LINK Systems OmniLink II Press Automation Control - Manual (Page 145)

August 30, 2002 Manual Version 1.0 7.8
In addition to being the desired setting for an unused channel, Always Off mode has another potential
use. Some operations, such as gag tooling, may require solenoids to be on or off depending upon the
part being produced. These operations may require that certain outputs be On or Off during the entire
production run. In such operations, the Always Off mode can be used when the output is Off for the
entire production run.
Section 7.5.2 Always On Mode
When programmed for Always On mode, the PLS channel output is always turned on. This mode
should be used when a channel output is required to remain on during the entire production run.
The Always Off mode has a potential use in some gag tooling operations, may require solenoids to be on
or off depending upon the part being produced. These operations may require that certain outputs be On
or Off during the entire production run. In such operations, the Always On mode can be used when the
output is On for the entire production run.
Section 7.5.3 Normal Mode
When programmed for Normal mode, the PLS channel output will turn on at an angle and turn off at an
angle. This is the basic operation of a programmable limit switch. At the on angle the output will turn
on. The output will turn on until the off angle is reached.
One application of Normal mode is an ejector control. The channel can be programmed to turn on the
ejector solenoid and an angle and then turn off the ejector solenoid at another angle.
A Normal mode channel can have counted outputs and can have speed advanced on and/or off angles. If
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. 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 7.5.4 Timed Off Mode
When programmed for Timed Off mode, the PLS channel output will turn on at an angle and turn off
after a programmed time. The turn off of the channel output is not based upon press position, but
instead is a programmed time after the turn on angle.
One application of Timed Off mode is a material lubrication control. The channel can be programmed
to turn on the material lube at an angle and then turn off the lube after a fixed time. The advantage of
the Timed Off mode in this example is that a fixed amount of lubrications will be put on the material.
The amount of lubrication will not decrease or increase as the press slows down or speeds up. In
addition, if a lubricator is controlled by a Normal mode channel that has on and off angles, and if the
press stop between the on and off angles, the lubricator would remain off until the press re-starts and
passes the off angle.
A Timed Off mode channel can have counted outputs and can have a speed advanced on angle. If