Problems of Timing Simulation Interface Toolkit Custom IO
I implement a model of .dll Simulink (execution with a stage of integration of 50ms) with SIT in real time and need to communicate via UDP to another device sockets two-way such that all packets are sent from one to the other in-sync and respecting the time constraints of my loop of base fare.
To repeat: in the designated for playback in the basic loop vi rate that is generated with Connection Manager, I block structure UDP listening on different ports for my other camera packages (non - OR) and to introduce data in the .dll file, and similarly the structure designated for writing I will send packets to this device. Think that the control loop.
I have not yet started to implement this because I realize that when these two asynchronous devices are listening/sending packages will not be at the same time I don't have a synchronization mechanism. I do not think that they must stay synchronized each interval of 50ms, but problems with drift, I should address later.
For a first cut, where can I implement a block that will sit and wait indefinitely until my other device not - NOR sends a packet of synchronization of a certain type then 'kick-off' iterations of 50ms of the original model with a known relative chronology.
Or is there a better way to handle this? I think this would be a common problem for simulations involving control loops. How is it usually implemented in OR in real time with SIT?
Hi gdubb85,
You should be able to do this by adding a while loop outside your VI driver with a wait until the next ms Multiple set to 50 m in this loop, you can listen to with a reading of the UDP packets and send the data you receive to help a functional global to your model.
Kind regards
Stephen S.
Tags: NI Software
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The best help for would be a description step by step from a VI of work using sinewave.mdl inside LabVIEW with ready to use sinewave.dll.
I need to examine any document in order to complete this example?
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Hi Jan,
Yes it s a target VxWorks.
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