Beckhoff Sistema: Library

Filter the Beckhoff library for your specific sensor terminal (e.g., EL1904).

In the control room of the North Sea Wind Hub, lead automation engineer Mira stared at a single red tile on her HMI. For three days, the emergency stop circuit on Turbine 7 had been triggering at random—no pattern, no operator error, just chaos.

When designing a machine, you must prove it meets safety standards like DIN EN ISO 13849-1

She’d installed it months ago but never used it—a library of pre-certified safety function blocks, direct from the TwinCAT 3 Safety toolbox. “Sistema” wasn’t just a name; it was a reference to the EN ISO 13849-1 standard, the holy book of functional safety. beckhoff sistema library

Inside your library project, you can add function blocks (POUs), data structures (DUTs), and global variables just as you would in a standard project. The goal is to design components with clear, well-documented interfaces (their INPUT and OUTPUT variables) so they can be easily used without the end-user needing to understand the internal complexity.

Beckhoff's library is uniquely powerful for applications requiring runtime safety validation (e.g., collaborative robots, flexible manufacturing cells).

Beckhoff has done the heavy lifting of TCP/IP synchronization and election logic. Your job is simply to decide what data to synchronize and when to hand over the keys. Filter the Beckhoff library for your specific sensor

To generate the library, you simply build the library project. This creates the .library or .compiled-library file in your project's build output folder.

Unlike low-level libraries that handle bit manipulation or math functions, Sistema provides high-level software patterns. At its heart, the library is built around two primary paradigms:

Using the Beckhoff SISTEMA library transforms functional safety design from a tedious mathematical chore into a streamlined validation process. It ensures your TwinSAFE hardware is fully optimized, certified, and compliant with modern international standards. To help you finalize your safety documentation, When designing a machine, you must prove it

This is your status dashboard.

A library is a living entity. You will improve it, fix bugs, and add new features over time, creating different (e.g., v1.0.0, v1.0.1, v2.0.0).

For cutting-edge industrial applications, Beckhoff offers highly specialized libraries that turn a standard PLC into an intelligent edge device.

A packaging machine uses an emergency stop button (B&R or Allen-Bradley, but integrated with Beckhoff I/O) connected to a TwinSAFE EL1904 input terminal. The contactor is an EL2904 output terminal.

When working with modular Beckhoff hardware like the EtherCAT Terminals (EL series), the Tc3_Module library becomes essential. It provides the function blocks and data structures needed to dynamically discover, configure, and interact with these I/O modules from within your PLC logic, allowing for flexible and scalable machine designs.