Experimental Physics and
Industrial Control System

Goetz Pfeiffer <[email protected]> · Tue, 4 Nov 2014 13:32:30 +0100

Hi Everybody,

another problem is that DRVL and DRVH seem to be ignored for NaN.

The following record;

record(ao,"UE56ID3R:BaseParGapTrs") {
    field(ASG,"USERCTL")
    field(DRVH,"0.1")
    field(DRVL,"0")
    field(LINR,"NO CONVERSION")
    field(OIF,"Full")
    field(PREC,"4")
}

for example can be set to NaN (at least for Epics Base 3.14.8).

We also found that you can type "NaN" at any entry field in DM2K which
writes NaN directly to the PV.

Greetings

  Goetz Pfeiffer

On 11/04/2014 11:21 AM, Benjamin Franksen wrote:
> Hi Everyone
>
> how do you handle a client writing NaN to an analog record (which
> probably happens by accident)? My intuition tells me that the proper
> response for the record is to go into an INVALID status, but apparently
> this is not what happens by default...
>
> The problem with accepting NaN is that subsequent tests (e.g. via calc
> or sub record) may give wrong results, perhaps leading to motors
> starting to move when they should not (it happened to us, which is the
> reason why I write this).
>
> Cheers
> Ben
> --
> "Make it so they have to reboot after every typo." â€• Scott Adams
>
>
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System