How to Use Discrete Alarms in Siemens HMI
🚨 How to Display Discrete Alarms in Siemens HMI (Comfort Panel)
In this video, you’ll learn how to configure and display discrete alarms in a structured and scalable way using a S7-1200 PLC and a Comfort HMI panel.
📌 What you’ll learn:
– Creating a Data Block (DB) containing a Word variable (e.g., "Motor")
– Using individual bits (X0 to X5) inside that Word as trigger flags for alarms
– Writing logic in a Function Block (FC) and calling it in the Main OB
– Configuring HMI alarm events linked to specific bits of the DB
– Designing a clean HMI screen for alarm visualization
– Live simulation in both PLC SIM and HMI Runtime
– How to trigger, acknowledge, and reset alarms
– Clear separation between incoming, acknowledged, and cleared states
This approach allows you to manage alarms cleanly, without using unnecessary M bits, and gives you a scalable structure for industrial-grade alarm handling.
💬 Do you usually use Data Blocks for alarms or prefer M tags?
Let us know your experience in the comments.
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