[TRNSYS-users] PID controller

Diego A. Arias daarias at wisc.edu
Wed May 3 15:17:35 PDT 2006

Dear Mike,

This message is created when the outputs from a component that is 
updated at the end of a time-step.  Is it possible that you have 
connected the output from an integrator as input to another component?
If this is not the case, please feel free to contact your distributor; 
they may be able to help you.
Best regards,


mike matheus wrote:
> I am creating a project with a PID controller that mixes two air 
> streams to maintain a set hum. ratio, then heats the air mixture in a 
> crossflow heat exchanger.  The mixing of the air streams is controlled 
> by the PID and works well as long as the inputs into the heat 
> exchanger are constant.  When I add a pump onto the hot side of the 
> heat exchanger with varying conditions, the simulation will not run.  
> I get a series of warnings about (TRNSYS Message 315) connection 
> sequences.  Has anybody else had a similar problem with version 16?  
> Any ideas on how to fix it?
> Thank you,
> MIke Matheus
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Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706

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