mlevine774 Posted February 19, 2020 Report Share Posted February 19, 2020 Hey! I have a 24V supply on a din rail setup for the PLC/some proximity sensors. I have the V+ connected to the brown wire for the sensors, the V- connected to the blue wire, and the black signal out wire for the sensor is connected to I0 on the PLC. The COM0 is wired to the V- from the power supply as well. The proxy sensors switch/light up correctly and I can see 24V at I0 when i probe I0 and COM0 with a multimeter. The PLC input LEDs don't light up when the switch provides 24V to the input nor does the bit toggle in the software. Is there a wiring/software initialization step for the inputs I may have missed? Thanks! Matt Link to comment Share on other sites More sharing options...
MVP 2023 Ausman Posted February 19, 2020 MVP 2023 Report Share Posted February 19, 2020 Have you missed powering the module itself? cheers, Aus Link to comment Share on other sites More sharing options...
mlevine774 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Hmm, I have the power connected from the supply to the V+/V0/ground on the PLC controller terminal. I also have a V+/V0 connection to the onboard digital outs via terminals 1 and 2 on that side. Do the on board inputs require an additional power connection? If so I do not see terminals called out for that. Advise? Thanks! Matt Link to comment Share on other sites More sharing options...
DanT Posted February 20, 2020 Report Share Posted February 20, 2020 Hi; Looking at the Installation Manual for the USC-B10-T42, Page 10, the wiring you described is for Input wiring, sink Note the description for sink in the note below : Use sink input wiring to connect a sourcing (pnp) device. From this, you have the Inputs wired for PNP Sensors ( and your meter reading appear to indicate PNP -- assuming the 24 VDC input is when the sensor is sensing a target) Are your sensors PNP or NPN ???? -- Make and Model DanT Link to comment Share on other sites More sharing options...
mlevine774 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Hi! PLC model is in the post title (USC-B10-T42) and I'm only using onboard I/O, no additional modules. The 3-wire proximity sensors I'm using are PNP. From SMC and the P/N is D-M9P. I currently have V0 from the power supply connected to the COM0 port to set the inputs up as sink wiring for pnp sensors. So, when sensor sees the actuator piston, it lights up and I measure 24V between the black signal wire and the COM0 terminal. However, the input status LED does not light up on the PLC and the bit in the software does not toggle to 1. Hmmm. - Matt Link to comment Share on other sites More sharing options...
mlevine774 Posted February 20, 2020 Author Report Share Posted February 20, 2020 Hey! Apologies for the confusion guys, turns out I made a foolish error with the physical setup. I hadn't stripped back enough insulation on the input wires and so the PLC terminal was biting that instead of copper! Thanks so much for your time still! My mistake. - Matt Link to comment Share on other sites More sharing options...
MVP 2023 Flex727 Posted February 20, 2020 MVP 2023 Report Share Posted February 20, 2020 Thank you for getting back to us with the solution you found. Link to comment Share on other sites More sharing options...
MVP 2023 Ausman Posted February 20, 2020 MVP 2023 Report Share Posted February 20, 2020 OK Matt. We've all been there at some stage. I suggest that you learn a little about "bootlace pins" and their proper crimpers. cheers, Aus Link to comment Share on other sites More sharing options...
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