Нужно что-то еще между ними? (реле?) Что в этом случае лучше использовать?
Sinking outputs are not available on the 7I37COM because the outputs have a V+
common so are all "sourcing" or "PNP" type outputs.
If you are making you own machine, this output mode (sourcing) is safer as it
will not enable relays or other loads in case of the most likely type of
"short" failure which is a short to ground. Likewise sinking inputs are safest
in that a short to ground will be interpreted as an inactive input so for
example in a normal NC limit switch situation a short to ground will be
interpreted as an activated limit switch (causing a fault, as it should)
Of course this does not help if you need to be compatible with
existing equipment that needs sinking outputs or sourcing inputs