Overview Of Measurement Function; Types Of Measurement Function - Panasonic FP7 User Manual

6.1 Overview of Measurement Function

6.1.1 Types of Measurement Function

 Measurement function
• The measurement function is to measure the changes in the count values of the high-speed
counter and to output them as frequencies or number of rotations.
• Measuring results are stored in unit memories (UM). They can be read by user programs if
necessary.
 Types of measurement function
Type
Time
between
Frequency pulses
measurement
function
Time
between
Rotation
pulses
speed
measurement
A function
Rotation
speed
measurement
B function
KEY POINTS
•
When the measurement function has been selected in the configuration
area, the measuring operation starts once the operation ready done flag
turns on.
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Operation image Feature
Measures the time in which the count value changes, and
calculates the frequency.
Frequency (Hz) = 1/Time between pulses (s)
When there is no change in the count value for one
second, the result is 0 Hz.
Calculates a rotation speed (rpm) from the time interval of
the change in the counter and the specified pulse number
per rotation, and stores the measuring result after
averaging in the unit memory (UM).
Any number can be set for the number of averaging.
Measures the time interval of the change in the counter,
and calculates the rotation speed (rpm).
Rotation speed (rpm) = 60/(Time between pulses x
Number of pulses per rotation)
The rotation speed measurement A function can be used
for the case such as the interval of the change in the
counter is large (low-speed pulse).
When there is no change in the count value for one
second or more, the result is 0 rpm.
Automatically calculates a rotation speed (rpm) from the
time interval of the change in the counter and the
specified pulse number per rotation, and stores the
measuring result after averaging in the unit memory.
Any number can be set for the number of averaging.
Measures the time which counts the specified pulse
number per rotation, and calculates the rotation speed
per rotation (rpm).
Rotation speed (rpm) = 60/(Time taken for one rotation)
The rotation speed measurement B function can be used
for the case such as the time interval of the change in the
counter is not even. However, when it takes for one
second or more for one rotation, the result is 0 rpm.