Experimental Physics and
Industrial Control System

On Thursday 21 August 2008 15:17, Mark Rivers wrote:

This assumes that the current position information is somehow still

valid,

at least approximately. However, tehre is no guarantee taht this is so

before the motor gets homed. Thus, I agree that soft limits make no

sense

during home operation.

I disagree.  There are other ways besides home to know that a motor is
in approximately the correct position.  For example, there may be
indicators on the motor slides, or one may use a limit switch as a
fiducial.

Save/restore motor positions are another example. If the IOC and
controller have been rebooted, so the motor has not been "homed" in the
memory of the controller or IOC, but the positions are almost certainly
still correct.

Ok, what about a compromise? Add a switch to turn off soft limits during home run.

Cheers
Ben

Users who want/need to do unconditional home search operations can accomplish that at
a higher level than the motor record by temporarily disabling soft limit checks (DHLM = DLLM = 0)
before initiating a home search.

Take care,
Kurt

References:

RE: Motor home status Mark Rivers

Re: Motor home status Benjamin Franksen

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