Load-Sharing Notes
The following table describes interactions specific to a block with load-sharing redundancy, which is described in Load-Sharing Redundancy.
Area
Description
Linked Data
A load-sharing redundant block cannot be linked to an item in another module.
Linked Diagrams
A load-sharing redundant block cannot be linked to another block diagram.
Repeated Blocks
A load-sharing redundant block cannot have repeats or be a repeat of another block.
Junctions
A load-sharing redundant block cannot be an input to a load-sharing junction.
When one of the components represented by a load-sharing redundancy block fails, the stress on the other components represented by this block rises according to:
The load life relationship specified for the block on the Redundancy page in its Calculation Properties window. For more information, see Block Calculation Properties.
The relative weights of the components.
The total load being shared.
Specifically, the effects on the remaining online components are as follows:
The load on each component increases.
Each component's failure rate increases.
Each component ages at a faster rate.
Additionally, the capacity of each component increases with the load at a 1-to-1 ratio as described in Capacity. When the number of online components sharing the load drops below the value specified for Quantity Required on the Redundancy page in the block’s Calculation Properties window, the path is considered failed. Thus, the system may fail. However, if Components continue to operate is selected on the Advanced page for RBD calculations in the Calculate window, any of the online components remain online. For more information, see Advanced Page.