Experimental Physics and
Industrial Control System

"Pearson, MR (Matthew)" <[email protected]> · Fri, 22 Aug 2008 10:14:59 +0100

> 
> Yes, but, *almost*.
> 
> You have no way of knowing whether anybody has moved anything 
> while the IOC was off. Somebody may have taken the whole 
> thing apart and put it back together in which case you really 
> won't know where anything is.
> 

Another example is after a complete power cycle. Any stepper motors
operating in micro/half stepping mode will fall back to their nearest
full step. Or, when the drive amplifier is turned back on, a motor may
move slightly (for example a high current servo motor). It depends on
the application whether or not these matter when the position is
autosaved restored.

Cheers,
Matthew
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System