Experimental Physics and
Industrial Control System

In general, for analogue output it does seem that
caching is probably the best way forward. However, there are 
situations where queueing rather than caching would be required.

eg:
An mbbi output requesting processing through a sequence of states
   this could be as simple as a device that needs to be switched 
   off the on again in oreder to reset it.

Taking backlash off a motorised component.
   or any other device where a transient peak was required.


Perhaps some mechanism similar to the deadband used 
in ai records could be used to discriminate. 

Pete.

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