Gain block ignored :

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Doug Bell
Doug Bell 2018-8-1
评论： youjarr 2021-5-7
I have a Simulink model with a gain block that has a ToWorkspace before and after, yet the ToWorkspace traces are identical even though the gain has been set to 64, any ideas what may be causing this?
  1 个评论
Jim Riggs
Jim Riggs 2018-8-1
Need more information. What are the settings in each "To Workspace" block?
Variable Name
Data limit
Decimation
Save Format
Sample time

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回答（3 个）

Fangjun Jiang
Fangjun Jiang 2018-8-1
The input value to the Gain block is constant zero? Need more info to see the problem.
  2 个评论
Doug Bell
Doug Bell 2018-8-1
thanks Fangjun - it needed a convert datatype block prior to the gain block , it was a Boolean flag toggling between 0 & 1, then multiplied by a power of two, converting to a float before the gain seems to have fixed it
Fangjun Jiang
Fangjun Jiang 2018-8-1
Without the data type conversion block, the output should still be 64 when the input is boolean true, right?

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Doug Bell
Doug Bell 2018-8-1
that was the assumption but it took the datatype conversion block to get what I wanted
youjarr
youjarr 2021-5-7
Hey Guys,
I have an similiar issue.
I have an Signal which is not 0. Then I put an 0 Gain to it... with an parameter which is read from the base workspace.
That value is 0 so I would thing the output of the Signal*0 is 0... but it isn´t it has the value of the signal.
But when I write the 0 directly into the gain hen it works and the output is 0.
The datatype conversion has no effect... .
  2 个评论
Fangjun Jiang
Fangjun Jiang 2021-5-7
You are saying that you have a Gain block, its "Gain Value" is a parameter from the base workspace, the value of the parameter is 0, yet, the output of the Gain block is non-zero.
It is strange. I would double check the value of the parameter, the name of the parameter, lower case, upper case, etc.
There is a chance, that there is a parameter with the same name, in the model workspace, its value is non-zero. The variable in the model workspace takes precedent over the base workspace, if their names are the same.
youjarr
youjarr 2021-5-7
You were right. Somehow I saved a value in my model workspace.
Thank you very much.
Have a nice weekend.

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