Link 2600 - Figure 19: 2 Part Detector Edge Input Example; Figure 20: Timing Window Example for a 2 Part Detector Edge Input

Doc #: L-2600-1023 Page 30 Rev. 02
3.3.1.7 2 Part Detector Edge
The “2 Part Detector Edge” channel logic
type is used to monitor ejection for two
parts detected by a single sensor that are
completely out of the die area as soon as
they are sensed by the channel input
sensor. The channel logic looks for two
parts to be sensed during the timing
window. These parts must not enter the
sensor at the same time. There must be a
“Separation Time” between the two parts.
Figure 19 shows an example of two small
parts being sensed by an optical parts
detector. When the 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
a part ensures that the part is totally out of
the die area.
The “2 Part Detector Edge” channel type functions much like
the “1 Part Detector Edge” type, the difference being that two
parts must be sensed. The first part must be sensed in the
timing window. The leading edge of the second part must be
sensed in the timing window. It is not required that the
second part completely passes the sensor by the end of the
window. There must be a “Separation Time” between the
parts. The first part must completely exit the sensor before
the second part enters the sensor. The timing is shown in
Figure 20.
The “Input Type” of 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.
Two small parts detected by optical part detector
Transmitter Receiver
Separation
Time
Figure 19: “2 Part Detector Edge” Input Example
0
180
90270
Two Part Edge
Second Part CAN Exit
After Timing Window
(But Does Not Have To)
First AND Second
Part MUST Enter
In Timing Window
Separation Time
Figure 20: Timing Window Example for
a “2 Part Detector Edge” Input