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<== Date ==> <== Thread ==>

Subject: Re: Insertion Devices Control and EPICS
From: Dirk Zimoch <dirk.zimoch@psi.ch>
To: TECHTALK <tech-talk@aps.anl.gov>
Date: Fri, 12 Dec 2003 16:52:03 +0100
At SLS, the difference between upstream and downstream encoders (we call it "taper") is monitored by a PLC. The PLC shuts down the motors when the taper becomes larger than 50um. This happens much too often.

Recently, we wanted to raise the speed of out servomotor comtrolled gaps to 1mm/sec. The delay of the 2nd motor became quite noticable. I tried to compensate for that with slightly different acceleration times, so that the 2nd motor could catch up. Unfortunatly, the delay is not completely reproducable. I will try to change PRIO. Maybe that helps.

During the move, the taper stays within a few um, but at the beginning and the end of the move, it is much higher (15 um) and sometimes too high.

I'm desperately waiting for an OMS driver that can handle synchonous moves. I see one problem if encoder readback is provided to the motor record by another EPICS record: two readbacks for one motor record. But if readback goes to the OMS via hardware (as it is here) it should be possible.

Dirk

--
Dr. Dirk Zimoch
Swiss Light Source
Paul Scherrer Institut
Computing and Controls
phone +41 56 310 5182
fax   +41 56 310 4413


Replies:
Re: Insertion Devices Control and EPICS Oleg A. Makarov
References:
Re: Insertion Devices Control and EPICS Bob Dalesio
Re: Insertion Devices Control and EPICS David Maden

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