Banner MULTI-BEAM Series - Manual (Page 22)

LM5 on-delay
LM5R off-delay
LM4-2NR one-shot (non-retriggerable)
LM5-14 on- & off-delay
LM5T limit timer
LM6-1 rate sensor
Setable time range: .1 to 1 second.
Setable time range: 1.5 to 15 seconds.
Setable time range: 1.5 to 15 seconds.
Setable time range: 1.5 to 15 seconds.
Setable time range: 1.5 to 15 seconds.
Setable rate: 60 to 1200 pulses per minute.
The LM5 is a true "on-delay" type logic module. The input signal must be present for a
predetermined length of time before the output is energized. The output then remains energized
until the input signal is removed. If the input signal is not present for the predetermined time
period, no output occurs. If the input signal is removed momentarily and then reestablished, the
timing function starts over again from the beginning. A LIGHT/DARK operation selection
jumper is included. The standard time range is adjustable from 1.5 to 15 seconds (field
adjustable), and other ranges are available. The LM5 is often used to detect jams on a conveyor
line, where a beam broken for longer than a preset period of time implies a product jammed in
the light beam.
The LM5-14 combines the function of an "on-delay" and an "off-delay" into one logic module.
When the signal is present for more than the on-delay time, the output energizes. The off-delay
circuit is now active, and holds the output on even if the input signal disappears for short periods
of time. If the input signal is gone for longer than the off-delay time, the output finally drops out.
The most common use for the LM5-14 is to control fill level, for example in a bin: when the bin
is full, a beam is broken, and a predetermined time later, the flow is stopped. After the level has
fallen below the beam for a time, the flow is restarted. The time delays control the high and low
levels. Each delay is independently adjustable for 1.5 to 15 seconds.
The LM5T "limit" timer combines the function of on-off logic and on-delay logic. As long as
the signal is present for only short periods of time, the output "follows the action" of the input
signal. If the input signal is present for longer than the predetermined time, the output
deenergizes. The output only reenergizes when the input signal is removed and then reestab-
lished. Interval timers are used to operate loads which must not run continuously for long periods
of time, such as intermittent duty solenoids and conveyor motors. The LM5T may be used to run
a supermarket checkout conveyor, always bringing the product up to the sensor beam and then
stopping the motor. When the last item is removed, the motor times out and stops. Timing range
is .15 to 15 seconds.
The LM6-1 is a true overspeed or underspeed sensing logic module that monitors signals from
a scanner block and continuously calculates the time between input signals, and compares that
time with the reference set by the "HOLD" potentiometer. A jumper allows the mode to be
changed from overspeed (jumper installed) to underspeed (jumper removed). In the overspeed
mode, the output will drop if the preset rate is exceeded. In the underspeed mode, the output
remains energized until the input rate drops below the preset. The output will not "pulse" at low
speeds as retriggerable one-shots do. A "DELAY" adjustment allows the LM6-1 to ignore data
for the first several seconds after power is applied, to permit the rate to accelerate to operating
speed without false underspeed outputs. The sensing rate may be adjusted from 60 to 1200 pulses
per minute (.05 to 1.0 second per pulse), and the power-up inhibit from 1 to 15 seconds.
The LM5R is an "off-delay" logic module, similar to the LM5, except that timing begins on the
trailing edge of the input signal. When the input occurs, the output is immediately energized; if
the input is then removed, the output remains energized for the adjustable pre-determined time
period, then de-energizes. If the input is removed but then re-established while the timing holds
the output energized, a new output cycle is begun. The LM5R might typically be used to tell when
no products have broken a beam for a predetermined length of time, therefore indicating a jam
or an empty reservoir upstream. The LIGHT/ DARK operate jumper wire is included. Timing
range is adjustable from 1.5 to 15 seconds, and optional ranges are available.
The LM4-2NR provides a one-shot ("single shot") output pulse each time there is a transition
from LIGHT to DARK (jumper installed) or from DARK to LIGHT (jumper removed). The
output pulse time range is adjustable from 0.1 to 1 second. The duration of the pulse is
independent of the duration of the input signal. The output pulse of the LM4-2NR must complete
before it recognizes another input transition. This is called a "non-retriggerable" one shot, which
sometimes offers an advantage in indexing or registration control applications where multiple
input signals are possible during advance of the product.
MULTI-BEAM
3- & 4-wire Logic Modules
OUTPUT
SIGNAL
OUTPUT
SIGNAL
Hold Hold
OUTPUT
SIGNAL
Pulse Pulse Pulse
OUTPUT
SIGNAL
Delay
OUTPUT
SIGNAL
Delay Hold
Hold
OUTPUT
SIGNAL
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Model and Function Description of Logic