Most drives inclue the Dynamic Braking transistor so the external braking resistor will be wired between the PA and PB terminals.
There will either be a jumper or a DC choke connected between PA and PO. It is important to make sure this is not removed because the drive will not function without it.
For the ATV12 and for high horsepower drives (ATV61, ATV71) an internal transistor is not included and would have to be added to the drive as an external module.
Consult your specific drives Installation manual for details.