Experimental Physics and
Industrial Control System

Ian Smith <[email protected]> · Fri, 28 Jul 1995 14:19:30 +0100 (BST)

I'm experiencing some strange effects when I have the ACCL field set to 
say around 6 seconds, though 3 seconds also exhibts the effect.  If I
request a small move the motor moves but the MPOS field doesn't update.  
If I asked it to go to the same position the motor moves a bit more and 
MPOS updates.  If I ask a 3rd time the motor doesn't move but MPOS updates 
to 2x the original distance.  If I ask a 4th time the motor moves back to 
where it should be and MPOS is continuously updated. ie:

Demand Position		Position		MPOS

92000			92000			92000 1st (long) move, ok 

92050			92050			92000 move ok, frozen MPOS

92050			92100			92050 unexpect 2nd move 

92050			92100			92100 no move, MPOS updates

92050			92050			92050 motor moves back,
						      MPOS continuously updates

If I set the ACCL parameter to 1 second then everything behaves as one 
would expect.  The other parameters are:

OMSL supervisory	VELO 1.5	MRES 1000	RTRY 0

Any ideas before I dive into the code?  The problem could of course be in 
the OMS firmware.

Ian A Smith			Telephone: +44 (0) 131 668 8257
Royal Observatory		Fax:       +44 (0) 131 668 1130
Blackford Hill			Web:       http://www.roe.ac.uk/
Edinburgh
UK

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System