Hi Rajdzos,
The 3ND883 manaul states that if ENA termial left unconnected will make the drive enable. So, if you want to enable the drive at all time, then leave it unconnected.
However, you want to implement a safety to your system. it is suggested to implement the enable or disable function through Estop circuit. Because it is better to have software independent. In this external Estop circuit, you can have second switch or relay contact that send feedback to the software side when the Estop is pressed.
It is suggested that to obtain a 5-volt source from terminal 5V and 0V on the MB3 board. Becuase the VCC-GND is reserved for ESS board and small current consumption circuits.
for Mach4 signal configuring and mapping please see the following link.
https://warp9td.com/index.php/faq/fa...alDescriptions