LINK Systems OmniLink II Press Automation Control - Manual (Page 146)

August 30, 2002 Manual Version 1.0 7.9
programmed for counted outputs with a count of four, the channel will not turn on every stroke, but only
turn on every fourth stroke. See Section 7.5.6. The on angle can be independently adjusted to
compensate for device reaction time, so that the end result always occurs at the desired point. See
Section 7.5.7.
Section 7.5.5 Toggle Mode
When programmed for Toggle mode, the PLS channel will turn on at an angle, remain on for a
programmed number of strokes. After the programmed number of stroke, the PLS channel will turn off
at the angle, and remain off for the programmed number of strokes. The channel will repeat the On and
Off cycle.
An application of Toggle mode, is a parts diverter. If it is required that a part bin be filled with a fixed
number of parts, then a diverter shift to fill another bin with the same fixed number of parts, the Toggle
mode can be used. While the second bin is being filled, the first bin can be removed and replaced with
an empty bin.
The Toggle On and Off angles can be independently speed advanced. If programmed for speed advance,
the on and/or off angles can be advanced based upon machine speed. These angles can be independently
adjusted to compensate for device reaction time, so that the end result always occurs at the desired point.
See Section 7.5.7.
Section 7.5.6 Counted Outputs
Some modes can be programmed for Counted Outputs. A channel programmed for counted output will
not have its PLS function occur every stroke. Instead it will cycle its output relay after the programmed
number of strokes. For example a channel set to the Normal mode with a Counted Output set to five
strokes, will turn its output relay on and off every fifth stoke. The output relay will remain off during
the remaining four strokes of the five stroke cycle.
An application of counted outputs is a scrap chopper. When strip material is fed into the die and when
scrap or unused material exits, it is necessary to cut the scrap into small strips. A solenoid activated
scrap chopper can cut the material into strips. These strips must be small enough to be conveniently
handled, but it is unnecessary to chop the material every stroke. Chopping the material every stroke
would put excessive ware on the scrap chopper. A counted output can be used to control the scrap
chopper. The count can be set high enough so that the cut scrap can be easily handled, but the chopper
will not have to chop on every stroke.
Section 7.5.7 Speed Advanced Leading and Trailing Edges
Turn on and/or turn off angular positions can also be independently speed advanced. The speed
advance, if properly programmed, will cause the PLS outputs to turn on or turn off earlier in the stroke
to compensate for the greater distance the machine crankshaft will turn at higher speeds in the given
reaction time of the automation device. If Normal Mode is used, both the on angle and the off angle can
independently speed advanced.
Speed advance is based upon the fact that all devices have a reaction time. A device’s reaction time is
the time between the receipt of the go signal and the time that the device accomplishes its task. For