Reference the Controller Log
A controller log is a record of changes, including changes made in programming software, controller keyswitch interactions, and events. The log is stored on the NVS memory of the controller automatically. You can move the log to a memory card as needed or automatically at predefined times. The NVS memory of the controller and each external memory card type has a maximum number of entries that they can store.
For more information about controller logging, see the Logix 5000 Controllers Information and Status Programming Manual, publication 1756-PM015.
Redundancy System Considerations
Because redundancy systems operate with partnered controllers, there are considerations that you must consider regarding controller logging:
- The primary and secondary controllers maintain separate logs.
- You do not need to synchronize the logs.
- On the primary controller, controller logging occurs exactly as it does on a controller in a non-redundant system, regardless of whether the system is qualified and synchronized or disqualified.
- A secondary controller logs the removal or insertion of a memory card, in any operating state. Otherwise, the secondary controller only logs events that occur when the controller is in a disqualified state.
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