282 Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
Appendix F Enhanced Redundancy System Checklists
Scan time is minimized by using these techniques when possible:
• Unused tags are eliminated.
• Arrays and user-defined data types are used instead of individual tags.
• Redundancy data is synchronized at strategic points by using the Synchronize Data after Execution setting in the Program Properties dialog box.
• Programming is written as compactly and efficiently as possible.
• Programs are executed only when necessary.
• Data is grouped according to frequency of use.
• DINT tags are used instead of SINT or INT tags.
For produced/consumed data, the communication module in the remote chassis that holds the consuming controller uses the Comm Format: None.
Critical messages from a remote chassis to redundant chassis use cached connections.
Active tags on scan per controller are less than 10,000 tags/second.
(1) Note that the project loaded on the primary controller is automatically crossloaded to the secondary controller when sychronization occurs.
 Requirement
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