Power cord adapter

I have a situation where I have just purchased a PLC for my VPI HW19. The power cable from the stand alone motor is a 3 prong cable (earthed) The female connection into the PLC is a 2 prong socket(unearthed?) I need an adapter ; a 3 prong female to a male 2 prong. Does such a beast exist. my situation is compounded by the fact that I'm in Australia. TIA