Experimental Physics and
Industrial Control System

Ned Arnold <[email protected]> · Tue, 28 Sep 2010 15:20:44 -0500

Andrew -

It is not uncommon to break the expression up between multiple calc records to work around the length limitation.  You can put those floating point constants in spare inputs ... and then have a second calc that returns "(235>B && 5>D && 5>E)" to another input ... and I think you will fit.

   Ned

On Sep 28, 2010, at 3:11 PM, Mark Rivers wrote:

> I suspect your CALC expression is longer than 40 characters and that is
> the source of the error.
> 
> Mark
> 
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Andrew Wagner
> Sent: Tuesday, September 28, 2010 3:04 PM
> To: [email protected]
> Subject: CALC expression
> 
> Hey everyone, 
> 
> I need to evaluate a somewhat complicated conditional statement in a
> calc record. Presently I need to evaluate: 
> 
> field(CALC, "(235>B && 5>D && 5>E) ? (B*0.00835 - 0.7 > A + (C-B)*0.25
> ? B*0.00835 - 0.7: A + (C-B)*0.25): 0")
> 
> where the letters are input variables. When I load the record I get the
> error
> 
> Can't set "VOLT:PID.CALC" to "(235>B && 5>D && 5>E) ? (B*0.00835 - 0.7 >
> A + (C-B)*0.25 ? B*0.00835 - 0.7: A + (C-B)*0.25): 0"
> Error at or before ")" in file "MagnetCtrlApp/Db/MagnetCtrl.db" line 113
> 
> Does CALC not support nested evaluations? Perhaps I need a subroutine
> record? Any advice would be greatly appreciated. 
> 
> Cheers, 
> 
> Andrew
> 
> 
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System