Zero gain value for S4 of Module Block 8143 FC 15 means that Block 8024 is being ignored
The indicated input block is being ignored because the gain applied to it is 0.0. It does not appear as though the block is doing nothing unless specs are viewed as well. This often indicates a value available for tuning that is currently unused, especially if the input block is a constant.
This message shows a potential error in the system configuration, although most such errors prove to be harmless. It should be reviewed and hidden, unless it shows an issue that should be addressed.
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