Have you thought about using Modbus-sensors? In that case you would not need 30 analog inputs... Oppermann (german company) offers sensors like that.

Hello there, I am working with a revpi compact which has a 0-10 V temperature sensor attached to AIn_1. The temperature value is read via Node-Red and is then sent to an MQTT-Broker. It all works fine for about 2 days when suddenly the temperature value (0-10V) can not be read anymore by the revpi a...