LINK Systems OmniLink II Press Automation Control - Manual (Page 133)

August 30, 2002 Manual Version 1.0 6.28
remains in the fault condition for the length of the delay time, a fault will be issued. If the channel
returns to a run condition before the full length of the delay time, a fault will not be issued. The
maximum value of this delay time is 65535 milliseconds (65.535 seconds). If a delay time is not
required, this parameter should be set to 0.
Section 6.7.1.7 Delay Strokes
This parameter is used by Cyclic and Customer channel logic types only. This is the number of strokes
that can be made without satisfying the channel logic before a stop is asserted. This purpose of this
delay is to accommodate events that may not occur every stroke, but will occur within some number of
strokes. An example of such an application is slug detection, where under normal conditions slugs will
build up and then fall out maybe two or three at a time. The delay counter allows the operator to enter a
number representing the maximum number of strokes that can be run consecutively without the slug
being detected within the timing window. If the sensor does not become active within the window for a
number of strokes exceeding the counter number, then a fault will be generated. By contrast, if the
sensor does become active within the window on some stroke before the counter expires, then the
counter is reset and the full count is again allowed. If the operator desires that the sensor be required to
become active on every stroke, then a value of zero should be entered into the counter. (Note that
although the sensor is allowed to remain inactive throughout a stroke when the stroke counter is used,
the opposite is not true; e.g., the sensor is not allowed to remain active through an entire stroke or a fault
is generated.) The maximum Delay Strokes value is 255.
Section 6.7.1.8 Window On and Window Off
These are the angular settings in degrees for the timing window. These parameters are required for all
channel types except Static. The permissible values are from 0º to 360º.
Once the timing window values are entered, they will be graphically displaced on the circular display in
the lower right corner of the screen. The timing window duration will be highlighted in blue.
Section 6.7.1.9 Separation Time
This parameter is required for Two Part Detector Edge, Two Part Detector Pass, and Custom channel
types. When an single sensor input is used to sense multiple parts, the operator must also program a
Separation Time. This is due to the fact that some parts are irregularly shaped or have holes which may
cause the detector to give multiple signals to the channel input for one part. To ensure that the detector
counts only once for the first part, the module will wait through a programmed delay after seeing the
first part before it begins to look for the next part. This programmed delay must be entered by the
operator and is called Separation Time. The range of allowed values for the separation time is 0
milliseconds to 999 milliseconds in 1millisecond increments. The proper value for a particular
application will have to be determined by experimentation.
Section 6.7.2 Channel Diagnostics
The Die Protection screen shown in Figure 6.22 has a circular display in the lower right corner. This
display gives a graphical representation of the timing window and the input sensor. Additional
diagnostic information is available on the Die Protection Channel Diagnostics screen. Selecting the
CHANNEL DIAGS softkey on the Die Protection screen will display the Die Protection Channel