Logix Designer Application Capabilities and Redundancy State
Configure controller systems for redundant operation, which is the use of multiple similar devices, such that if one fails, the remaining device(s) take over the assigned functions, thus improving the devices' availability. When redundancy is enabled, certain software functions and capabilities are enabled and disabled based on the redundancy state.
The possible controller redundancy states are:
- Synchronized SecondaryA chassis that has a partner primary control chassis, and whose state and data information is synchronized with the primary control chassis. A synchronized secondary is capable of taking control of application programs with minimal impact to the assigned functions.
- Synchronizing SecondaryA chassis that has a partner primary control chassis, and is currently attempting to achieve synchronization. In this state of readiness, a secondary control chassis cannot assume the primary state.
- Locked SecondaryA chassis that presently has a partner primary control chassis and is in a state in which no application changes are allowed on either the primary or secondary controller.
- Locking SecondaryA chassis that presently has a partner primary control chassis and is in the process of locking the Redundancy System in preparation for entering the locked state.
- Synchronizing PrimaryA chassis that has a partner secondary control chassis, and is currently attempting to achieve synchronization.This synchronization could be triggered as a result of a configuration action made withinRSLinx Classic(for example, invoking the Initiate Synchronization command), the use of a MSG instruction, or an auto-synchronization attempt.
- Locked PrimaryA chassis that has a partner secondary control chassis and is in a state in which no application changes are allowed on either the primary or secondary controllers.
- Locking PrimaryA chassis that has a partner secondary control chassis and is in a state in which no application changes are allowed on either the primary or secondary controllers.
- Disqualified SecondaryA control chassis that may have had, or currently has, a partner primary control chassis, but is now incapable of performing a control function if the primary chassis fails
Refer to the table to determine the impact of the various redundancy states on these functions.
This function or capability is disabled | If the controller is in this redundancy state |
Creating or deleting a component (for example, tag, routine) | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Synchronizing Primary Locked Primary Locking Primary |
Editing or modifying component values | Undetermined Synchronized Secondary Synchronizing Secondary |
Setting tag values | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Locked Primary Locking Primary |
Running or stopping trending | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Synchronizing Primary Locked Primary Locking Primary |
Changing controller mode remotely | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Disqualified Secondary (with or without partner) |
Changing or enabling force state (either by enabling, disabling, or removing all forces, or by modifying individual forces) | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Locked Primary Locking Primary |
Downloading | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Synchronizing Primary Locked Primary Locking Primary |
Editing routine logic (including testing, untesting, assembling, and canceling edits, as well as accepting pending edits) | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Synchronizing Primary Locked Primary Locking Primary |
Certain motion commands, such as the Start Motor/Encoder Test, Start Marker Test, and Start Tune commands | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Locked Primary Locking Primary Disqualified Secondary (with or without a partner) |
Disabling nonvolatile memory | Undetermined Synchronized Secondary Synchronizing Secondary Locked Secondary Locking Secondary Synchronized Primary Synchronizing Primary Locked Primary Locking Primary |
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