What programming languages or standards do smart relays use?

Hi everybody,

Smart relays generally use proprietary programming languages developed by the manufacturer, which are typically visual or graphical programming languages. However, most of these are based on industry standards, particularly IEC 61131-3.

IEC 61131-3 is a standard for programmable controllers and it defines five different programming languages:

    Ladder Diagram (LD): Graphically mimics electrical control schematics and is well-suited for programming processes that are sequential in nature. It's one of the most common programming languages for smart relays, especially for those used in building automation and industrial control systems.

    Structured Text (ST): A high-level text-based language that is similar to Pascal and is used for complex algorithms and mathematical functions.

    Function Block Diagram (FBD): A graphical language that allows for more complex control tasks and is typically used for process control systems.

    Instruction List (IL): Similar to assembly language, it's less commonly used in modern automation systems.

    Sequential Function Chart (SFC): Used for designing complex control systems and allows for easy visualization of system operation.

Different models and manufacturers may support different subsets of these languages. It's always a good idea to check the specific capabilities of a particular smart relay model before purchasing.

For smart relays, programming is usually done using a software provided by the manufacturer. The software will often provide a user-friendly interface to allow programming in one or more of these languages, and will include features to upload the program to the relay, debug the program, and monitor the operation of the relay.

Our visitors most frequently ask the following questions about smart relays:

- What is a smart relay and what is its function?

- What are the key differences between smart relays and PLCs?