Hi Martin,
> Unfortunately this seems not to be the case with the PC6K device
> support. MSTA seems not to be updated while the motor is stopped. Can
> this be considered a bug?
Yes, I think so.
I tested the OMS-58 and MSTA does update if the limit is disconnected and STUP is set to 1. It only shows 1 limit, not both, but I believe that is a limitation of the OMS-58 hardware, it only reports the limit switch in the direction of last travel.
I also tested the ACS MCB-4B. When no limits were pressed MSTA was 0x2. When I disconnected the cable and pressed STUP then MSTA changed of 0x2006. So bits 3 and 14 (numbering from 1) were changed from 0 to 1 as expected. It is thus showing both of the limits.
There are 2 drivers for the ACS MCB-4B, a old Model 1 driver and a new Model 3 driver. The test I did was on an IOC running the old Model 1 driver. The PC6K is also a Model 1 driver, so it should be able to update MSTA in response to STUP just like the MCB-4B does.
An important difference I see in the device support for the MCB-4B and PC6K is the following:
devMCB4B.cc
case GET_INFO:
/* These commands are not actually done by sending a message, but
rather they will indirectly cause the driver to read the status
of all motors */
break;
devPC6K.cc
case GET_INFO:
/* These commands are not actually done by sending a message, but
rather they will indirectly cause the driver to read the status
of all motors */
sendMsg = false;
break;
So the PC6K is setting sendMsg=false for the GET_INFO command, but the MCB4B is not. The GET_INFO command is what STUP does. I would suggest commenting out that line and seeing if then the STUP works.
Mark
-----Original Message-----
From: Konrad, Martin [mailto:[email protected]]
Sent: Friday, July 26, 2013 3:07 PM
To: Mark Rivers; [email protected]; [email protected]; [email protected]
Cc: [email protected]
Subject: Re: motor record: continuously update limit switches
Hi!
Thanks for you reply, Mark.
> HLS, RHLS, LLS and RLLS only update when you try to move the motor in
> the direction of the offending switch.
>
> However, the MSTA field will update if you write 1 to the STUP
> field.
Unfortunately this seems not to be the case with the PC6K device
support. MSTA seems not to be updated while the motor is stopped. Can
this be considered a bug?
> Is your goal to make the user aware of the limit status by changing
> something in the GUI?
Yes, exactly. Maybe also for a state-machine that implements some sort
of a calibration procedure.
> It would be nice if HLS, RHLS, LLS and RLLS reflected the actual
> limit status. In fact the motor record documentation is wrong. For
> HLS and RHLS it says:
>
> " If either of these fields is nonzero, then the motor is at the
> positive-limit switch, where the positive sense is that of the
> user-coordinate system for HLS, and that of the raw (step-number)
> coordinate system for RHLS."
>
> That is not true, it does not reflect the state of the switch. It
> only reflects the error status if the switch is hit and the user
> tries to move in the direction of that switch.
@Ron/Tim/Joe: Can you fix the documentation with the next release,
please? And while we're at it: The Documentation website says "Last
modified: June 25, 2003" which is most likely wrong as well.
Thank you very much,
Martin
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