Experimental Physics and Industrial Control System
I think the first thing you need to do is to figure out what is wrong with the MAXv. There has been a recent discovery of problems with MAXv modules occasionally not being available when the system boots, but I believe that will hang the boot process, so should not lead to the problem you are seeing. What do you mean by "crashes"? Was it working at all during that boot of the IOC?
The problem with save/restore is harder to solve. One way to do it is to note when the MAXv crashes, and just manually edit the auto_positions.sav file before rebooting again to put in the last known good values from a periodic backup or the last good boot. But if the MAXv worked for a while before crashing during the current boot, that may not be possible.
Mark
________________________________
From: [email protected] on behalf of ???
Sent: Sun 5/9/2010 11:12 PM
To: [email protected]
Subject: AutoSaveRestore of the motor position
Hi,everybody,
In SSRF beamline control we use the autosave module to save the 'DVAL' field and restore the value of a motor position when rebooting.
Recently we encountered a problem.
Sometimes one of the controllers(MAXv-8000) in a VME crate crashes while the IOC(mvme5500) still runs. Because the motor channel is still connected, the system looks OK. In this case if changing the 'DVAL' field to drive the motor, the controller doesn't response and the 'DRBV' of the motor keeps unchanged. So the saved value 'DVAL' isn't no long the motor real position.
When hard rebooting the VME crate, the 'DRBV' set by the recovered 'DVAL' doesn't match the motor real position.
Are there some problems in our saving and restoring method? How to deal with this kind of problem?
Any suggestion will be greatly appreciated!
===================================================
Zhang Zhaohong(???)
No.239 Zhangheng Road
PuDong District
Shanghai Institute of Applied Physics CAS
Shanghai, China
Tel: +86-21-33933238
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