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The MELSEC-L Series will innovate and evolve your production site by providing flexibility and excellent ease-of-use.

The MELSEC-L Series has been designed based on a passion for monozukuri (creation), trustworthy technology and reliability. This concept also applies to system installation and operation.

Rack-free modular controller

The L series is a powerful but compact modular controller with many features built-in to the CPU itself. With its excellent cost performance and usability it is ideal for use in mid-size control applications.

High system flexibility

The rack-free design promotes high system flexibility with minimum form factor. The single-CPU architecture includes built-in Ethernet and Mini-USB interfaces, a SD/SDHC memory card slot for program storage and data logging, and 24 digital I/O for simple high-speed counting and positioning functions. The high-performance CPU also includes a CC-Link V2 Master/Local station for connection to the powerful open field network CC-Link.

Besides the functions already built-in, the CPU can be supplemented with up to 10 extension and special function modules for additional digital and analog I/Os, highspeed counters, communications interfaces, Simple Motion, positioning etc.

The compact size, easy expandability, networking capabilities, and multitude of built-in high-powered functions makes the L series ideal for both stand-alone machines as well as networked stations in larger applications.

Data logging

The built-in data logging function provides an easy way to collect information for troubleshooting, performance evaluation, and other uses. The included configuration tool makes setting up the data logging function a breeze with a step-by-step wizard like interface. Using GX LogViewer, the captured data is easy to interpret and understand.

USB and Ethernet as standard

The built-in USB 2.0 port or Ethernet interface can be used to connect directly at the installation site. The Ethernet interface supports direct connection and does not require any configuration of the PLC or PC to operate.

Advanced programming software

GX Works2 represents the next generation in PLC maintenance and programming software and is perfectly suitable for the L series.

Product range – L series

Control method Stored program repeat operation
I/O control mode Refresh mode (Direct mode is available by specifying the direct access input/output (DX, DY).)
Programming language (sequence control language) Function block, relay symbol language, MELSAP3 (SFC), MELSAP-L, structured text (ST), logic symbolic language
Processing speed 40 ns 9.5 ns
Program size 20k steps (80k bytes) 260k steps (1040k bytes)
Memory capacity Program memory 80 k bytes 1040 k bytes
Standard RAM 128 k bytes 768 k bytes
Standard ROM 512 k bytes 2048 k bytes
Expandability with additional modules Up to 10 extension and special function modules (for additional digital/analog I/Os, high-speed counters, interfaces, network, Simple Motion, positioning etc.)*
Built-in I/O function Positioning, high-speed counter, pulse catch, interrupt input, general input/output
Data Logging function High-speed data sampling, auto logging function, easy-to-see graphical analysis, trigger logging function
Built-in Ethernet function 100 or 10 Mbps. Direct connection with either a cross or straight LAN cable. No configuration necessary
Built-in CC-Link function Operates as Master or Local CC-Link station
Clock function Year, month, date, hour, minute, second, and day of the week (automatic leap year detection)
5 V DC internal current consumption 0.94 A 1.37 A
Number of I/O device points 8192 points (X/Y0 to X/Y1FFF)
Number of I/O points 1024 points (X/Y0 to X/Y3FF) 4096 points (X/Y0 to X/YFFF)
Operating ambient temperature 0–55 °C


The L Series CPUs feature a variety of control functions and built in I/O included as standard. By adding additional modules it can be customized to suit each individual application.

Branch/extension module

This module allows the system to be extended to match the size of your production facility.

Power supply

These modules supply electrical power for use by the CPU, input/output modules etc.

I/O module

These modules are for connecting input and output devices. Assorted I/O modules are available to suit your system needs.