Counter Function; Overview Of Counter Function - Panasonic FP7 User Manual

Counter Function

7.1 Counter Function

7.1.1 Overview of Counter Function

• The count function is used to count the number of input pulses and reflect it to the elapsed
value. The freqeuncies of input pulses can also be measured.
• When an external output is necessary, use this function in combination with the comparison
function.
• There is also a function which holds the elapsed value at the time of the trigger input signal
from an external device. For details, refer to "7.4 Elapsed Value Hold Function".
 Outline of specifications
Item
Counter type
Number of
channels
Counting range
Maximum counting
speed
(Note 1) (Note 2)
Count method
Optional functions
(Note 1): By default, the input time constant is set to 2 µs. Change the setting according to frequencies required. (The
upper limit of count at 2 µs is approx. 100 kHz.)
(Note 2): In the case of 50% duty input pulse.
7-2
Specifications
Linear counter/Ring counter
Max. 4 channels
-2,147,483,648 to +2,147,483,647
When input voltage is 5V: 500 kHz (For phase input: 500 kHz)
When input voltage is 12 V: 500 kHz (For phase input: 350 kHz)
When input voltage is 24V: 250 kHz (For phase input: 180kHz) (Note 1)
Direction distinction input, Individual input, Phase input (1 multiple, 2 multiple, 4 multiple)
Comparison output setting: Max. 8 points
Elapsed value offset / Preset function
Elapsed value hold function
Counter upper and lower limits setting
Overflow/underflow detection (only when setting the linear counter)
Input pulse frequency measurement
UM144-UM153
UM110-UM117
UM170-UM177
CHx IN-A
CMPx
EQx