Re: Records for slow control

[Andrew Johnson <anj@aps.anl.gov>]

On 08/24/2015 01:52 PM, info22@online.de wrote:
> I have an ao-record to set/write a value. I also have a timer-record to
> extend the "10 second" SCAN. The idea is to write records which can set
> a value between 0 and 100. 
> 
> For example: 
> Current value: 5 ampere
> Set value: 60 ampere
> 
> -» every 30 seconds +5 till 60 ampere.
> 
> Do someone have an idea?  

Read the record reference manual for the ao record type carefully,
looking at the OROC field (maximum Output Rate Of Change):
https://wiki-ext.aps.anl.gov/epics/index.php/RRM_3-14_Analog_Output

OROC is designed to let you put 60 into the VAL field of your ao record,
and then every time the record processes it will add 5 (the value in
OROC) to the value in the OVAL field (this is the value that actually
gets sent to the hardware) until OVAL==VAL.

You could also create a 30 second scan period if this is a common period
for this particular IOC. To do that, copy the manuScan.dbd file from
Base/dbd to your xxxApp/src directory and edit the file (without
renaming it) to add the extra choice.

HTH,

- Andrew

-- 
Light thinks it travels faster than anything but it is wrong.
No matter how fast light travels, it finds the darkness has
always got there first, and is waiting for it.
    -- Terry Pratchett, Reaper Man