LINK Systems OmniLink II Press Automation Control - Manual (Page 121)

August 30, 2002 Manual Version 1.0 6.16
Section 6.5.4 One Part Detection Edge
The One Part Detector Edge channel logic type
is used to monitor ejection for parts that are
completely out of the die area as soon as they
are sensed by the channel input sensor. The
channel logic looks for one part to be sensed
during the timing window. An example of One
Part Detector is shown in Figure 6.11. This
example shows a small part being sensed by an
optical parts detector. When this small part
first interrupts the sensing field of the optical
parts detector it is completely out of the die
area. Detection of the leading edge of this part
insures that the part is totally out of the die
area.
The One Part Detector Edge input type
functions much like the Cyclic type, the
difference being that the timing window must
turn on before, not while, the part is being
ejected (activating the sensor). In other words,
the Part Detector type requires that the sensor
NOT be active when the window turns ON,
and then become active at some point during
the window. The sensor can still be active at
the end of the window. With One Part
Detector Edge, it is not required that the part
completely passes the sensor by the end of the
window. The timing for a One Part Detector
Edge is shown in Figure 6.12.
The sensor being used to verify part detection
can be Normally Off or Normally On. The
sensor will switch from its normal state when
the part is being detected. When a Normally Off sensor is being used to sense part out; the sensor will
be Off when the part is not in the sensor, and will be On when the part is in the sensor. When a
Normally On sensor is being used to sense part out; the sensor will be On when the part is not in the
sensor, and will be Off when the part is in the sensor.
Section 6.5.5 One Part Detection Pass
The One Part Detector Pass channel logic type is used to monitor ejection for parts that are not
completely out of the die area when they are first detected by the channel input sensor. The channel
logic looks for one part to be sensed during the timing window, and also looks for the part to be past the
sensor at the end of the timing window. By the end of the timing window, the part should be completely
TRANSMITTER RECEIVER
SMALL PART DETECTED BY OPTICAL PART DETECTOR
Figure 6.11 One Part Detector Edge
270
0
180
90
Part Can Exit
After Timing
Window
Part Must Enter
In Timing
Window
One Part-Edge
Figure 6.12 One Part Detector Edge Timing