LK3U Series

LK3U-20-4AD-2DA PLC

Model LK3U-20-4AD-2DA

The LK3U-20-4AD-2DA is a plc in the LK3U Series, featuring 12 DI / 8 DO (20 pt), 4 (Default 0-10V, configurable to 0-20mA or NTC10/50K temperature) analog inputs, and 4 channels 200K (MR type without high-speed output) pulse output.

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Known model facts

I/O Points: 12/8
Analog Input: 4
Pulse Output: 4 channels 200K
Communication: RS232 + RS485

Product overview

The LK3U-20-4AD-2DA is a plc model in the LK3U Series, offering 12 DI / 8 DO (20 pt) with 4 (Default 0-10V, configurable to 0-20mA or NTC10/50K temperature) analog inputs and 4 channels 200K (MR type without high-speed output) pulse output capability. LK3U is the flagship compact PLC series with 3 communication ports, 6+2 high-speed pulse outputs, and 4–10 analog inputs.

As part of the LK3U Series, this model shares the series' core platform — DC24V power, IP65 protection, and GX Developer / GX WORKS2 programming environment. Output types include MR (relay), MT (transistor), and MRT (mixed) where indicated.

Compared to other models in the LK3U Series, the LK3U-20-4AD-2DA sits between the LK3U-14-4AD-2DA (lower I/O count) and the LK3U-80-10AD-2DA (higher I/O count). For projects with fewer I/O points, a smaller model may reduce cost; for projects expected to scale, a larger model provides headroom without CPU replacement.

Source highlights

I/O Points: 12/8
Analog Input: 4
Pulse Output: 4 channels 200K
Communication: RS232 + RS485

Technical specifications

I/O: 12/8
Analog Inputs: 4 (Default 0-10V, configurable to 0-20mA or NTC10/50K temperature)
Analog Outputs: 2 (0-10V and 0-20mA compatible output)
Relay Output (MR): 8-channel Relay Output (Load AC250V/DC0V-DC30V<3A)
Transistor Output (MT): 8-channel Transistor Output (Load DC24V<0.5A)
Mixed Output (MRT): Y0-Y3 Transistor, Y4-Y7 Relay
HS Pulse Input: 2 (60K), expandable to 3-6 channels
HS Pulse Output: 4 channels 200K (MR type without high-speed output)
RS232 Port: 1 (Program download, HMI communication)
RS485 Port: MODBUS RUT/RS, Program download, HMI communication
NCAN: Optional 1-channel NCAN (Multi-PLC networking parallel connection, register sharing)
ECAN: Optional 1-channel ECAN (For expansion modules only, cannot be selected simultaneously with NCAN)
Weighing: Optional 1-2 channel weighing interface
Input Power: DC24±10%
Power: 24W
Power Loss Tolerance: <3ms
Mounting Hole: 107.5*116.4
Dimensions: 117*108.6*56
Operating Temp: -10°C~50°C
Storage Temp: -20°C~70°C
Humidity: 10-90%RH (non-condensing)
Vibration: 10-25HZ (X, Y, Z directions, 2g/30 minutes)
Cooling: Natural Cooling
Protection: IP65

Product gallery

Technical drawings and reference images

Features

4 channels 200K (MR type without high-speed output) high-speed pulse outputs for multi-axis motion
3 independent communication ports for HMI, VFD, and instrument networking
4 (Default 0-10V, configurable to 0-20mA or NTC10/50K temperature) analog input channels (0-10V / 0-20mA / NTC10/50K) for process sensing

Applications

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

Selection notes

Confirm total I/O points (DI + DO) and required output type (MR / MT / MRT).
MT or MRT output type required for pulse output — MR type has no high-speed output.
NCAN and ECAN are mutually exclusive — choose one per CPU.
Check cabinet depth: LK3U is 56 mm deep.

Frequently asked questions

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

The LK3U series provides 6×200KHz + 2×100KHz high-speed pulse output channels, supporting up to 8 independent motion axes. MT or MRT output type is required — MR type cannot generate high-speed pulses.

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).