Re: Home / Limit switches

Here is how the limit switches work on an Ahha controlled machine.

Limit switch at the positive and negative ends of each axis.

Separate inputs for each input into the software.

While Jogging: When the switch at lets say X positive is actuated, it will
not allow further travel in the positive direction, but will allow negative
travel to back off the limit switch. Same for the positive direction.

While running a program: When any limit switch is triggered an emergency
stop is generated, and a message on the screen states that an exception
condition detected and states which input caused the condition.

You can then jog off the switch without powering down and manually moving
the axis.

Homing also utilizes these same limit switches. Which switch for each axis
is selectable in the software (plus or minus)
When homing, the machine will run in the selected direction at a safe rapid
home rate set in the software when the switch actuation is sensed, the axis
ramps down and then moves in the opposite direction until the switch is once
again detected. Whether the home switches are normally open or normally
closed is software selectable for each individual switch.

Bill Griffin
www.grifftek.com/links.htm