CHAPTER 4: CREATING A STRATEGY WITH CONTROLLER REDUNDANCY
SNAP PAC Redundancy Option User’s Guide
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The Configure Variables dialog box opens.
3.
In the Type drop-down list, choose the type of variable you want to configure.
4.
If you are adding the variable to a subroutine, select Subroutine in the Scope drop-down list.
5.
Click Add.
The Add Variable dialog box appears.
Persistent/Redundant
variable option
6.
Name the variable, select the type, and under Initialization, select Persistent/Redundant.
7.
Click OK.
The Add Variable dialog box closes and the new variable appears in the Configure Variables
dialog box.
Step 4. Designing a Transactional Chart
NOTE: Before you begin, make sure to enable the redundancy features in PAC Control. (See
This section describes the basics of how to design a
transactional chart
, a special PAC Control chart
that you must use if your strategy is used to support persistent/redundant data with redundant
controllers. You create a transactional chart simply by adding sync blocks at strategic places in a PAC
