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4.5Map Descriptor Example: Read Indications
The following Map Descriptors will read indication words from physical Server Genisys_01 and Genisys_02 (described in Client Side Node Descriptors section).
The Cos_Poller Map Descriptor polls VHLC for any indication word changes and returned data is stored on the Data Array under the COS_READ Map Descriptor for the same Node. The rate of polling is determined by the Scan_Interval.
The Cos_Read Map Descriptor also polls VHLC for all indication words irrespective of data change. The rate of polling is determined by the Scan_Interval.
If Data_Type is Byte, any location in Data Array will hold one indication word from VHLC.
If Data_Type is Bit, eight consecutive locations in Data Array will hold one indication word from VHLC. Also see Appendix A.1.
// Client Side Map Descriptors |
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Map_Descriptors |
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Map_Descriptor_Name ,Scan_Interval ,Data_Array_Name ,Data_Array_Offset | ,Function | ,Node_Name | ,Data_Type | ,Address | ,Length | |||
CMD_01 | ,1.00s | ,DA_COS_01 | ,0 | ,COS_Poller | ,Genisys_01 | ,Byte | ,0 | ,1 |
CMD_01a | ,50s | ,DA_8I_01 | ,0 | ,COS_Read | ,Genisys_01 | ,Byte | ,0 | ,32 |
CMD_02 | ,1.00s | ,DA_COS_02 | ,0 | ,COS_Poller | ,Genisys_02 | ,Bit | ,0 | ,1 |
CMD_02a | ,50s | ,DA_DI_01 | ,0 | ,COS_Read | ,Genisys_02 | ,Bit | ,0 | ,256 |
Frequency (in seconds) to read Indication Statuses
Name of one of the Data Arrays defined in the Data_Array section. Indication statuses will be stored in this Data Array
Starting offset
in Data Array to hold 1st
indication status
One of the Nodes declared in Node Section. Indications will be read from the station address
Number of consecutive locations in the Data array to be used for storing data from the Server.
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