OPC UA Server Symbols Configuration
Symbols are the items of data shared with OPC UA clients. Symbols are selected from a list of all the IEC variables used in the application. The selected symbols are then sent to the logic controller as part of the application download.
Each symbol is assigned a unique identifier. As certain client types may require a specific format, identifiers can be configured to be in either string or numeric format.
The OPC UA server supports the following IEC variable types:
oBoolean
oByte
oInt16, Int32, Int64
oUInt16, UInt32, UInt64
oFloat
oDouble
oString (80 bytes)
oSbyte
Bit memory variables (%MX) cannot be selected.
Displaying the List of Variables
|
Step |
Action |
|---|---|
|
1 |
On the Applications tree tab, right-click Application and choose Add object > OPC UA Symbol Configuration. Result: The OPC UA Symbols window is displayed. The logic controller starts the OPC UA server. |
|
2 |
Click Add. |
NOTE: The IEC objects %MX, %IX, %QX are not directly accessible. To access IEC objects you must first group their contents in located registers (refer to Relocation Table).
Selecting OPC UA Server Symbols
The OPC UA Symbols window displays the variables available for selection as symbols:
Select IoConfig_Globals_Mapping to select all the available variables. Otherwise, select individual symbols to share with OPC UA clients. A maximum of 1000 symbols can be selected.
Each symbol has the following properties:
|
Name |
Description |
|---|---|
|
Symbols |
The variable name followed by the address of the variable. |
|
Type |
The data type of the variable. |
|
Access type |
Click repeatedly to specify the access rights of the symbol: read-only ( NOTE: Click in the Access type column of IoConfig_Globals_Mapping to set the access rights of all the symbols at once. |
|
Comment |
An optional comment. |
Click Refresh to update the list of available variables.
) (default), write-only (
), or read/write (
).