Experimental Physics and
Industrial Control System

"Pearson, Matthew R." <[email protected]> · Thu, 10 Sep 2015 14:16:01 +0000

> 
> My Problem:  Let's say the current value (hardware device) is 8 V. If I I restart the IOC and put a new value like 10V i want to continiou ti increase 8, 9, 10V. But The after restarting the IOC my first Calc-Value is 0. 
> 

One way might be to write the current hardware value into the calcout record at IOC startup. 

You can also initialize the record that writes the value to the hardware with the hardware readback at IOC startup, by adding this to the write function in the stream protocol file:

setVoltage {
   out "SETV %f";
   @init { getVoltage; }
}

where getVoltage is the protocol function to read the current hardware setpoint. This is often what you want, since the hardware may have changed since the IOC was last running (so autosave won't help). Then you can read this record into the calcout record.

You might be able to do the ramp in database logic, but using SNL will give you more flexibility.

Cheers,
Matt

> 
> Current Value: 8V
> ‎SetVolt: 10V
> Calc: 0, 1, 2, 3, 4 ... 10. 
> 
> 
> Is there other possibility? And my second problem is I want to make a seq-record to increase after 30, 60 and 90 seconds.
> 
> For example (epics and css): 
> User Volt Selection: 1000V, 1500V and 2000V 
> User Slew Rate Option: 5V, 10V, 15V / per Time
> ‎Time: 30 seconds, 60 seconds, 90 seconds
> 
> 
> 
> record(ao, "SetVolt") {
> field(EGU, “V”)
> field(LOPR, “0”)
> field(HOPR, “28”)
> field(DRVH, “28”)
> field(DRVL, “0”)
> field(VAL, “0”)
> }
> 
> record(ai, "SetVoltReadback"){
> field(DTYP, “stream”)
> field(INP, "@xyz.proto read($(xyz)) $(device)")
> field(SCAN, “1 second”)
> field(FLNK, "VoltCalc PP")
> }
> 
> record(calcout, "VoltCalc") {
> field(DESC, “Write Voltag Out”)
> field(SCAN, “1 second”)
> field(CALC, "A:= ((C<(A-B)) ? (A-B) : ((A+B)>C ? C : (A+B)));A")
> 
> field(INPA, "VoltCalc.VAL")
> field(INPB, “SlewRate”) /* standard:1 */
> field(INPC, "SetVolt")
> 
> field(OUT, "WriteOut.VAL PP")
> field(OOPT, “On Change”)
> field(DOPT, “Use CALC”)
> }
> 
> 

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System