Emergency stop system for machines

Description
You're looking for a lean SCL function block (FB_NotAusFreigabe) that evaluates your emergency stop circuit, enables manual acknowledgment, and controls a safe operating release. "Simulation"

Note: All modules are designed exclusively as a learning and optimization basis and are not approved for live operation. System modules, in particular, must be finally tested and commissioned by qualified personnel before productive use.

How it works

1. Emergency stop contact interrupted → set alarm, warning light on, block operation release
2. Contact re-established → Alarm remains reported, warning light remains on
3. Press the acknowledgement button → reset the internal emergency stop flag
4. No emergency stop + operating permit + start signal active → set release, status OK display on

Technical details
• Inputs: #EmergencyStopContact, #Acknowledgement, #OperatingPermission, #StartSignal
• Outputs: #Release, #Warning lamp, #Alarm, #Status_OK
• Internal variable: #NotAusGemeldet
• Two-stage logic: immediate alarm and blocking behavior, followed by acknowledgment and final release control

Possible applications
• Securing emergency stop functions in machine controls
• Retrofit in existing PLC projects
• Training and demo environments for safety concepts

compatibility
• Siemens S7-1200 & S7-1500
• TIA Portal V13 and higher; recommended V16+ for HMI integration and PLCSIM testing

Scope of delivery
• .scl file with declaration of all inputs/outputs, internal emergency stop flag and section comments
• Instant download link after purchase

Support
I can support you with HMI integration, adapting to other signal assignments, or adding logging and diagnostic functions. Feel free to contact me anytime via shop message or email.