Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Fri, 14 Mar 2014 14:05:45 +0100

Hi Emmanuel

On Thursday, March 13, 2014 15:58:44 Emmanuel Mayssat wrote:
> I have a recordAO (let's say a phase in deg) that is converted through
> a cvtRecord (~ breakpoint table) to a voltageAO. We could assume that
> the voltage on the device doesn't change while the IOC is off and
> autosave everything.
>
> But... in this particular case, where the hardware 'remembers' its
> voltage setting (EEPROM or hardware stays on while IOC is off), the
> chain above should be executed in the opposite direction at iocInit.
> A possible way is to have another cvt record with the same
> "breakpoint" table but with "1D table reversed" method and PINI=1. Is
> this the recommended way?

I did not have this problem in practice yet, but yes, this is how I
would do it. You might need some additional record logic that disables
the readback and reverse-conversion after the first (PINI) processing.
You might also want to disable processing in the forward direction
during the readback (this might be necessary if setting a value to the
device has other side effects that you want to avoid).

Cheers
Ben
--
"Make it so they have to reboot after every typo." ― Scott Adams

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System