Disable Positive Limit or Change Limit Port

[nhcnc]

Hello,

I'm retrofitting a CNC where all the +Limits X/Y/Z/Tool Turret and Home switches are shared to a single pin. The problem I'm having is the tool turret hits the home switch/shared+ limit when indexing to past tool 1 causing UCCNC to stop and go into reset and abort the change.

What I want to do is disable the + limits temporarily while the Turret is changing tools. Is there a code to disable the limits or an example of how to redefine the ports and pins for the +limits in a macro?

I tried toggling the Ignore Limits in the macro but it still stops when it hits the limit/home switch.

[nhcnc]

Does this seem to be a legit solution or is there a better way?

Code: Select all

/**********************************************Limit Fix Begin*************************/
//Save the ports and pins for the positive limits
string XPosPort = AS3.Getfield(244);
string XPosPin = AS3.Getfield(4);
string ZPosPort = AS3.Getfield(254);
string ZPosPin = AS3.Getfield(34);

//Set all the ports and pins to zero to disable + limits
AS3.Setfield(0,244);
AS3.Setfield(0,4);
AS3.Setfield(0,254);
AS3.Setfield(0,34);

//Apply Changes
exec.Callbutton(168);
MessageBox.Show("Ports and Pins Set");

/**********************************************Limit Fix End*************************/



/********************************Reset Pins Begin *******************************/
//Set all the ports and pins back to enable + limits
AS3.Setfield(Convert.ToDouble(XPosPort),244);
AS3.Setfield(Convert.ToDouble(XPosPin),4);
AS3.Setfield(Convert.ToDouble(ZPosPort),254);
AS3.Setfield(Convert.ToDouble(ZPosPin),34);

//Apply Changes
exec.Callbutton(168);

MessageBox.Show("Ports and Pins Reset");
/********************************Reset Pins End *******************************/



[fsli]

Couldn't you just use a different input for the turret?

[dezsoe]

After Setfield you should call Validatefield too. But it will not work, because you normally want to change tool while a g-code is running, but you should never call Apply or Save while cycle is started. You need to use a different input for that home switch or if you don't have any more then you may use an output to drive a relay to temporary bypass that home switch.

[nhcnc]

I’d rather not modify anything on the machine side, the current implementation is plug and play with the oem controller. The relay idea might work if there is no other solution.

[dezsoe]

You can simply set an output trigger for LED 28 (Toolchangeinprogress) to control the relay.