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Device handbook SINEAX DM5000
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7.6 Alarming
The alarming concept is very flexible. Depending on the user requirements simple or more advanced
monitoring tasks may be realized. The most important objects are limit values on base quantities, the
monitoring of fault-current, monitoring functions and the summary alarm.
7.6.1 Limit values on base quantities
Using limit values either the exceeding of a given value
(upper limit) or the fall below a given value (lower limit)
is monitored.
Limits values are defined by means of two parameters:
Limit for ON / OFF. The hysteresis corresponds to the
difference between these two values.
If a data logger is implemented both state transitions
OFF
→ON and ON→OFF can be recorded as event or
alarm in the appropriate lists.
Upper limit: Limit for ON
≥ Limit for OFF
►
The limit value becomes active (1) as soon as
the limit for ON state is exceeded. It remains
active until the associated measured quantity
falls below the limit for OFF state again.
► The limit value is inactive (0) if either the limit for
ON is not yet reached or if, following the
activation of the limit value, the associated
measured quantity falls below the limit for OFF
state again.
Lower limit: Limit for ON < Limit for OFF
► The limit value becomes active (1) as soon as
the associated measured quantity falls below the
limit for ON state. It remains active until the
associated measured quantity exceeds the limit
for OFF state again.
► The limit value is inactive (0) if either the
associated measured quantity is higher than the
limit for ON state or if, following the activation of
the limit value, it exceeds the limit for OFF state
again.
If the limit for ON state and the limit for OFF state are configured to the same value,
the limit value will be treated as an upper limit value without hysteresis.
Limit value states can:
…
directly be used as source for a digital output
…
be used as logic input for a monitoring function
…
be recorded as event or alarm in the appropriate lists on each changing
