MR
Maximum high-speed output frequencyY0–Y3 up to 200 kHz (series manual)
Communication ports1 RS232 + 2 RS485
Input powerDC 24V ±10%, 1A (series manual)
Program capacity32,000 steps (series manual)
Manufacturer web-table dimensions117×125×56 mm
Manual shell-table dimensions117×108.6×65 mm
Complete suffix requirementSelect MR, MT or MRT and any optional interface explicitly

LK3U-20-4AD-2DA product image

LK3U-20-4AD-2DA PLC gallery reference

LK3U-20-4AD-2DA PLC gallery reference

LK3U-20-4AD-2DA PLC gallery reference

LK3U-20-4AD-2DA PLC gallery reference

Technical drawings and reference images

LK3U-20-4AD-2DA dimension drawing

LK3U-20-4AD-2DA interface drawing

Features

  • Four high-speed transistor outputs on MT/MRT; MR has no high-speed output
  • 1 RS232 and 2 RS485 ports in the shared LK3U manual
  • 4 AD / 2 DA in the manufacturer LK3U-20 family table

Applications

  • Packaging equipment (sealing, cutting, labeling)
  • Multi-axis motion and servo/stepper positioning
  • Water and fluid treatment systems
  • Retrofit and replacement projects

Selection notes

Frequently asked questions

How many servo axes can the LK3U-20-4AD-2DA control via pulse output?

The published LK3U-20 MT and MRT rows provide four high-speed transistor outputs, while MR provides none. The shared manual rates Y0–Y3 up to 200 kHz; confirm the complete installed suffix before treating those channels as available.

What is the difference between the LK3U-20-4AD-2DA and adjacent models in the LK3U series?

Adjacent models in the LK3U series differ primarily in I/O point count and analog input channels. The suffix convention (e.g. 14-4AD-2DA) indicates total I/O points, analog input channels, and analog output channels. Choose the model with sufficient I/O and analog capacity for your application.

What programming software is used with the LK3U-20-4AD-2DA?

All LK PLC series use GX Developer or GX WORKS2 programming software. The connection is via RS232 serial port (or USB-to-RS232 adapter).