M16 & Pokeys wont thread

I have a cnc lathe controlled with a M-16 with the Pokeys 57e .I am using a Lichuan AC servo and Lichuan B-2 drive to control my spindle .Currently I can not thread . I can control the the spindle speed and direction . I am using G76 for threading and once the machine gets to the second line of G76 all motion stops with no error codes. I do have an encoder connected and index is mapped in Mach4 .When I check the diagnostics page the light for index dose not blink .If I set index as active low light is on constantly and never blinks if I uncheck active low light never comes on .I really need some help to get this fixed .If someone has a m16 running an encoder can you please tell me if the index light blinks on the diagnostics page Thank you