
The following diagram depicts the four different alarm conditions, as well as the
corresponding hysteresis levels that must be reached to clear the alarms generated for each
condition, in a line chart.
Please note that the diagram uses enumerations to label the hysteresis levels the input value
must reach for each alarm status to be cleared. For example, AL_HIGH_LMT_CLR_2
represents the value necessary to clear the AL_HIGH_LMT_ALM_2 alarm status.
AL_HIGH_LMT_CLR_1 represents the value necessary to clear the AL_HIGH_LMT_ALM_1
alarm status. The data points in your network will not be updated to these statuses at any
time.
AL_HIGH_LMT_ALM_2
CompValue +
UCPThighLimit2Offset=
AL_HIGH_LMT_ALM2
CompValue +
UCPThighLimit2Offset
- SCPThystHigh2
AL_HIGH_LMT_CLR_2 **
AL_HIGH_LMT_ALM_1
CompValue +
UCPThighLimit1Offset=
AL_HIGH_LMT_ALM1
CompValue +
UCPThighLimit1Offset
- SCPThystHigh1
AL_NO_CONDITION
AL_HIGH_LMT_CLR_1 **
CompValue
AL_LOW_LMT_CLR_1 **
Input Value
CompValue –
UCPTlowLimit1Offset
+SCPThystLow1
AL_LOW_LMT_ALM_1
CompValue -
UCPTlowLimit1Offset=
AL_LOW_LMT_ALM1
AL_LOW_LMT_CLR_2 **
CompValue –
UCPTlowLimit2Offset
+SCPThystLow2
CompValue -
UCPTLowLimit2Offset=
AL_LOW_LMT_ALM2
AL_LOW_LMT_ALM_2
Figure 1 Hysteresis Levels and Offset Limits
i.LON 100 Internet Server Programmer’s Reference 7-15
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