Hi chaps, sorry if this has been answered before but I've had bit of a search without spotting it... I have an old FX0S which is used to control some pumps and heaters. The heaters are 3kw and switched by SSR. Ideally I'd like to verify that mains is not present when the SSR is signalled off (IE hasn't failed short circuit). Is there a simple way to detect 240V AC with the PLC's input? I could use a relay but there must be some kind of opto-isolator solution that would be more elegant? Regards, Tony
