KEYENCE LS-7000 - Manual (Page 93)

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Chapter 4 Function Settings
4
● Self-timing Hold and Area Settings
The LS-7000 Series in self-timing hold operation will detect a target when the target is
within the optical axis. Then the LS-7000 Series will start sampling after a certain period
(i.e., a self-timing period) elapses. Therefore, the target may enter the measuring area
from any direction as shown below.
The LS-7000 Series will detect the target within the optical axis when the LS-7000
Series confirms a certain number of edges and not at the moment the target enters the
optical axis. The confirmation condition varies with the measurement method selected
as an area setting. Refer to the following examples.
Diameter (DIA) Measurement
The target will be detected when the number of edges in the optical axis is four or over.
Edge
1
2
Edge
1
2
4
3
Segment (SEG) Measurement
The target will be detected when the number of edges in the optical axis coincides with
the number of edges specified.
In the following example, settings are made so that the width between edges 002 and
003 will be measured.
Edge
1
2
2
3
1
4
Edge
The number of edges in the optical axis is
two. The target has not been detected yet. The number of edges in the optical axis is
four or over. The target has been de-
tected.
The specified edge value (003) has not
been detected within the optical axis. The
target has not been detected. The specified edge value has been
detected within the optical axis. The
target has been detected.
Note: The LS-7000 Series in self-timing hold mode cannot be used for the following
measurement applications, when the LS-7000 Series will be always in meas-
urement operation regardless of whether there is a target or not (because the
internal measured value always exists).
Example: • T-EDGE (Top edge) measurement
• B-EDGE (Bottom edge) measurement
• SEG (Segment) measurement of 001 and 002 edge widths