The following tables lists the default input terminals for various counter measurements. You can use a different PFI line for any of the input terminals. To change the PFI input for a measurement, use the NI-DAQmx channel attributes/properties.

For information about counters on CompactRIO Single-Board controllers, refer to the Counter input and Output section in CompactRIO Single-Board Controller Physical Channels.

NI 9401, NI 9421, NI 9422, NI 9423, NI 9436, NI 9437 (8-Channel), and TS-15050 DIO P0

Measurement Ctr0 Ctr1 Ctr2 Ctr3
Count Edges
  • Edges: PFI 0
  • Count Direction: PFI 2
  • Edges: PFI 4
  • Count Direction: PFI 6
  • Edges: PFI 3
  • Count Direction: PFI 0
  • Edges: PFI 7
  • Count Direction: PFI 4
Pulse Width Measurement PFI 1 PFI 5 PFI 2 PFI 6
Period/Frequency Measurement (Low Frequency with One Counter) PFI 1 PFI 5 PFI 2 PFI 6
Period/Frequency Measurement (High Frequency with Two Counters) PFI 0 PFI 4 PFI 3 PFI 7
Period/Frequency Measurement (Large Range with Two Counters) PFI 0 PFI 4 PFI 3 PFI 7
Semiperiod Measurement PFI 1 PFI 5 PFI 2 PFI 6
Two-Edge Separation Measurement
  • Start: PFI 2
  • Stop: PFI 1
  • Start: PFI 6
  • Stop: PFI 5
  • Start: PFI 0
  • Stop: PFI 2
  • Start: PFI 4
  • Stop: PFI 6
Position Measurement
  • A: PFI 0
  • B: PFI 2
  • Z: PFI 1
  • A: PFI 4
  • B: PFI 6
  • Z: PFI 5
  • A: PFI 3
  • B: PFI 0
  • Z: PFI 2
  • A: PFI 7
  • B: PFI 4
  • Z: PFI 6

NI 9402 and NI 9435 (4-Channel)

Measurement Ctr0 Ctr1 Ctr2 Ctr3
Count Edges
  • Edges: PFI 0
  • Count Direction: PFI 2
  • Edges: PFI 3
  • Count Direction: PFI 1
  • Edges: PFI 1
  • Count Direction: PFI 0
  • Edges: PFI 2
  • Count Direction: PFI 3
Pulse Width Measurement PFI 1 PFI 2 PFI 3 PFI 0
Period/Frequency Measurement (Low Frequency with One Counter) PFI 1 PFI 2 PFI 3 PFI 0
Period/Frequency Measurement (High Frequency with Two Counters) PFI 0 PFI 3 PFI 1 PFI 2
Period/Frequency Measurement (Large Range with Two Counters) PFI 0 PFI 3 PFI 1 PFI 2
Semiperiod Measurement PFI 1 PFI 2 PFI 3 PFI 0
Two-Edge Separation Measurement
  • Start: PFI 2
  • Stop: PFI 1
  • Start: PFI 1
  • Stop: PFI 2
  • Start: PFI 0
  • Stop: PFI 3
  • Start: PFI 3
  • Stop: PFI 0
Position Measurement
  • A: PFI 0
  • B: PFI 2
  • Z: PFI 1
  • A: PFI 3
  • B: PFI 1
  • Z: PFI 2
  • A: PFI 1
  • B: PFI 0
  • Z: PFI 3
  • A: PFI 2
  • B: PFI 3
  • Z: PFI 0

NI 9411 (6-Channel)

Measurement Ctr0 Ctr1 Ctr2 Ctr3
Count Edges
  • Edges: PFI 0
  • Count Direction: PFI 2
  • Edges: PFI 3
  • Count Direction: PFI 5
  • Edges: PFI 2
  • Count Direction: PFI 1
  • Edges: PFI 5
  • Count Direction: PFI 4
Pulse Width Measurement PFI 1 PFI 4 PFI 0 PFI 3
Period/Frequency Measurement (Low Frequency with One Counter) PFI 1 PFI 4 PFI 0 PFI 3
Period/Frequency Measurement (High Frequency with Two Counters) PFI 0 PFI 3 PFI 2 PFI 5
Period/Frequency Measurement (Large Range with Two Counters) PFI 0 PFI 3 PFI 2 PFI 5
Semiperiod Measurement PFI 1 PFI 4 PFI 0 PFI 3
Two-Edge Separation Measurement
  • Start: PFI 2
  • Stop: PFI 1
  • Start: PFI 5
  • Stop: PFI 4
  • Start: PFI 1
  • Stop: PFI 0
  • Start: PFI 4
  • Stop: PFI 3
Position Measurement
  • A: PFI 0
  • B: PFI 2
  • Z: PFI 1
  • A: PFI 3
  • B: PFI 5
  • Z: PFI 4
  • A: PFI 2
  • B: PFI 1
  • Z: PFI 0
  • A: PFI 5
  • B: PFI 4
  • Z: PFI 3

The following tables list the output terminals for counter output. You can use a different PFI line for any of the output terminals.

NI 9401, NI 9472, NI 9474, NI 9475, NI 9485 (8-Channel), and TS-15050 DIO P0

Ctr0 Ctr1 Ctr2 Ctr3 FreqOut
PFI 3 PFI 7 PFI 1 PFI 5 PFI 2

NI 9481, NI 9482, and NI 9402 (4-Channel)

Ctr0 Ctr1 Ctr2 Ctr3 FreqOut
PFI 0 PFI 3 PFI 1 PFI 2 PFI 1

NI 9361 (8-Counters)

Measurement Ctr0 Ctr1 Ctr2 Ctr3 Ctr4 Ctr5 Ctr6 Ctr7
Count Edges
  • Edges: PFI 0
  • Count Direction: PFI 7
  • Reset: PFI4
  • Edges: PFI 1
  • Count Direction: PFI 6
  • Reset: PFI5
  • Edges: PFI 2
  • Count Direction: PFI 5
  • Reset: PFI6
  • Edges: PFI 3
  • Count Direction: PFI 4
  • Reset: PFI7
  • Edges: PFI 4
  • Count Direction: PFI 3
  • Reset: PFI0
  • Edges: PFI 5
  • Count Direction: PFI 2
  • Reset: PFI1
  • Edges: PFI 6
  • Count Direction: PFI 1
  • Reset: PFI2
  • Edges: PFI 7
  • Count Direction: PFI 0
  • Reset: PFI3
Duty Cycle Measurement PFI 0 PFI 1 PFI 2 PFI 3 PFI 4 PFI 5 PFI 6 PFI 7
Pulse Width Measurement PFI 0 PFI 1 PFI 2 PFI 3 PFI 4 PFI 5 PFI 6 PFI 7
Period/Frequency Measurement (Dynamic Averaging) PFI 0 PFI 1 PFI 2 PFI 3 PFI 4 PFI 5 PFI 6 PFI 7
Position Measurement
  • A: PFI 0
  • B: PFI 4
  • Z: PFI 7
  • A: PFI 1
  • B: PFI 5
  • Z: PFI 6
  • A: PFI 2
  • B: PFI 6
  • Z: PFI 5
  • A: PFI 3
  • B: PFI 7
  • Z: PFI 4
  • A: PFI 4
  • B: PFI 0
  • Z: PFI 3
  • A: PFI 5
  • B: PFI 1
  • Z: PFI 2
  • A: PFI 6
  • B: PFI 2
  • Z: PFI 1
  • A: PFI 7
  • B: PFI 3
  • Z: PFI 0
Velocity
  • A: PFI 0
  • B: PFI 4
  • A: PFI 1
  • B: PFI 5
  • A: PFI 2
  • B: PFI 6
  • A: PFI 3
  • B: PFI 7
  • A: PFI 4
  • B: PFI 0
  • A: PFI 5
  • B: PFI 1
  • A: PFI 6
  • B: PFI 2
  • A: PFI 7
  • B: PFI 3