Thread: Having just one alarm line with the last time stamp

1. Distributor
Join Date
25.04.2011
Posts
10

Having just one alarm line with the last time stamp

Hi

How is it possible to have just one alarm line in the alarm list with the last time stamp, when different alarms occur from an alarm limit continously?

Thanks

2. Re: Having just one alarm line with the last time stamp

do you mean that you have one variable, with several limits, which are all an alarm?

For one variable with multiple limits with an alarm, or a reaction matrix with multiple conditions as an alarm, the old alarm clears when another alarm for this variable becomes active.

3. Distributor
Join Date
25.04.2011
Posts
10

Re: Having just one alarm line with the last time stamp

For example, I have one variable with 0-10 measuring Range and with one limit.

the limit is value >5
The property "treat each change of value as new limit violation" is not activated.

1)the value changes from 4 to 6...the first alarm line can be seen in the alarm list with a time stamp.

2)it changes to 7 ... no new alarm line will be generated.

but I need the previous alarm line be replaced by the new one.

Thank You

4. Re: Having just one alarm line with the last time stamp

with one limit, "Maximum 5" as an alarm, you only have an alarm when the value is greater or equal than 5. It does not matter if the value is 5 first, then becomes 6 and then becomes 7, the alarm is still active!

The value became greater than 5, the limit is violated, and the alarm becomes active. When the value changes to 7, there is a change in value, but there is no difference for the alarm. Value 7 is still greater than 5 and no other limits are defined to clear the alarm and generate a new alarm.

You could setup:

limit "Maximum 5" - "Alarm - high"
limit "Maximum 7" - "Alarm - very high"
limit "Maximum 9" - "Alarm - critical"

this way you have an alarm "high" that comes when the value is 5 or 6. When the value becomes 7, this alarm clears, and a new alarm is generated "very high". This alarm stays active when the value is 7 or 8. When the value drops back again to 6, the "very high" alarm becomes inactive, and the "high" alarm becomes active again. When the variable value increases to "9", the "critical" alarm becomes active, the other alarms for this variable automatically inactive.

With only one limit, you have only one alarm that is generated when the limit is violoated and remains active as long as the limit is violated.

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