there is no manual available, and the device doesn’t works as expected.
I put a voltage divider and a Z-diode to the digital io for protection.
I have 4.1v at the input, but the node switch in node red is still off /0.
The switch is set off, so the I/O should be an input.
Please put the input and output circuit schematic to your PDF.
Please design outputs short circuit proof and inputs with optocouples like every PLC is doing this.