Simulink If block error "Port 1 must directly or indirectly connect to one If Action Subsystem"

Question

John Harrison 2023-9-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2026634-simulink-if-block-error-port-1-must-directly-or-indirectly-connect-to-one-if-action-subsystem

评论： Fangjun Jiang 2023-9-28

Hello, I am working to use an If block and If action blocks to set shift points for a vehicle model, the code that I am going after would be:

If u1 > 57.3421

6th Gear If Action Block activated

elseif u1 > 46.2345

5th Gear If Action Block activated

elseif u1 > 35.9144

4th Gear If Action Block activated

elseif u1 > 25.6962

3rd Gear If Action Block activated

elseif u1 > 4.2575

2nd Gear If Action Block activated

else

1st Gear If Action Block activated

end

but I keep recieving an error that Port 1 must be connected to an If action block. Any suggestions on how to fix this?

Attached are pictures of the example I was using to build this and the model I

have created.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Fangjun Jiang 2023-9-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2026634-simulink-if-block-error-port-1-must-directly-or-indirectly-connect-to-one-if-action-subsystem#answer_1321139

编辑：Fangjun Jiang 2023-9-28

Outport 1 of the If block is also connected to another destination but it was not shown in the snapshot. Dis-connect that branch and do the same for the rest.

Outputs from the if, else, and elseif ports are action signals to If Action Subsystem blocks. They can't be connected to other places.

2 个评论
显示无隐藏无

John Harrison 2023-9-28

Thank you, I had those ports connected to other If Action subsystem blocks, but after reworking the system so one If port goes to one if Action block it worked.

Fangjun Jiang 2023-9-28

The trigger signals can only be connected to one destination. That was my impression and I suspect that was the cause of your issue. But I couldn't find any statement on this from the Simulink document.

请先登录，再进行评论。