Also to be sure that this part of the code fragment was indeed executed:
If C> P ' trip condition
SetBIT Relay[2],15 ' trip relay
PAUSE
ENDIF
If the PLC pauses after SETBIT you know that it is executed. Now go online monitoring and check if the relay you want to set (it should be relay bit #32 since it is the bit 15 of second relay[] array).
If the relay is set, then release the PLC from PAUSE state by clicking on the PAUSE button. If the relay bit #32 goes off you know it has been turned off somewhere.
Note that if you use a MASTER RESET to reset the PLC, everything is cleared including the relays.