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Appendix A.4.1. Accessing Priority Array information

The Priority Array table and its “In_Use” (or Not Relinquished) state are stored internally to every Map Descriptor, and cannot be accessed directly. The information can

be accessed indirectly by specifying the following Data Arrays which will maintain an exact copy of the Priority Array Table for the Map Descriptor.

Section Title

Map_Descriptors

Column Title

Function

Legal Values

DA_Pri_Array

Name of Data Array where the Priority Array Table will be stored. Location 0 is the Relinquish Default value and

locations 1 to 16 the different entries of the Priority Array Table.

Up to 16 alphanumeric

characters

DA_Pri_Array_Offset*

Starting location in Data Array.

1-65535 , 0

DA_Pri_In_Use

Name of Data Array that indicates if a particular Priority Value is in use. Location 0 indicates whether the Relinquish

Default has been set and locations 1 to 16 indicate whether the index is in use (1), or Relinquished (0).

Up to 16 alphanumeric

characters

DA_Pri_In_Use_Offset*

Starting location in Data Array.

1-65535, 0

// Analog Output Map_Descriptor for testing Priority Arrays

Map_Descriptors

Map_Descriptor_Name

, Object_Type

, Object_Instance

, Function

, Data_Array_Name

, Data_Array_Offset

, Node_Name

, Length

, Relinquish_Default

, DA_Pri_Array

, DA_Pri_Array_Offset

, DA_Pri_In_Use

, DA_Pri_In_Use_Offset

CMD_AOP_1

, AO

, 1

, Passive

, DA_OUT

, 0

, N1 11

, 1

, 40.56

, DA_Pri_Array_1

, 0

, DA_Pri_in_use_1

, 0

Appendix A.5. Relinquishing Control of a Point as a Client

It is possible relinquish control of a point by writing a null to the correct priority level. The following example illustrates how this is done.

Map_Descriptors

Map_Descriptor_Name

, Data_Type

, Function

, Scan_Interval

, Data_Array_Name

, Data_Array_Index

, Node_Name

, Address

, Length

, Write_Priority

, Service

CMD AO

, AO

, Rdbc

, 1.0s

, DA AO

, 2

, N1 1

, 1

, 7

, -

CMD AO Rel

, AO

, Wrbx

, 1.0s

, DA AO

, 3

, N1 1

, 1

, 7

, Relinquish

Map Descriptor CMD AO is a Read

Map Descriptor that will write at

priority 7 if a write-through occurs

Map Descriptor CMD AO Rel is a Write-on-Change

Map Descriptor that will write a NULL at priority 7

(i.e. release Priority Array entry 7) when written to.

Note that the length must be 1.

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 56 57

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