7 alarm writing tips for dcs and scada
TRANSCRIPT
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WRITING ALARM MESSAGES7 TIPS LEADING TO BIG IMPROVEMENTS
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ALARM MESSAGES COME IN MANY FORMS
With ISA 18.2, alarm messages are split into multiple components, such as:
PURPOSE
GUIDANCE
TAG COMMENT
TIME-TO-RESPOND
CONSEQUENCE
AND MANY MORE…
WHAT FOLLOWS ARE SIMPLE TIPS TO MAKE MEANINGFUL IMPROVEMENTS IN WRITING
ALARM INFORMATION, INCLUDING TAG COMMENT (24 CHARACTERS)
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Think from the operators perspective:
WHAT DO THEY NEED TO KNOW?
WHAT INFORMATION OR KNOWLEDGE DO THEY HAVE AVAILABLE?
TIP 1 – BE RELEVANT TO THE OPERATOR
The contentMUST BE RELEVANT
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OPERATORS ARE ACTUALLY BUSY
ACHIEVING THE GOALIS WHAT MATTERS
Strip trivial information to keep focus on what
matters
Nothing more, nothing less
In other wordsKEEP IT SIMPLE & TO THE POINT
TIP 2 – BE CONCISE
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EVERYTHING SHOULD BE MADEAS SIMPLE AS POSSIBLE
BUT NOTSIMPLER
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TIP 3 – BE CONSISTENT
There are several ways to say the same thing:
TANK 1 IS APPROACHING HH LIMIT
TANK 1 IS REACHING HH LIMIT
T1 APPROACHING HH
MESSAGES SHOULD BE CONSISTENT AND BE BASED ON STANDARD, AGREED UPON
TERMINOLOGY, THAT IS KNOWN AND USED BY ALL OPERATORS
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TIP 4 – BE OUTCOME FOCUSED
Alarm messages should be focused on telling the operator what the problem is, and then guide the
operator towards the appropriate action
EVERY ALARM SHOULD BE THE RESULT OF AN OPERATOR ACTION;EACH OPERATOR ACTION SHOULD BE A RESULT OF:
AN ALARM,MANAGEMENT REQUEST,
ORIMPROVEMENT OPPORTUNITY
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TIP 5 – EASILY READABLE
This is self-explanatory
Alarm messages should be presented in a manner that is clear, well structured, quick and simple to read.
WE DO NOT WANT THE OPERATOR TO LOOSE VALUABLE SECONDS DUE TO POOR
LANGUAGE IN THE MESSAGE
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Alarms usually display the following information:
DATE/TIME STAMP
Example:On some HMI systems, the operator will always be shown the tag-name, so in that case we should be sure not to include the tag-name in the message to ensure that we’re not duplicating the same information
SEVERITY
TAG NAME
ALARM MESSAGE (TOPIC)
TIP 6 – DUPLICATION OF CONTENT
We should ensure to not duplicate information already provided to the
operator
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Operators know their facility in extreme detail, from an operations perspective...
TIP 7 – OPERATOR LANGUAGE/TERMINOLOGY
KNOW THE LANGUAGE OF THE OPERATORS AND WRITE ALARMS
INTHE SAME LANGUAGE
THE CORE GOAL OF ALARM SYSTEMS IS TO SUPPORT THE
OPERATOR:It is critical that alarms are written in a manner that
matches the operator’s language, training and mental model
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CONCLUSION
DON’T BE TOO SET ON ONLY ACHIEVING THE ISA18.2 NUMERICAL TARGETS WHEN MANAGING AN ALARM SYSTEM
SMALL IMPROVEMENTS AND SIMPLICITY IN ALARM MESSAGES TRANSLATE TO SIGNIFICANT IMPROVEMENTS IN AN OPERATORS DAILY WORK
IMPROVED ALARMS WILL ALWAYS BE APPRECIATED BY YOUR OPERATORS
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THANK YOU!
ALARM METRICS
HAZOP STYLE ALARM WORKSHOPS
IMPLEMENTING ALARM MANAGEMENT
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