What does a CoDeSys specialist do?
A CoDeSys specialist builds industrial automation logic using the CODESYS development system and the IEC 61131-3 standard. This role focuses on writing, compiling, and transferring control applications to programmable logic controllers for manufacturing and process automation. The specialist manages the full lifecycle of controller code from initial design in structured text or function block diagrams to final deployment on hardware.
- Authors PLC control logic using IEC 61131-3 programming editors such as Structured Text, Function Block Diagram, Ladder Diagram, and Sequential Function Chart within the CODESYS environment. The specialist selects the appropriate language variant based on the complexity of the machine state and the readability requirements of the maintenance team.
- Compiles application code for specific target devices and transfers the generated binary to controllers through download operations or online changes. This process includes running syntax checks to validate logic integrity before pushing updates to live machinery to prevent operational faults.
- Manages project revisions by integrating version control systems like Git or SVN directly into the CODESYS development workflow. The specialist commits changes to repositories to track modifications across multiple engineering iterations and facilitates collaboration among distributed automation teams.
- Configures vendor-specific add-ons and agents within the CODESYS platform to support unique hardware features of the target controller. This work involves validating that third-party libraries and device descriptions function correctly with the core application logic before final commissioning.
How to hire a CoDeSys specialist on Upwork
Step 1: Post a job
Define your automation requirements and target controller hardware in the job description. The Job Post Generator powered by Uma™, Upwork's Mindful AI drafts a complete post from a few sentences about your needs. You can write a new post, update a saved draft, or reuse an existing post to start hiring.
- Specify which IEC 61131-3 programming languages the freelancer must use, such as Structured Text, Function Block Diagram, or Ladder Logic.
- List the specific controller brands and models that require CODESYS project development and code transfer.
- State whether the role requires version control integration using Git or SVN plugins within the CODESYS Development System.
Step 2: Evaluate candidates
Review portfolios for compiled application code and successful controller downloads. Uma runs instant video interviews and builds shortlists with side-by-side comparisons to help you assess technical fit quickly.
- Look for evidence of complex logic creation using multiple IEC 61131-3 editors in past CODESYS projects.
- Check for experience with online change operations that update running controllers without stopping production.
- Verify familiarity with vendor-specific add-ons, such as PLC agents, that support particular hardware platforms.
Step 3: Interview your top choices
Discuss how candidates structure CODESYS projects and manage revisions for industrial applications. Schedule and conduct interviews within Upwork Messages to receive an immediate transcript and summary after each session.
- Ask how they handle syntax checks and code generation errors during the compilation process.
- Request examples of how they configure integrations for specific target devices and controller applications.
- Discuss their approach to testing logic before transferring changes to live hardware via download.
Step 4: Agree on scope and begin work
Set clear milestones for project file delivery and controller updates. Use Upwork Messages and the contract workroom for communication and project management, plus identity verification, payment protection, hourly tracking, and project funds for security.
- Define deliverables as version-controlled project artifacts containing the final controller application logic.
- Require generated application code compiled specifically for your target hardware as a key milestone.
- Establish a protocol for safe online changes or full downloads to validate the new control logic.
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