LINK Systems OmniLink II Press Automation Control - Manual (Page 125)

August 30, 2002 Manual Version 1.0 6.20
angle just before the part is released into the next
stage of the die. The timing for Transfer is
shown in Figure 6.20. The sensor must signal
that the part is present for the entire timing
window. In addition, the sensor must signal that
the part is not present sometime during the press
stroke. If the sensor does signal that a part is
present for an entire press stroke, a sensor failure
is assumed and a stop signal will be issued.
An additional feature of Transfer type inputs is
the delay timer, which is programmed by the
operator. A programmed time of zero forces
ordinary operation of the transfer input as
described above, i.e., if the sensor does not
report the part present through the entire timing
window, a fault will occur immediately. However, if a value other than zero is programmed the channel
input is allowed to signal a missing part for the length of time programmed without a fault occurring. If
the input does not signal a part present before the time expires and the timing window is still in effect, a
fault is generated. This allows the operator to avoid nuisance faults from sensors that 'bounce' open or
closed momentarily. The delay time can range from 0 to 65535 milliseconds (65.535 seconds) in 1
millisecond increments.
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 on the sensor, and will be On when the part
is on the sensor. When a Normally On sensor is being used to sense part out; the sensor will be On when
the part is not on the sensor, and will be Off when the part is on the sensor.
Section 6.5.9 Custom
Custom type channels allow the user to define the channel logic. If there is a monitoring situation that
does not fit the logic of the eight standard types, the custom type can be used. This type allows the user
to define a set of logic rules for the channel. The channel’s input will be monitored based upon the
defined rules.
The Custom Rules are:
Detections in the timing window
Enter the timing window On
Enter the timing window Off
Exit the timing window On
Exit the timing window Off
Always On in the timing window
Always Off in the timing window
Off somewhere in the stroke
Off somewhere in the window
270
0
180
90
Part
Part Must Be
Present Through
The Entire Timing
Window
Transfer
Timing Window
Figure 6.19 Transfer Timing