LMI chroma+scan 3155, Руководство пользователя

Страница: 51 / 95

51
pulses).
The resolution of the encoder is not measured automatically. If
the encoder resolution is not already known, use the
Encoder
Value server health indicator to record the number of pulses
over a measured distance, and then use these values to
calculate the resolution: (distance in mils) / (encoder pulses).
Tip: to simulate forward motion while the system is stationary
(sometimes useful for testing purposes), enter an encoder
resolution and a simulated speed
separated by the “@”
character. For example, the input
“4.165@40000” is interpreted
as a request to simulate motion at 40000 mils/second with an
encoder resolution of 4.165 mils per pulse. The server will
override the encoder values in data messages to simulate
motion at the requested speed. Note: the encoder values in
health and event messages are not affected by simulation.
Laser Activate The laser activation parameter is the minimum amount of
conveyor chain movement to turn lasers back on, in ticks. It
represents the difference between a moving conveyor and jitter
from a stopped conveyor. This value should be selected
depending on the encoder resolution. For example, if the chain
might jitter by 0.9'' when stopped, the corresponding number of
ticks can be calculated from the encoder resolution. A laser
activation value of 0 disables the laser watchdog feature.
NOTE: This value should be increased if lasers do not remain
off while the conveyor chain is stopped.
Laser Sleep The duration of time, in milliseconds, for the conveyor chain to
be stopped before lasers are shut off. Note that the effective
sleep time may be up to twice this value. A sleep time of 0
disables the laser watchdog feature.
NOTE: If the conveyor chain is stopped while a board is being
scanned, and lasers shut off, the board should be rescanned.
Tracheid Threshold Specifies a global modifier for all the Top or
Bottom sensors’
Tracheid thresholds applied at the raw image level (applies only
to systems with Tracheid cameras).
Increasing this value raises the threshold and tends to increase
the dot independence. This helps increase the accuracy of near-
horizontal Angle measurements. Increasing this value can cause
dots to appear rounder in the Aspect Ratio output.
Decreasing this value lowers the threshold and tends to
increase the scatter signal processed, resulting in a stronger
Aspect Ratio. Lowering this value too much begins including
more noise in the dot data.