Experimental Physics and
Industrial Control System

Pete Jemian <[email protected]> · Thu, 5 Sep 2013 14:57:14 -0500

What sets the value of "foo" so that it passes the test for true?

On 9/5/2013 2:54 PM, Konrad, Martin wrote:

Hello,
I am using a state machine to control a motor setup. In each step it
basically sends a command to the motor record and waits for it to
complete. This can be detected by the "done moving" field (DMOV).

Here is how I implemented this:

state1 {
    entry {
      sprintf(stateMsg, "state 1");
      pvPut(stateMsg);
    }

    when(foo) {
      motor = bar;
      pvPut(motor, SYNC);
    } state state2
}

state2 {
    entry {
      sprintf(stateMsg, "state 2");
      pvPut(stateMsg);
    }
}

Unfortunately this leads to a long delay between the motor starting to
move and the update of the status message (sometimes 10 seconds!).

I suspect I'm using sequencer the wrong way here. Are synchronous pvPuts
necessary to make sure the command has been send to the motor record?
Should I move the pvPut line to the end of the entry block of state2?
Are there some best practices how to keep the state machine code clean
and readable?

Thanks,

Martin

--
----------------------------------------------------------
Pete R. Jemian, Ph.D.                <[email protected]>
Beam line Controls and Data Acquisition, Group Leader
Advanced Photon Source,   Argonne National Laboratory
Argonne, IL  60439                   630 - 252 - 3189
-----------------------------------------------------------
   Education is the one thing for which people
      are willing to pay yet not receive.
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System