Now there are many pressbrake of cnc control in China  

The most popular is 4+1 which means Y1 Y2 X R +V 

Y1 Y2 are for the stroker for the pressbrake bending force direction and X for stop the material and R for rise the backgauge  

And the V is mechnical defelction for the bended metal sheet  

Another is 6+1  Y1 Y2 X R Z1 Z2 +V  

Y1 Y2 are for the stroker for the pressbrake bending force direction and X for stop the material and R for rise the backgauge  

And the V is mechnical defelction for the bended metal sheet  

Z1 Z2 is for the backgauge horizontal stop the material  

As the follow :