Mark_R
Member
Hi everyone,
Been lurking for awhile, figured I'd jump in.
I am designing a PCB which has a 12VDC input from a power supply. (the power supply is an off-board pre-made universal input deal) I need the 12vdc for various industrial I/O uses. I have a voltage reg on the PBC providing 5vdc for a micro controller. The question is; does logic ground ("VSS" I guess) get tied to earth / chassis ground or float?
If it matters, The PCB also has up to 240 VAC present at some locations where field voltage interfaces to the micro via opto-isolators.
This is probably very basic, but I can't find a definitive answer her or via Google.
Thanks.
Been lurking for awhile, figured I'd jump in.
I am designing a PCB which has a 12VDC input from a power supply. (the power supply is an off-board pre-made universal input deal) I need the 12vdc for various industrial I/O uses. I have a voltage reg on the PBC providing 5vdc for a micro controller. The question is; does logic ground ("VSS" I guess) get tied to earth / chassis ground or float?
If it matters, The PCB also has up to 240 VAC present at some locations where field voltage interfaces to the micro via opto-isolators.
This is probably very basic, but I can't find a definitive answer her or via Google.
Thanks.