Routing Considerations for TIO Devices

Counters

Though TIO counters can receive signals from any of the PFI lines, NI-DAQmx uses internal resources to connect some PFIs to counter inputs. There are some PFI lines that do not use internal resources that are preferred for use with different counter signals.

• CtrnAux—PFI 37, PFI 33, PFI 29, PFI 25, PFI 21, PFI 17, PFI 13, PFI 9
• CtrnGate—PFI 38, PFI 34, PFI 30, PFI 26, PFI 22, PFI 18, PFI 14, PFI 10
• CtrnSource—PFI 39, PFI 35, PFI 31, PFI 27, PFI 23, PFI 19, PFI 15, PFI 11

For output, the same rules apply. Though the counter can output on any PFI line, there are a subset of preferred PFIs that do not use internal resources to make the routes.

• CtrnInternalOutput—PFI 36, PFI 32, PFI 28, PFI 24, PFI 20, PFI 16, PFI 12, PFI 8

To see if the route you are making uses internal resources, consult the table displayed under the Device Routes tab in MAX.