Experimental Physics and
Industrial Control System

[email protected] (Ned Arnold) · Tue, 24 Jun 1997 14:42:34 -0500

THE BAD NEWS:

To those who are using the calcAo record (not included in base), there has
been a rather nasty bug identified in the record support code.

To fix this bug, find the two lines in the calcAoRecord.c file that read ...

       struct dbAddr       *pAddr = 0;

and replace them with ...

       struct dbAddr       dbAddr;
       struct dbAddr       *pAddr = &dbAddr;

Sorry for any inconvenience.

THE GOOD NEWS:

Starting with EPICS R3.13Beta10, a new record is included in base called 
"calcout" which is identical to its prototype "calcAo". It is similar to
a calc record with the following enhancements :

calcAo compared to a CALC record :

  - Has a built in Output Link that is conditional processed based on the
    calculation result (.VAL). "Conditional" options are
       Every Time/On Change/When Zero/When Non-zero/Change to 0/Change from 0
  - A second calculation field to calculate a different value to send
    to the output link (if desired)
  - Can optionally post an Event in addition to processing the output link
  - Programmable delay before Output execution
  - Output Delay Active Flag indicates "pending" output execution
  - Designed for interactive use.
    - Provides indication of link connectivity
    - Leaves a bad CALC string in the field so you can edit it

	Ned

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System