LINK Systems System 2500 PLS - Manual (Page 49)

System 2500 Operating & Installation Manual - Revision 07 2-41
Figure 10
A cyclic input used to monitor
shut height changes
Figure 11
Cyclic mode timing
2.9.2 CYCLIC
Cyclic inputs are derived from monitored events that occur once each machine cycle when the
production process is functioning normally. An example of a cyclic event is shut height
monitoring as shown in Figure 10.
In normal operation, when the die
closes, a switch or probe will be
closed, then, when the die opens
again, the switch will open. If
parts should stack up in the die,
the switch will not close and a
fault will be detected.
When programming an input for
cyclic mode, the operator is asked
to enter a timing channel number.
This is the internal timing channel
of the System 2500 that will act as
a 'window' for the cyclic event (see
Section 2.8.3 for more information on timing channels). The timing channel should be have its
on/off setpoints programmed so that it is on during the portion of the stroke that the cyclic event
should happen (see Figure 11).
Cyclic inputs can be programmed to issue either an Emergency Stop (ES) or Top Stop (TS) when
a fault occurs. In addition, the Cyclic mode has a special fault output option available where the
operator may choose to have a PLS output become active for one stroke to control some desired
action in response to the fault. When programming Cyclic mode, the operator will be asked to
choose ES, TS, or ASSIGN as the desired stop output. Choosing ASSIGN will allow the
assignment of one of the first eight PLS channels as fault output. The system will request that