I would like to operate an Adam 4055 module to control two different applications having their own power supply.
Adam 4055 is Digital Input/Output control module over RS-485, I use only the DO part here. Reading the doc, Adam 4055 DO are Open Collectors.
I have adapted schematic from manufacturer documentation (page 81 in search bar, P.67 within the footpage, section 3.16.1, schematic is embedded bellow) which is using a single power supply:
Provided both load loops respect manufacturer prescriptions (power, voltage, drained current), is the following schematic correct and safe (nodes are labeled as they will be connected to the module):
In this setup I could not use pin DO.COM (I currently do not know if I must use this pin, doc is not explicit about that) because sources have different voltages. I just connect Ground (D.GND) pin to make both power supply having the same potential reference.
Is this setup correct and safe? Will it require improvement?