Hi lizard,
Yes, your 0V would go to the common on the PLC input. This would be NPN.
http://www.plctalk.net/qanda/showthread.php?t=27796
" The S/S terminal is used to configure the unit inputs for sinking or sourcing signals (all at once).The inputs themselves are polarity-insensitive and S/S is their common.When the S/S is connected to the logic ground, the inputs react on sourcing signals (PNP sensors).When it is connected to the logic power (typically +24VDC) the inputs react on sinking signals (NPN sensors). "
Here is the hardware manual: https://dl.mitsubishielectric.com/dl/fa/document/manual/plc_fx/jy992d66301/jy992d66301s.pdf
I hope this helps you out.
Regards,
Garry