Hello Douglas good question,
The Y32 output is a solid state output configured “open collector.” It will require that connect all your 0Volt power supplies together in order for it to work correctly. It has a 24volt 20ma capacity. The instruction sheet shows it driving a PLC input which is exactly the type of thing it is designed for. Doesn’t have to be a PLC input but rather a reasonably high impedance input is best.
That is where the part about connecting all the external power supplies 0volt terminals together comes in. This way all the components in the same panel have a common reference point and then you only need 1 output terminal from the PNOZ to the device it is going to connect too, ok?