Logic contains the following components:
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System Blocks that reference another control system
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Logic Blocks that represent functions performed on objects
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Math Category between the Logic blocks
Once a logic process completes, it runs again in approximately 5 seconds. For example, if a logic process starts at 10:00:00 and completes at 10:00:04, it runs again at 10:00:09. It is important that control applications that require particular timing use internal logic to determine time between execution.
If your logic references multiple Engines or multiple ODSs, and one device needs to be downloaded, upload all Engines and ODSs prior to making changes in SCT. This procedure ensures your logic works consistently.