Yes you can run it using a supply derived from 24V. In my opinion it is
better that way as it keeps the computer isolated from the potentially
noisy system ground.
Les
On 09/09/2019 04:30, John Dammeyer wrote:
Quick question. Running signals from the parallel port to the BoB definitely
couples the PC Ground into the Bob. Generally then the BoB optically isolates
the PC signals from the rest of the system Or expects the motor driver to do
it. And for the rest the BoB is supplied with an isolated supply that is not
connected to the PC side.
Since Ethernet runs the 7i92H and it comes from the PC does the 5V power into
the 7i92H have to have the 5V DC Ground common with the PC DC ground? Or can
the 5V be derived from a 24V power supply whose ground is not common with the
PC ground because there's no direct connection. I recall something about PCs
using transformers inside the RJ-45 Ethernet connector but I don't remember for
sure.
John
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