TIO Physical Channels

Counter Input and Output

TIO devices have up to eight counter/timers referred to by the physical channel names Dev1/ctr0 to Dev1/ctr7. Unlike the other I/O types, these physical channel names do not refer to terminals on the I/O connector but instead to circuits within the device.

There are four primary terminals associated with each TIO counter. These are the terminals used as the SOURCE, GATE, AUX, and OUT functions. NI-DAQmx has default values for these terminals. For counter input tasks, if you know whether your signals provide the SOURCE, GATE, or AUX functions and wire your signal to the default input, you do not have to set the Input Terminal attribute/property.

Counter SOURCE Default GATE Default AUX Default OUT Default
Dev1/ctr0 PFI 39 PFI 38 PFI 37 PFI 36
Dev1/ctr1 PFI 35 PFI 34 PFI 33 PFI 32
Dev1/ctr2 PFI 31 PFI 30 PFI 29 PFI 28
Dev1/ctr3 PFI 27 PFI 26 PFI 25 PFI 24
Dev1/ctr4 PFI 23 PFI 22 PFI 21 PFI 20
Dev1/ctr5 PFI 19 PFI 18 PFI 17 PFI 16
Dev1/ctr6 PFI 15 PFI 14 PFI 13 PFI 12
Dev1/ctr7 PFI 11 PFI 10 PFI 9 PFI 8
Note The NI 6601 has only four counters (ctr0–ctr3). The entries in the previous table for cntr4, cntr5, cntr6, and cntr7 do not apply for that device.

Digital Input and Output

NI 661x devices have two ports, port 0 and port 1. Port 0 has 32 lines of digital input and output named Dev1/port0/line0 through Dev1/port0/line31. Port 1 has 8 lines of digital input and output named Dev1/port1/line0 through Dev1/port1/line7. The physical channel Dev1/port0 refers to all 32 lines at once, and the physical channel Dev1/port1 refers to all 8 lines at once. Port 0 can perform hardware-timed and static digital operations, while port 1 can perform only static digital operations.

Port 0 and port 1 can be used as static PFI lines, PFI 0..39. When any of PFI lines 0..39 is used as a digital I/O signal, it uses the physical channel name shown in the following table.

PFI Signal Physical Channel Name
PFI 0 Dev1/port0/line0
PFI 1 Dev1/port0/line1
PFI 2 Dev1/port0/line2
PFI 3 Dev1/port0/line3
PFI 4 Dev1/port0/line4
PFI 5 Dev1/port0/line5
PFI 6 Dev1/port0/line6
PFI 7 Dev1/port0/line7
PFI 8 Dev1/port0/line8
PFI 9 Dev1/port0/line9
PFI 10 Dev1/port0/line10
PFI 11 Dev1/port0/line11
PFI 12 Dev1/port0/line12
PFI 13 Dev1/port0/line13
PFI 14 Dev1/port0/line14
PFI 15 Dev1/port0/line15
PFI 16 Dev1/port0/line16
PFI 17 Dev1/port0/line17
PFI 18 Dev1/port0/line18
PFI 19 Dev1/port0/line19
PFI 20 Dev1/port0/line20
PFI 21 Dev1/port0/line21
PFI 22 Dev1/port0/line22
PFI 23 Dev1/port0/line23
PFI 24 Dev1/port0/line24
PFI 25 Dev1/port0/line25
PFI 26 Dev1/port0/line26
PFI 27 Dev1/port0/line27
PFI 28 Dev1/port0/line28
PFI 29 Dev1/port0/line29
PFI 30 Dev1/port0/line30
PFI 31 Dev1/port0/line31
PFI 32 Dev1/port1/line1
PFI 33 Dev1/port1/line2
PFI 34 Dev1/port1/line3
PFI 35 Dev1/port1/line4
PFI 36 Dev1/port1/line5
PFI 37 Dev1/port1/line6
PFI 38 Dev1/port1/line7
PFI 39 Dev1/port1/line8