• Need to add a button on main screen of Tomas2 profile instead of “CV” button.
• The button should toggle output #6
• The button should have built-in LED indicator to show current Output Pin state.

The button code in cnc-screen.xml will look as

  <gitem where="work-toolbar" type="xbutton" height="60" 
  image="outputs/transistor-off" action="soft-plc-run:__TR"  
  xattr="2;38;20;20;led;green;round" address="outputs" number="6"/>

• where=“work-toolbar” - Widget name to put the button
• type=“xbutton” - Type for button with buil-in LED indicator
• height=“60” - Size for button. It's supposed square button if No “width” attribute given
• image=“outputs/transistor-off” - Skin image for the button
• xattr=“2;38;20;20;led;green;round” - Built-in Led indicator type, color, position and size
• address=“outputs” number=“6”- Address (inputs or outputs) and pin number to show state

Software PLC procedure source code to toggle output pin will be as follow

main()
{
 
  a=portget (0x406); //read current state of output #6
 
  if (a==0) {portset(6);} 
  else {portclr(6);};
  exit(99);
 
};

To add Software PLC procedure -

• Go to Software PLC tab
• Press + (Add) button and enter PLC procedure name
• Fill the procedure source code
• Press 2 buttons on the right - Build All and Save to save sourece code and build PLC binary file