KEYENCE EX-V Series User Manual

Page 69

Chapter 4 Use of Data Processing Functions

■ Internal trigger mode (Example of internal trigger UP )

•

The sampling operation starts when the sampling delay time elapses after the
measured value exceeds the trigger level. When the sampling period elapses,
the internal timing signal is turned ON and the "difference between the
maximum and minimum values" is displayed/output.

•

For the internal trigger down operation, the trigger point is the instant when
the measured value falls below the trigger level.

•

The instant when the sampling starts, the strobe output turns ON.

•

Turning the strobe output from ON to OFF results in the off-delay of 2 ms for
updating the comparator output.

Reference: To clear the measured value being held and to start the measurement
again, short-circuit the hold-reset and GND terminals.

Cyclical difference measurement function [b-1]

Automatically measures the difference between the maximum and minimum values
detected in each sensor input cycle.

•

When the measured value exceeds the minimum value by the amount of a
specified trigger hysteresis, the sampling starts. When a cycle completes and
the measured value again exceeds the minimum value by the amount of a
specified trigger hysteresis, the difference in one cycle is determined.

•

When the power is turned ON or the hold-reset signal is input, the display
shows "----" until the measured value exceeds the minimum value by the
amount of a specified trigger hysteresis.

(t)

OFF

(p-b)

(p'-b')

When the power is turned ON or the hold-reset
signal is input, the display shows " " until
the first measured value is determined.

Displayed value

Internal data reset

Internal timing

Strobe output

Trigger point

Simple difference
value

Sampling
delay

Sampling period

Trigger level

(t)

OFF

(p-b)

Sampling period Sampling period Sampling period Sampling period

Displayed value

Internal timing

Trigger point

Cyclical difference values

Trigger hysteresis