By alarm
This criterion defines an operational band through a maximum and minimum. When the analog input
exceeds the maximum value a Historical is generated by maximum, when the analog input is lower than
the minimum a Historical by minimum is generated and when the analog input passes from a maximum
value or from a minimum value to a normal value between both a Historical by normal value is generated.
In this manner we can follow the evolution of the input when it fluctuates between the specified limits. In
addition to the maximums and minimums a value of hysteresis must be defined to avoid continuous
generation of Historicals when the analog signal oscillates above a threshold value. In the following figure
we can see how the hysteresis mechanism works for the maximum.
The same happens for minimum values but in an exactly opposite manner.
cLAN-MQ User Manual
Reports and Historical records
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