Mapping OPC Variables

The
AADvance-Trusted SIS Workstation software®
 enables the write access from the Workbench OPC portal without restricting access. OPC write for variables can only be allowed from the OPC-specific
Communication
property page. The
Allow OPC Write
 command is only available for user-defined variables or user-defined instances of function blocks.
By default, the following options to map OPC variables are selected (True):
  • Include Server Constants
  • Include Server Functions
  • Auto-include All Variables
When
Auto-include All Variables
 is selected, all of the controller’s variables are added to the list of mapped variables.
cmv_mov
IMPORTANT: When adding or removing individual variables, clear the
Auto-include All Variables
 option.
To map OPC variables
  1. In the
    Communication View
    , expand the required controller, and then expand the
    Workbench & OPC
     element.
  2. Double-click
    OPC
    .
    The
    Communication
    property page displays the variables mapped for
    OPC®
    communication.
  3. In the
    Communication
    property page, select whether to include server constants and include server functions.
    • To automatically include all variables for the
      OPC
       service, select
      Auto-include All Variables
      . Also choose to add all of a controller’s variables by clicking
      Add All Variables
      .
    • To add individual variables to the list, click
      Add Variable
      , and then choose the required variable from the
      Variable Selector
      .
      TIP: After modifying a variable, close and then reopen the OPC Communication property page.
    • To remove a variable, select a variable from the list, and then click
      Remove Selected
      .
    • To toggle the OPC write property for variables, in the
      Allow OPC Write
       column of the visible window, select the required variables.
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