LINK Systems System 2500 PLS - Manual (Page 55)

System 2500 Operating & Installation Manual - Revision 07 2-47
Figure 18
Two part timing
the die protection input erroneously.
If a Die Protection input is programmed as a Part Detector, the user presettable counters of the
System 2500 (Part Counter, Batch Counter, and Quality Check Counter) will then be tied to that
input. In other words, when any one of those counters is turned on (active), the counter will
increment each time a part is seen by the Part Detector input. See Section 2.6 for additional
information on the Counter functions.
Examples of probes used with Part Detector inputs are shown in Figure 17, and an illustration of
the Link 3040 Infrared Parts Detector is shown in Figure 19.
2.9.7 2 PART
The Two Part mode is used to monitor parts ejection for dies producing two parts per stroke.
The ejection of parts must be sequenced so that they do not overlap when ejected, or the sensor
used to detect the part will see only one part,
causing nuisance production stops. Some parts
with holes or irregular shapes can look like two
parts to probes and infrared sensors, giving false
signals.
When programming an input for Two Part
mode, the operator will be prompted for a
separation time. The separation interval helps
in avoiding false signals. This time can be from
4 to 999 milliseconds in 1 ms increments. The
operator will also be prompted for a timing
channel. This is the internal timing channel of
the System 2500 that will act as a 'window' for
the ejection of both parts (see Section 2.8.3 for
more information on timing channels). The timing channel should be set to turn on before the
ejection of the first part and off after the ejection of the second part (see Figure 18). Examples of
probes used with Part Detector inputs are shown in Figure 17, and an illustration of the Link
3040 Infrared Parts Detector is shown in Figure 19.
When programming an input as a Two Part Detector type, the operator must choose whether it
will be required for the second part to completely pass the detector during the timing window. If
it is desired that the second part completely pass (i.e., the detector will become inactive again
before the timing window turns off), then the input should be programmed as 'Part Pass:YES'. If
it is only required that the second part enter the detector during the window but does not have to
completely pass through until after the window, then the input should be programmed as 'Part
Pass:NO'. This signifies that only the leading edge of the second part must be seen during the