Grouping Data - The Assembly Mapping Object
The assembly mapping object makes it possible to create an arbitrary number of process data sets, called assembly mappings. Each assembly mapping instance represents a different logical set of process data, that can be chosen by the network and received over a single connection.
Every instance of the assembly mapping object, as seen below, contains an ADI map, referring to an arbitrary number of ADIs.
The instance numbers can be set freely.
Instance # | Type | ADI Map |
|---|---|---|
1 | Read | 1, 2 |
2 | Read | 2, 3 |
10 | Write | 3, 4, 30 |
11 | Write | 4, 5 |
30 | Read | 5, 6 |
51 | Write | 6, 30 |
There are two object instance attributes in the assembly mapping object, called Write PD Instance List and Read PD Instance List. These two attributes contain references to all read instances and all write instances, respectively. The example above will automatically generate the following content in these two attributes.
Name | Attribute | Values |
|---|---|---|
Write PD Instance List | 11 | 10, 11, 51 |
Read PD Instance List | 12 | 1, 2, 30 |
Note
The attributes Write PD Instance List and Read PD Instance List adopts the view of the network, e.g. an input will produce data on the network and an output will consume data on the network.
Write PD Instance List will contain all assembly mapping object instances with type “Read”. Read PD Instance List will contain all assembly mapping object instances with type “Write”.