Just checking…
As I understand, the power supply -ve/GND terminal is linked to the negative/GND side of all the inputs.
So if I have (say) a 5V input signal, I have three choices all of which are electrically equivalent:
bring the -ve signal to the corresponding GND terminal for that input
connect the input -ve to the power supply -ve rail elsewhere
connect the input -ve to any other input -ve (ie input -ves in common)
Is this correct?
Also, do Analog outputs share a common -ve?
So the same three choices are available and electrically equivalent.
I understand the Digital Outputs are clean contacts with limited voltage/current rating. The DO’s are internally isolated from the -ve/GND power rail.
Yes, that’s correct. All ground (GND) points on our device are tied to a single, common ground plane on the PCB. This includes the input terminals, the power supply ground, and the negative terminals of the analog outputs. This unified grounding scheme simplifies wiring by allowing all connected field devices and power sources to share a common reference.
We advise connecting the common ground (GND) to Earth, especially in systems with multiple power supplies. This shunts any potential voltage differences between the supplies to Earth, ensuring a stable and safe ground reference.
Final Note: The relay outputs are isolated dry contacts. In a typical setup, you will supply either 24VAC or a GND signal to one side of the relay terminal, depending on the requirements of the device you are controlling