Experimental Physics and Industrial Control System
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Title: RE: DRVL, DRVH, HOPR, LOPR
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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ANJ, 18 Nov 2013 |
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