Can the digital inputs accept a 24V DC signal from a gate controller?

[gmfr17]

Hello,

I'm planning to use a KC868-A16S with ESPHome and Home Assistant, and I would like to confirm that I can connect the 24V DC status output of my motorized gate controller to one of the digital inputs.

Signal source (gate controller DEA NET24N, terminals 12-13 "WARNING"):

• Output: 24V DC, max 15 W (designed to drive a gate-status lamp)
  
• Depending on a parameter, it is either steady while the gate is open, or flashing while the gate is moving
  
• It is a power-type output meant for a lamp, not a low-current logic signal
  
• I only need to read this one signal (1 input used)
  

My questions:

1. Can the optocoupled inputs (IN1 to IN16) accept 24V DC directly? Is this within the rated limits of the optocoupler and input circuit?
   
2. What is the maximum input voltage you recommend or guarantee on these inputs?
   
3. The inputs share a common by group of 8. Should I connect the gate controller's 0V to this common? Is this common isolated from the board's 12V supply ground, or are they tied together?
   
4. Is the response time of the inputs and the PCF8574 path suitable for detecting a signal flashing at about 1 to 2 Hz?
   
5. Since the source is a lamp output that may show voltage spikes or ripple (it is not a regulated logic signal), would you recommend any protection on the input (series resistor, TVS diode)?
   

If direct connection is not recommended, I was thinking of using an external relay with a 24V DC coil (Finder 40.52) driven by the gate signal, with its dry contact switching the 12V from the board's supply to the input. Would you consider this the safer approach?

Thank you very much for your help.
Best regards,
GM from France (I used some help from an AI as English is not my native language)

[admin]

KC868-A16S only use by DC12v, so the digital input max 12v.
if you want to use DC24v for digital input, chose B16M + extend relay module is better.