Open Collector Output interface to 24V Digital Input, Inverted

Easyest thing is to use the opto transistor output to the input of your 24V din rail device (You dont say what this is so I will assume it has a 24V logic input ) If your input device needs a pullup then something like a 10K resistor should suffice to 24V from the collector of the opto / input to your device. this will ensure the input is 24V or 0 depending on state of stepper

Without knowing what your input device is, it is hard to say. some industrial devices have internal pullup, some dont and some have a lower input impedance so 10K might not work.

Either way the interfaceing is trivial but more info would be required to provide more accurate feedback.

If you need more then provide a schematic of it all and also the model type of input device your intending to connect this to

Thanks

Peter

You could connect a Phoenix Contact 2900353 to the E11 signal, but that signal needs a 390 ohm resistor between it and 5V.

The polarity can be reversed simply by connecting the module slightly differently.

Thanks for the advice.

So the INPUT may require a pull-up resistor. I included the schematic of the INPUT in the question and it doesn't shown and resistor in the circuit.

The input is a WAGO 750-671 Stepper Driver Module, which requires the limit sensing input for homing sequences. I can't find any reference to input impedance or whether a resistor is needed.

I assume it is needed as its omitted from the schematic.

What would happen if I just connected the output signal to both +24V and the input?

So a DIN rail mount resistor will be required. They don't appear to exist as a standard item in the catalogue.

Maybe a device I can slot a resistor into is available...??

Douglas thanks also, I'll have a closer look at that part, and I still need a resistor as you say.

Cheers all.

2 diodes, 24V and no resistor will release the magic smoke for sure. the resistor is to limit the current through the opto LED as much as it is also a pull up

if the input to your monitor (PLC) is also an opto isolator input then you dont need to drive it with 24V

If it is already 24V capabable then it probably has a resistor or other current limit in it already so the open collector from the stepper should be able to be directly connected

Good to know that if the opto input is +24V ready, its ready to take the 24V without any resistors.

All I need to do then is put a relay in between the input and output to invert the signal, i.e. normally closed.

Thanks

why invert the signal with a relay, do it in software, much easier

Peter

I agree, but the lead time and effort to make a change to the software is enormous for the highly regulated environment it operates within.

Too much change control???

Depends who you ask. To a Quality Engineer, no, never too much change control!