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A.7.4. Responses to Polls for Object 80 (Internal Indications)
If a remote client polls for object 80 then the FieldServer needs to be configured with an object 80 Server Map Descriptor.
The length of the Map Descriptor determines the number of bits in the response and hence the number of bytes. A whole number of bytes is always sent so if configured with a length that isn’t a multiple of 8 then the driver appends extra
Example: This map descriptor responds with 2 bytes of data. 10 bits of the two bytes are extracted from the DA_80 and 6 of them are padded with a state of zero to make a whole number of bits. The driver extracts the bits from consecutive elements of the Data Array. Thus with a length of 10, the driver looks in 10 consecutive elements of the Data Array.
Map_Descriptors |
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Map_Descriptor_Name | ,Scan_Interval | ,Data_Array_Name | ,Data_Array_Offset | ,Function | ,Node_Name | ,Address | ,Length | ,dnpSubType | ,dnpDataType | ,dnpDataVari | ,dnpQualifier |
MMBa1 | ,0.5s | ,DA_80 | ,0 | ,Server | ,Node_A | ,0 | ,10 | ,value | ,80 | ,1 | ,Zero |
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