FPΣ User's Manual 
 
7.3 High-Speed Counter Function 
109 
7.3.2 Minimum Input Pulse Width 
For the period T (1/frequency), a minimum input pulse width of T/2 (single-phase input) or T/4 
(two-phase input) is required. 
T
T
2
T
2
 
T
4
T
T
4
T
4
T
4
 
Single-phase input  Two-phase input 
 
7.3.3 I/O Allocation 
The inputs and outputs used will differ depending on the channel number being used. (See 
"
Function Specifications and Restrictions" on page 102.) 
The output to be turned to TRUE or to FALSE can be specified with the instructions 
F166_HighSpeedCounter_Set and F167_HighSpeedCounter_Reset. Outputs can be 
specified from Y0 to Y7. 
Using channel 0 with incremental input and reset input  
1
 
Count input X0 
2
 
Reset input X2 
3
 
TRUE/FALSE output 
Yn 
The output which is turned TRUE or FALSE when the target value is 
reached: Y0–Y7 
FPΣ: 
 
   
Using channel 0 with two-phase input and reset input 
1
 
Phase A input X0 
2
 
Phase B input X1 
3
 
Reset input X2 
4
 
TRUE/FALSE output 
Yn 
The output which is turned TRUE or FALSE when the target value is 
reached: Y0–Y7 
FPΣ: