KEYENCE EX-V Series User Manual
Page 60
Chapter 4 Use of Data Processing Functions
4
50
Simple bottom-dead-center measurement function (Internal trigger) [b-0]
Measures the "minimum value" detected during a specified period.
*
The external trigger mode is not available for the simple bottom-dead-center measurement. For the
internal trigger setting, only a trigger level and trigger hysteresis can be specified.
•
If a comparator output disable input turns ON before the comparator operation,
the comparator output does not turn ON.
•
The trigger level is factory-adjusted to the full scale.
•
Turning the strobe output from ON to OFF results in the off-delay of 2 ms for
updating the comparator output.
Limited bottom-dead-center measurement function [b-1]
Measures the "minimum value" detected during a specified period (sampling
period).
For the limited bottom-dead-center measurement function, the sampling period can
be specified with the combination of the trigger mode and delay time settings.
➮ For the details of the trigger mode and delay time, refer to pages 53 to 55.
Timing diagram
■ External trigger mode
•
If a comparator output disable input turns ON before the comparator operation,
the comparator output does not turn ON.
•
The sampling period is between the UP edge of the timing input (hold-reset
input) and the UP edge of the next timing input. The value measured at the
instant when the timing input turns ON is displayed/output.
Reference: To clear the measured value being held and to start the measurement
again, short-circuit the hold-reset and GND terminals.
(t)
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
0
When the power is turned ON or the hold-reset signal is input,
the display shows " " until the first timing signal is input.
Displayed value
POWER ON or
Reset input
Strobe output
HIGH OUT
HI
GO OUT
GO
LOW OUT
LO
Comparator
output disable input
Bottom-dead-center values
Trigger level
(t)
0
ON
OFF
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
Timing input
Limited bottom-dead-center values
Sampling period
Sampling period
Sampling period