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What events can cause a datapoint's status to be AL_UNKNOWN on the i.Lon100? (KB625)

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What events can cause a datapoint's status to be AL_UNKNOWN on the i.Lon100?

Question Detail
Sometimes I see AL_UNKNOWN as the status from the Alarm Generator on my i.Lon100. What events can cause a datapoint's status to be AL_UNKNOWN on the i.Lon100?

Solution
The alarm type is set to an higher alarm condition after the set time UCPTalarmSetTime is elapsed. The alarm is set to a lower alarm type when the clear time UCPTalarmClrTime is elapsed.
This functionality is recommended for binary inputs like SNVT_switch or SNVT_lev_disc only.

Example 1 Binary Input:
Definition SNVT_switch:

SNVT_switch.value SNVT_switch.state Binary state
100.0 1 ON
1.0 1 ON
0.0 1 OFF
100.0 0 OFF

FN_GT selected; CompValue = SNVT_switch; Data Value = SNVT_switch

Data Value CompValue Alarm Output alarm_type Alarm2 Output alarm_type
OFF ON AL_NO_CONDITION AL_NO_CONDITION
ON ON AL_NO_CONDITION AL_NO_CONDITION
ON OFF AL_INVALID AL_INVALID
AL_OFFLINE ON/OFF AL_OFFLINE AL_OFFLINE
AL_INVALID ON/OFF AL_INVALID AL_INVALID
AL_NUL ON/OFF AL_NUL AL_NUL
AL_ERROR ON/OFF AL_ERROR AL_ERROR
AL_INVALID ON/OFF AL_INVALID AL_INVALID
AL_CONSTANT ON/OFF AL_CONSTANT AL_CONSTANT
ON/OFF AL_OFFLINE AL_UNKNOWN AL_UNKNOWN
ON/OFF AL_INVALID AL_INVALID AL_INVALID
ON/OFF AL_NUL AL_UNKNOWN AL_UNKNOWN
ON/OFF AL_ERROR AL_UNKNOWN AL_UNKNOWN
ON/OFF AL_INVALID AL_UNKNOWN AL_UNKNOWN

Example 2 Binary Input:
FN_EQ is selected ; CompValue is not bound; Default value of CompValue is ON; Data Value =SNVT_switch

Data Value CompValue Alarm Output alarm_type Alarm2 Output alarm_type
OFF ON AL_NO_CONDITION AL_NO_CONDITION
ON ON AL_ALM_CONDITION AL_ALM_CONDITION
AL_OFFLINE ON AL_OFFLINE AL_OFFLINE
AL_INVALID ON AL_INVALID AL_INVALID
AL_NUL ON AL_NUL AL_NUL
AL_ERROR ON AL_ERROR AL_ERROR
AL_INVALID ON AL_INVALID AL_INVALID
AL_CONSTANT ON AL_CONSTANT AL_CONSTANT

This solution applies to the following products:

  • i.LON 100 e2 (Ver 1.1)
  • i.LON 100 e3 (Ver 3.0)

Last Modified:
Solution: KB625

 

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