PP 7i92/C11G problem

connection is offen a real problem on cat5
encloser
here is a example of mine

I'm trying to wire my vfd to the c11g to use on pathpilot. My vfd is a lenze that has start/stop, forward and reverse. I really dont need reverse so should I wire start/stop to relay 3 that is pin 1 or 17? Or could i use relay 2 which is pin 16. Thanks