Comprehensive Guide to Resetting Your Siemens Fire Alarm Panel

Key Takeaways Table

IntroductionImportance and purpose of resetting Siemens fire alarm panels.
Understanding ComponentsOverview of HMI, PLC, and WinCC.
Resetting ProceduresStep-by-step guide for using HMI screen and external buttons, including WinCC functions.
Troubleshooting IssuesCommon problems and solutions, including programming errors and tag usage.
Expert TipsBest practices for programming and maintenance.
Visual AidsDiagrams, screenshots, and flowcharts to assist with the reset process.
FAQsAnswers to frequently asked questions and real-world examples.
ConclusionSummary of key points and additional resources for further assistance.


Resetting your Siemens fire alarm panel is essential for maintaining safety and ensuring the system functions correctly. Whether you’re dealing with a minor issue or a significant fault, knowing how to reset your panel can save time and prevent potential hazards. This guide aims to provide clear, step-by-step instructions on resetting Siemens fire alarm panels, troubleshooting tips, and expert advice to help you handle common issues effectively.

Understanding Your Siemens Fire Alarm Panel


  • HMI (Human-Machine Interface): The user interface that allows you to interact with the alarm panel, providing real-time data and control options.
  • PLC (Programmable Logic Controller): The brain of the system, controlling the operations and logic of the fire alarm.
  • WinCC (Windows Control Center): Software used for monitoring and controlling the fire alarm system, offering advanced features and customization.


  • Acknowledgment: Confirming the receipt of an alarm.
  • Reset: Clearing the alarm and returning the system to normal operation.

Step-by-Step Guide to Resetting the Alarm

Initial Steps

  1. Check Error Codes: Examine the alarm panel to identify specific alarms or faults displayed.
  2. Record Details: Note down any error codes or messages for reference.

Resetting Procedures

Using the HMI Screen

  1. Navigate to Alarm Screen: Access the alarm reset options through the HMI.
  2. Select Reset Option: Follow the on-screen prompts to reset the alarm.

External Buttons

  1. Identify Buttons: Locate the designated reset button on the panel.
  2. Press the Button: Hold the reset button for a few seconds to initiate the reset process.
  3. Confirm Reset: Ensure the alarm indicators return to normal.

WinCC Functions

  1. AXC_OnBtSignlAckn and AXC_OnBtnVisibleAckn:
    • Access Functions: Use WinCC to execute specific reset actions.
    • Detailed Instructions: Follow the steps to implement these functions within the software.
  2. AlarmViewAcknowledgeAlarm and AcknowledgeAlarm:
    • Select Alarms: Acknowledge and reset alarms through WinCC Flexible.
    • Implementation: Detailed guidance on utilizing these functions.

Troubleshooting Common Issues

Unsuccessful Reset Attempts

  • Check Connections: Ensure all cables and connections are secure and functioning.
  • Verify Programming: Confirm the PLC and HMI are correctly programmed to handle resets.

Programming Errors

  • Common Mistakes: Identify and correct typical programming errors that may prevent a successful reset.
  • Reset Procedures: Implement the correct reset functions within the program.

HMI Ack Tag and PLC Ack Tag

  • Functionality: Understand the roles these tags play in the reset process.
  • Common Problems: Solutions for typical issues encountered with these tags.

Expert Tips and Best Practices

Programming Tips

  • Setup: Properly configure alarms and acknowledgments within your system.
  • Efficiency: Optimize the reset process to ensure quick and reliable responses.

Maintenance Tips

  • Regular Checks: Perform routine maintenance to prevent false alarms and ensure system reliability.
  • System Updates: Keep your software and firmware up to date to benefit from the latest features and improvements.


How to Reset After a Power Failure?

When your Siemens fire alarm panel experiences a power failure, resetting the system is crucial to ensure proper functionality. Here’s what you need to do:

  1. Power On the System: Ensure the system is back online.
  2. Check for Errors: Look for any error codes or messages on the HMI screen.
  3. Perform a Reset: Follow the standard resetting procedures using either the HMI screen or external buttons.

What to Do If the Alarm Doesn’t Reset?

If your Siemens fire alarm panel does not reset after following the standard procedures, consider these steps:

  1. Verify Connections: Check all physical connections for any loose or damaged wires.
  2. Review Programming: Ensure the PLC and HMI programming is correctly configured.
  3. Consult the Manual: Refer to the Siemens user manual for specific troubleshooting steps.
  4. Contact Support: If issues persist, reach out to Siemens support for further assistance.

Real-World Examples

Case Study 1: Factory Reset Issue A factory experienced frequent fire alarm resets that were unsuccessful. The solution involved updating the WinCC software and reprogramming the PLC to correct a misconfigured acknowledgment tag.

Case Study 2: Office Building Alarm An office building had a persistent alarm that wouldn’t reset. Technicians discovered a faulty connection in the HMI panel, which was resolved by replacing the connector and ensuring all components were properly secured.

Visual Aids and Diagrams

To help you better understand the reset process, we provide visual aids that illustrate each step clearly.


  • HMI Screen Navigation: Step-by-step images showing how to access and navigate the alarm reset options.
  • External Button Reset: Photos of the specific buttons used for resetting the alarm panel.


  • Reset Procedure Flowchart: A visual representation of the entire reset process, from identifying the alarm to confirming the reset.

Programming Snippets

  • Code Examples: Practical code snippets for implementing reset functions in both PLC and HMI, enhancing your understanding of the technical details.


Resetting your Siemens fire alarm panel is a vital skill that ensures the safety and reliability of your system. By following the detailed steps outlined in this guide, you can efficiently handle resets and troubleshoot common issues. Remember to perform regular maintenance and keep your system updated to prevent problems. For more detailed guidance and resources, visit ControlNexus.


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