Mitsubishi Electric L02SCPU User's Manual And Reference page 259

(b) Operating procedure
The following is the procedure for monitoring the values.
"High-speed counter function - monitor CH selection" screen
"High-speed counter function - monitor target selection" screen
"High-speed counter function - current value monitor" screen
"High-speed counter function - frequency monitor" screen
"High-speed counter function - rotation speed monitor" screen
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CHAPTER 4 DISPLAY UNIT FUNCTIONS
1.
Select "CH1" or "CH2" using the  and  buttons
and press the button.
OK
2.
Select "PRESENT VAL MON", "PULSE
FREQUENCY", or "ROTATION SPD" using the 
and  buttons and press the
3.
The displayed items are shown.
button.
OK
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4