Experimental Physics and
Industrial Control System

There is no sure way to know if it is the desired value or the default value when the value is 0.
Bob


-----Original Message-----
From: [email protected] on behalf of Abadie Lana
Sent: Wed 2/1/2012 8:25 AM
To: [email protected]
Subject: DRVL, DRVH, HOPR, LOPR

Hi all
I have a question regarding the process of DRVL, DRVH, HOPR and LOPR.
By default, there are all equals to 0.

In the EPICS record reference manual, it is written that some checks are performed if these limits are defined.

DRVH  Drive High            If these values are defined then VAL will forced to be in      
                            the range:                                                     
                              DRVL<=VAL<=DRVH                                        
DRVL  Drive Low                                                                            
HOPR  High Operating        These fields determine the upper and lower display limits      
      Range                 for graphics displays and the upper and lower control          
                            limits for control displays. The fields are used by record     
                            support to honor calls to get_graphic_double or                
                            get_control_double.  If these values are defined,              
                            they must be in the range:                                     
                              DRVL<=LOPR<=HOPR<=DRVH.                             
LOPR  Low Operating                                                                        
      Range    

Questions:
1. how does one (especially the client) know that the limits are really set? And not default values.
2. if it performs a check that HOPR!=LOPR then what if one defines an upper limit (but does not need a low one) and vice-versa.

Thanks
Lana

References:

mvme6100 HW issues? Vesna Samardzic-Boban

DRVL, DRVH, HOPR, LOPR Abadie Lana

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