Experimental Physics and
Industrial Control System

Michael Davidsaver via Tech-talk <tech-talk at aps.anl.gov> · Tue, 18 Jul 2023 09:29:20 -0700

On 7/18/23 08:57, Mark Rivers via Tech-talk wrote:

Folks,

Does PHAS control the order in which records with PINI=YES are processing during iocInit, even is SCAN=Passive?

Yes.

https://github.com/epics-base/epics-base/blob/42604fc794b6f26b60db953a230b52c1118d3039/modules/database/src/ioc/misc/iocInit.c#L593-L594

  The R7-0 Record Reference Documentation says this:

The *PINI* field specifies record processing at initialization. If it is set to YES during database configuration, the record is processed once at IOC initialization (before the normal scan tasks are started).

The *PHAS* field orders the records within a specific SCAN group. This is not meaningful for passive records. All records of a specified phase are processed before those with higher phase number. It is generally better practice to use linked passive records to enforce the order of processing rather than a phase number.

That seems to imply that PHAS does not apply with processing due to PINI=YES for SCAN=Passive records.

  If this is not true then I suggest the documentation should be changed.

I was going to suggest the same, but realize that I have lost track of
where the appdev guide source lives.  (I personally never refer to it)

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System