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4.4.5.Map Descriptor Example 2 – Simple Read – Extract the Quality/Status
In this example the status data rather than the input values are written to the data array specified.
//Client Side Map Descriptors
Map_Descriptors |
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Map_Descriptor_Name | ,Data_Array_Name | ,Data_Array_Offset | ,Function | ,Node_Name | ,Address | ,Length | ,Scan_Interval | ,dnpDataType | ,dnpDataVari | ,dnpSubType |
A1 | ,DA_AI3STAT | ,20 | ,Rdbc | ,Node_A | ,20 | ,10 | ,5 | ,30 | ,1 | F,lags |
The results of the | DNP Object Type is | DNP Object Variation is |
read are placed in | Analog Input | 16 Bit Analog Input |
this data array. |
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Tells the driver to write the status byte to the data array, ignoring the value of the object being read. You can use value / time1 / time2 / flags / combo as legal values for this parameter. The default is value.
Not all objects have these
4.4.6.Map Descriptor Example 3 – Simple Read Extract Value & Status
In this example we extract both the value and the status using two Map Descriptors.
// Client Side Map Descriptors |
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Map_Descriptors |
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Map_Descriptor_Name | ,Data_Array_Name | ,Data_Array_Offset | ,Function | ,Node_Name | ,Address | ,Length | ,Scan_Interval | ,dnpDataType | ,dnpDataVari | ,dnpSubType | ,dnpAsscoiate |
A1 | ,DA_AI3 | ,20 | ,Rdbc | ,Node_A | ,20 | ,10 | ,5 | ,30 | ,1 | ,Value | ,1 |
A2 | ,DA_AI3STAT | ,20 | ,Passive | ,Node_A | ,20 | ,10 | ,5 | ,30 | ,1 | ,Flags | ,1 |
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The status data is placed into a different array from the value data.
Only one Map Descriptor need be active. The active Map Descriptor generates the poll. Both the active and passive Map Descriptors are used to process the response.
The common value for dnpAssociate ties these two Map Descriptors together and tells the driver to use them both to process the response data.
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