ompatibility of ACS712 with KC868‑A6 ADC Inputs (Arduino)

[syme]

1. KC868-A6 4 channel analog input signal use by dc 0-5v.
2. not need.
3. not need.
4. if you want use 4-20mA current sensor, you need replace resistance on A6 pcb.

Thank you for your reply. 

I chose another sensor that only detects the current flow and activates a dry contact (M3050 module). This allows me to work with a digital input (DI). The DIs are read via the I2C interface using the PCF8574P chip. The wiring diagram of the PCF8574P shows that no GPIO is connected to it. 

Therefore, it is impossible to use interrupt-based programming to react to a DI state change. Is that correct?