LG LS Programmable Logic Controller K7M-DR30U K7MDR30U K7M-DR3OU

LS K7M-DR30U Programmable Logic Controller

Overview

The K7M-DR30U is a compact programmable logic controller in the MASTER-K / K120S family.

Publicly available LS series material and distributor references identify this model with 18 DC 24V input points and 12 relay output points, placing it in the compact controller class for machine-level control tasks rather than large modular rack systems.

LS also positions the broader MASTER-K series as a highly reliable PLC platform for industrial automation, which fits the practical role of this controller in installed equipment.

Technical Data

Application Value

The K7M-DR30U fits well in compact machine controls, utility skids, simple packaging equipment, conveyors, and OEM automation panels where a self-contained PLC with local DC inputs and relay outputs is more practical than a larger modular architecture.

Because the module uses relay outputs, it is especially suitable in cabinets where mixed field loads and conventional output-side switching are already part of the wiring design. 

This is an engineering inference based on the controller’s published input/output structure and the MASTER-K family’s industrial positioning.

Its value in maintenance work is also straightforward. In installed systems that already use K120S-class hardware, replacing the same controller model usually preserves the original terminal expectations, logic structure, and field-output behavior more cleanly than trying to adapt a different PLC family.

This is an engineering inference based on the model’s published fixed I/O format and the MASTER-K product-family role.

Replacement and Selection Perspective

For replacement work, the K7M-DR30U should be matched by input count, input voltage, relay-output structure, and controller family, not just by physical size.

In real cabinets, the difference between a relay-output PLC and another output type directly affects field wiring and load behavior. 

Matching the same 18-input / 12-relay-output structure is usually the safest way to keep the machine’s original control arrangement intact.

FAQ

Q1: What kind of controller is K7M-DR30U?
It is a compact LS programmable logic controller in the MASTER-K / K120S family, with 18 DC inputs and 12 relay outputs in one controller body.

Q2: What applications fit it best?
It fits small automation machines, conveyors, utility panels, and OEM control boxes where a compact PLC with local I/O is enough for the task.

This is an engineering inference based on the published fixed-I/O structure and the MASTER-K family’s industrial-control role.

Q3: Why do relay outputs matter on this model?
Relay outputs are flexible for field loads and are often preferred in legacy or mixed-load panels. In replacement work, keeping the same relay-output format usually reduces wiring changes and preserves the original output behavior.

This is an engineering inference based on the model’s published relay-output specification.

Q4: Why is exact model matching important here?
Because the controller’s input count, DC input range, and relay-output characteristics are part of the machine’s original design.

Even a similar-looking PLC may not preserve the same electrical behavior or commissioning path.

This is an engineering inference based on the published K7M-DR30U configuration.

Q5: What should be checked before ordering?
Check the installed part number, confirm the 18 DC input / 12 relay output requirement, verify the field supply range, and make sure the existing cabinet is built around the same MASTER-K control family.