Title says it all: can an opto-isolated input be analog or are they intrinsically digital?
Why: I am looking to purchase a relay control board and am deciding between a few options.
Here is my primary option, however I need 5 analog inputs and this one states that it has opto-isolated inputs. Could those be analog?
EDIT: Page 6 of the user manual has each opto-isolated line connected to a digital and an analog input pin. Does this mean it can accept analog (voltage) inputs?