DIYbanter - View Single Post

wrote in news:1127499300.458419.75650
@o13g2000cwo.googlegroups.com:

No fault bus at all, but the step/direction servo drives
will fault and some software will halt the motion of all axis if an axis
faults, some will not

This is where the MCU based servo drives shine and are destined to be
the state of the art IMO. Software is not required to halt operation
when any axes faults. In fact the software doesn't even know a fault
bus exists. Each drive is connected to the fault bus via open drain
inputs. When any drive detects a fault associated with the motor it is
driving, it will switch its input to output and pull the bus low
causing all other drives to fault. This all takes place in 3 or 4 clock
cyles so it's practically instantaneous.

Yes, agreed. I've tried to do something similar and link each drivers state
into the E stop. Crude at best, but while it still might break an endmill
it would save the part if you where lucky. Gecko is/has? developed a box
that sits between the controller and the drive with an MCU that does most
of what you suggest along with other stuff.