I’ve got a RDC6445G here and a 24V NPN inductive prox switch, green SN04-N. It has an LED that lights on cue.
This channel isn’t reading on the Ruida, as shown on the Diagnostics panel. It’s definitely configured as active-low. I went back and physically measured the voltage on the Ruida terminal and it’s 0v. I’m aware of the confusion of the prox sensor’s “brown, blue, black” convention, but since I measured the voltage I think I’ve got that.
I tried redoing settings a number of ways, and for a short time I DID see the indicator on Diagnostics on on and off when triggering the sensor. But after a reset it didn’t, and I couldn’t recreate it.
I do note that the sensor, although an NPN, did pull up the Ruida pin to 24v when open, so there’s some sort of leakage there. The pins are driven by Ruida at ~4v if left floating with nothing on them. Is the pin able to take this sensor directly if it raises the voltage to 24v? That’s a very common sensor and all the instructions I saw were to wire it straight into the Ruida. Also saw 24v on other limit switch pins that were working fine. I don’t think the problem limit switch channel is physically dead, I swear I saw it respond for a bit. Am I missing some nuance of connecting? I do have its 24v and ground on a busbar shared by Ruida’s 24v supply. But the limit switch’s plug shouldn’t have an isolated ground here.