To which of the 8 available position registers do the “In Position Windows” apply?
These 8 position registers and the 4 "In Positin Windows" are normally used together with FastMac commands.
FastMac is way of communication where one byte can activate several informations and make the motor move in a specified way.
A FastMAC command 64 + 13, can activate a movement using P1 ( Position ), V1 ( Velocity ), A1 ( Acc/dec ), T1 ( Torque ), L1 ( Load factor ) and Z1 ( In Position Window)
So the answer to the question is -
Z1 is used together with P1, Z2 with P2, Z3 with P3 and Z4 with P4.
More detailed information is available in the Technical Manual for MAC050 to 141 in the chapter about FastMAC and FlexMAC.