3o|||sheet Automation

3o|||sheet is a universal software environment for developing applications for Programmable Logic Controllers (PLCs).

• Hardware Independence
• Integrated Development Environment (IDE)

A lightweight, cross-platform IDE built on OpenJDK. Runs on single-board computers with minimal resources.

Supports LD, FBD, and ST languages plus a virtual machine instruction set for advanced logic design.

Offers extensive debugging capabilities: developers can modify code in real-time without physically restarting the PLC.

The development environment can create executable programs for the PLC in two modes:

• Classic PLC mode — cyclic model (OB, OB100). An optimized, economical mode that contains a minimum of additional programs.
• RTOS PLC mode — preemptive multitasking via a 1 ms timer interrupt. In this case, the IDE will additionally install a virtual real-time 3o|||sheet OS to execute tasks in parallel.

Is a standalone application that compiles text programs written in LD, FBD, ST and .3osheet into executable bytecode for a virtual machine.

The compiler can be integrated into third-party development tools (for example, Visual Studio, etc.).

It includes a complete set of tools for working with complex custom variables, virtual stack, and context management, enabling the development of sophisticated recursive algorithms and multithreaded tasks (coroutines).

Register-based Virtual Machine running safely in a sandbox. Works on devices with only 8 KB RAM and full peripheral access.

• Low-memory devices (~8 KB RAM)
• Safe sandboxed execution
• Controls GPIO, timers, UART, I²C, SPI, etc.
• Architecture-independent design

Stack and heap dynamically share a contiguous memory area, allowing flexible memory allocation with minimal overhead.

Execute multiple, hardware-isolated runtime environments on a single MCU. Ensures fault containment and enables functional safety.