Garage door control

This function block enables reliable door control – including opening, closing, stopping, and light barrier monitoring. Developed in Structured Control Language (SCL) and FBD , the code is available directly in the TIA Portal and can be easily integrated into PLC projects for door or hall vehicle control systems.

Note: All modules serve solely as a learning and optimization basis and are not approved for live operation. Plant modules, in particular, must be reviewed and approved by qualified personnel before productive use.

After power-up, all outputs are reset. The module then responds to the following inputs via edge detection:

• Open
• Close
• stop
• light barrier

The control is based on a finite state machine (FSM) with unique status values.

In idle mode, the stop LED is active. If an open signal is detected, the door moves upwards until:

• the upper limit switch is reached,
• a stop signal occurs or
• a change command (e.g. close) is detected.

In closing mode, the door moves downwards. As soon as the photocell is interrupted or a user command is given, the process stops immediately and switches to opening mode.

• State control: Finite state machine (FSM) with INT status
• Trigger: Edge detection via standard trigger function blocks
• Limit switch: Automatic return to rest state when end positions are reached
• Light barrier: Safety interruption when closing with automatic retraction
• Outputs: Clear setting of motor and LED signals to avoid conflicting states
• Code: Written entirely in SCL, modular and commented

• Simulation of garage, hall or access doors
• Integration into model systems, laboratories or training areas
• Practical example of FSM logic in automation
• Expandable for roller shutters, barriers or other drive types

Thanks to the clear separation of motor and sensor logic, the module can also be adapted for other mechanical applications.

• Siemens TIA Portal version V13 or higher (recommended: V16 or higher)
• Runs on S7-1200 and S7-1500 controllers
• Testable with PLCSIM
• Standardized input and output variables

• Complete SCL source code as .scl file
• Including all entry/exit declarations
• Trigger instances and state changes fully documented
• Brief description of the operation in the header area of ​​the file

The file can be imported and used directly in the TIA Portal.

Digital shipping will occur immediately after purchase.

Optionally, I offer support with:

• Integration into your existing project
• Extension of safety functions (e.g. soft stop, priority control)
• Adaptation to other PLC systems or installation scenarios

Feel free to contact us via email or shop message. Individual requests can be realized through customization.