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 NIDAQmx channel attributes/properties.
NI 9401, NI 9421, NI 9422, NI 9423, NI 9436, and NI 9437 (8Channel)
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 
TwoEdge Separation Measurement 




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 (4Channel)
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 
TwoEdge Separation Measurement 




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 (6Channel)
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 
TwoEdge Separation Measurement 




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, and NI 9485 (8Channel)
Ctr0 
Ctr1 
Ctr2 
Ctr3 
FreqOut 
PFI 3 
PFI 7 
PFI 1 
PFI 5 
PFI 2 
NI 9481, NI 9482, and NI 9402 (4Channel)
Ctr0 
Ctr1 
Ctr2 
Ctr3 
FreqOut 
PFI 0 
PFI 3 
PFI 1 
PFI 2 
PFI 1 
NI 9361 (8Counters)
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 







