Difference between revisions of "SAC Examples"

Revision as of 14:25, 6 September 2011

These examples were written in SAC. To run an example, copy the code and paste it into a file called "example.sac". Press File in the Control Software to load the file, and Run to execute it. In the two examples that loop, pressing the Estop will disable the machine and cause the SAC script to exit.

Gcode and Offsets Example

This example shows how to load an offset from the Offsets table in the Control Software, and run a gcode file.

'-------------------Home Machine---------------
Home "Z"
Home "X"
Home "Y"

'----------------Load Origin 1----------------------
retrieveorigin 1

'-------Set spindle,Set Speed&Accel. Move to Offset.-----------
routerauto
accel 25
speed 800
moveto 0,0

'------------------Load File------------------
gcodefile("c:\filelocation\filename1.ncd")
gcodepreprocess
gcoderun

'------------------Load Offset2------------------
retrieveorigin 2

'------------------Load File------------------
gcodefile("c:\filelocation\filename2.ncd)
gcodepreprocess
gcoderun

routeroff

Input/Output Checking Example

This example will check the status of input 14, and will exit when the input goes high.

IOOUT "0","1"
DELAY 2
IOOUT "0","0"

MESSAGE "Waiting for input..."
DO
	' Check the status of input 14 ("Input 6" in Diagnostics)
	' See sac_diagnostics.gif below for a handy diagram.
	IF IOIN(14) = TRUE THEN
		EXIT DO
	END IF
	
	' Check to make sure the machine is enabled
	if active() = false then
		exit do
	end if
LOOP

Properly read the pause button example

This code implements the pause button during moving. It also debounces the pause button which is usually necessary.

dim xpos dim ypos dim zpos dim moving 'moving... 0=no, 1=yes, 2=paused dim startswitch dim pauseswitch dim killflag dim machinepaused mainprogram() public function mainprogram() startswitch=7 pauseswitch=3 xpos=10 ypos=10 speed(100) accel(5) SMOVETO xpos,ypos moving = 1 WHILE (NOT COMPLETEDMOVE) CALL checkpause WEND moving = 0 end function 'this is the end of the small program. Anything below this is a check function. public function checkpause() dim incr for incr=0 to 20 IF IOIN(pauseswitch)=FALSE THEN 'MACHINE IS PAUSED ELSE machinepaused=FALSE EXIT FUNCTION END IF next 'incr machinepaused=TRUE paused() end function public function paused() dim incr halt "YXZ",false moving=2 messagetop "Paused",2 do IF IOIN (startswitch) = TRUE THEN incr=incr+1 else incr=0 end if if incr>20 then unpause() exit do END IF loop end function public function unpause() messagetop "Unpaused",2 machinepaused=FALSE if moving=2 then SMOVETO xpos,ypos moving=1 end if end function

Input/Output With G-Code File Execution

This example is a bit more involved. It runs a gcode file every time the Pause button has been pressed. It also turns on and off an output, and writes a message to the interface.

' This example loads a gcode file
' and runs it every time the user
' presses the Pause button on the
' remote start/stop box.
'
' Any digital input would work, to 
' start the program. We use Pause
' because it's convinent.
'
' Zero the machine where you want
' the gcode to start. Press the
' e-stop to exit the software.
' Remember to re-enable the machine
' before attempting to re-run the
' script. To do so, jog the machine
' and answer Yes to re-enable.
'


' Loads the gcode file
gcodefile "C:\Program Files\Techno CNC Interface v1.421\examples\2box.nc"

' Preprocesses the gcode file
gcodepreprocess

' Loop until the user presses the e-stop.
do

  messagetop "Waiting for Pause press...", 2

  do

    ' Waits for the pause button to be pressed on the 
    ' remote box. The pause button is normally closed,
    ' so we have to read "false" to see a press.
    if ioin(3) = false then 
      exit do
    end if
    
    ' Check to make sure the machine is enabled. Pressing
    ' the e-stop will disable the machine, exiting this loop.
    if active() = false then 
      exit do
    end if

  loop

  ' Check to make sure the machine is enabled. Pressing
  ' the e-stop will disable the machine, exiting this loop.
  if active() = false then 
    exit do
  end if

  messagetop "Running gcode...", 2

  ' Run the gcode file loaded at the start of this script.
  gcoderun

  messagetop "Turning on output 1...", 2

  ' Turns out 1 ON
  ioout "1","1"

  ' Waits 2 Seconds
  Delay 2

  ' Turns out 1 OFF
  ioout "1","0"

loop