WinCC Runtime Advanced Alarms & Event Messages: Complete TIA Portal Configuration Guide: Complete Contents
- 1. Start with an Alarm Philosophy
- 2. Build Deterministic Alarm Logic in the PLC
- 3. Configure Discrete Alarms
- 4. Configure Analog Alarms
- 5. Use Alarm Classes and Priorities
- 6. Acknowledgement and State Transitions
- 7. Configure the Runtime Alarm View
- 8. Alarm Logging and Runtime History
- 9. PLC-to-HMI Alarm Example
- 10. Alarm Commissioning Test
- 11. Common Alarm Problems
Practical WinCC Runtime Advanced Engineering Guide
1. Start with an Alarm Philosophy
Before creating messages, define what deserves an alarm, what is only a status message, which alarms require acknowledgement and how priorities are assigned. An alarm should require operator attention or action. Avoid generating hundreds of nuisance messages for every internal PLC condition; poor alarm quality reduces trust in the HMI.
2. Build Deterministic Alarm Logic in the PLC
Generate alarm conditions from real process logic: overload, high temperature, low pressure, drive fault, communication loss, safety trip and permissive failure. Where useful, apply filtering, delay or hysteresis in the PLC so the HMI receives stable states. Keep the raw process condition separate from latched trip logic when operators need to understand both.
3. Configure Discrete Alarms
Discrete alarms are ideal for Boolean conditions such as Motor_Fault, EStop_Active, VFD_Fault or Level_HighHigh. In the HMI alarm editor, map the trigger tag/bit, define message text, alarm class, priority and acknowledgement behavior. Message text should identify equipment, condition and expected operator action rather than displaying cryptic PLC tag names.
4. Configure Analog Alarms
Analog alarms monitor process limits such as temperature, pressure or flow. Define appropriate limit conditions and use engineering units in the operator message. If the PLC already calculates High/HighHigh/Low alarm bits with process hysteresis, using those discrete states can provide tighter control of alarm behavior. Choose one ownership model and apply it consistently.
5. Use Alarm Classes and Priorities
Create a manageable set of alarm classes such as Process, Equipment, Safety-related indication and System/Communication. Use priority to help operators focus on the most consequential condition first. Styling should reinforce meaning but not rely on color alone. Keep the class/priority matrix documented for future maintenance.
6. Acknowledgement and State Transitions
Test the full lifecycle: incoming active alarm, active acknowledged alarm, cleared-unacknowledged state if used, and cleared/acknowledged completion. The HMI should make the current state obvious. Acknowledgement must never be confused with removing the physical fault; the PLC process condition determines whether the alarm can clear.
7. Configure the Runtime Alarm View
Place an alarm control/view on the operator screen with useful columns such as time, state, priority, equipment and message. Provide filters for active alarms and history where appropriate. Avoid overloading the operator with engineering-only columns on production screens; create a deeper diagnostic view for maintenance personnel.
8. Alarm Logging and Runtime History
Enable alarm logging when historical troubleshooting, downtime review or compliance requires it. Decide retention and storage based on the machine purpose and Runtime resources. A useful alarm history allows maintenance teams to reconstruct the sequence of events around a stop instead of relying on memory.
9. PLC-to-HMI Alarm Example
// SCL-style PLC alarm preparation
Alarm_HighTemp := TempPV > TempHighLimit;
Alarm_MotorFault := MotorFaultInput OR DriveFault;
Alarm_CommLoss := NOT RemoteIO_Healthy;10. Alarm Commissioning Test
Prove every configured alarm deliberately. Trigger the source condition, confirm the correct text and timestamp, acknowledge it, clear the source and verify the final Runtime state. Test communication loss and restart behavior as well. An alarm configuration is not complete until the engineer has verified the complete state lifecycle.
11. Common Alarm Problems
| Problem | Typical cause | Action |
|---|---|---|
| Alarm never appears | Wrong trigger tag/bit | Watch PLC bit and HMI tag online |
| Alarm chatters | No hysteresis/filtering | Stabilize condition in PLC/process logic |
| Wrong text/equipment | Copy/paste configuration | Audit message-to-tag mapping |
| Acknowledgement unclear | Poor state/display setup | Test active/ack/cleared lifecycle |
WinCC Runtime Advanced Hands-On Lab
Use a non-production PLC/HMI project, document the test conditions, and verify every HMI behavior against the PLC watch table or diagnostics. The objective is not only to make the screen work, but to prove that the engineer can diagnose a deliberate fault and recover the system methodically.
Frequently Asked Questions
What alarms can WinCC Runtime Advanced display?
It can be engineered to display discrete/event alarms and process/limit-related messages, with alarm classes, acknowledgement behavior and Runtime alarm views.
Should alarm logic be in the PLC or HMI?
Critical process conditions are best owned by the PLC. The HMI should visualize, acknowledge and log the condition according to the alarm philosophy.
Why do alarms chatter in Runtime?
The source condition may be oscillating around a limit. Add suitable hysteresis, filtering or delay in the process/PLC logic instead of trying to hide the problem only in the HMI.
Does acknowledgement clear the fault?
No. Acknowledgement confirms the operator has seen the message; the process fault clears only when its actual source condition is removed.
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