Using an NPN sensor for two different PLCs

[ashtul]

This may sound like a stupid question but I feel like I should ask before giving up.

I have an older PLC which control a step conveyor. I want to add a few engines with an additional small PLC. The sensors installed are NPN which fit (I guess) the old one. The new PLC I got requires PNP input. Attached you can find a diagram for implementing NPN with a 10Kohm resistor.

Is there a way to do this with these two different PLCs? If not, just out curiosity, can I do it with two PLCs which both require NPN?

Thanks

 

[keithkyll]

If the PLC input is PNP, the resistor needs to be small enough to trigger the input. Try 2700
Ohms. That will give you about 7-8 mA.
Yes to second question. You can drive two NPN inputs in parallel.

 

[shooter]

you can mix them as the only important thing is the presence or absence of 24 Volt.

 

[bernie_carlton]

For both PLCs to see the sensor the reference for the input groups must be connected together and to the appropriate side of your 24 VDC power supply.