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To pose a hypothetical.
If I have a PLC tag let's say pressure. And I want to generate a high alarm, a low alarm, and an out of range alarm on said tag. I see multiple ways to do this and I am curious on Siemens stance.
Option 1 appears to be make multiple variables pointing to that same tag named pressure_high_limit etc.
Option 2 appears to be making one variable and setting multiple notifier rules.
Option 3 appears to be to use the alarms feature in WINCC UNIFIED ENGINEERING.
My question is this. What is Siemens stance as to what should be the source of truth for alarms on the system.
Siemens recommends utilizing the Alarms feature within WinCC Unified Engineering as the primary "source of truth" for alarm management in your system.
While options like creating multiple tag variables (Option 1) or using notifier rules (Option 2) are technically possible, they introduce complexity and potential for inconsistency. The dedicated alarm functionality offers benefits such as:
See these resources for more details:
While tags can *trigger* alarms, the alarm definitions, properties, and historical data should reside within the WinCC Unified alarm system.
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