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Producer consumer state machine communication

I'm programming a RT system with 3 drives which are accessed through the scan engine. 
To control the entire system I have a producer state machine ("Command Loop") and for the drives I've created another state machine  ("Motion Loop") which acts as consumer (see picture).
The Motion Loop gets it's Information passed via a RT shared variable fifo. But I would also like some control over the Motion loop when it's idle. 
I've thought about using the event structure but am not sure if thats the best method.

 

I know LV offers several methods for me to communicate between loops, but is there a recommended method for my case?

 Unbenannt.PNG

 

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I don't see anything that is being handled as time critical, so I would just use a queue.


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Hello schpongo,

 

you can use a different framework like this from Delacor, which has the communication options inside

https://www.youtube.com/playlist?list=PLZ3A_SIOKdQs73IjbtaWwCSqoxQfxlWj6

or you can extend the JKI statemachine like wrote with a queue or custom user events or notifiers.

best regards
Alexander
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@crossrulz wrote:

I don't see anything that is being handled as time critical, so I would just use a queue.


I'm not sure whether the communication between my AKD EtherCAT drives and the Motion Loop should be considered as time critical. 
If it is, should I maybe consider using a RT FIFO instead of a queue?

The DQMH structure looks very interesting, but for the moment being I'm a bit short on time to look into it, but thanks for the tip.

Daniel

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I'm not sure whether the communication between my AKD EtherCAT drives and the Motion Loop should be considered as time critical. 


Can you show me the communication code mentioned here?

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Hello schpongo,

 

now we are on a point where it is important to know what you want to do, becasue RT FIFO makes only sense, when also a timed loops will be used typical this means you want to make a controled closed loop.

 
best regards
Alexander
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Use “User Events” to communicate into the Event Structures of your JKI “state machines”.  Use one User Event each, containing a cluster of a string (command) and a variant (data).

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My current concept is based on one controlling loop which interpenetrates different user commands and commands which are read form a text file. 
All the hardware which I need to control is supposed to be modeled as state machine. 

The Motion loop is supposed to control 3 AKD drives via EtherCAT. Thus I thought about putting it in a timed loop so I could more tightly control how fast it runs maybe sync it to the scan engine rate.

 

At the moment I only plan to use the queue to initiate different automated processes for each of the state machines. So that they are in an idle state until they receive a certain command and then loop through different states.

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