Banner MULTI-BEAM Series - Manual (Page 23)

Setable time range: 1.5 to 15 seconds.
Setable time range: 1.5 to 15 seconds.
Setable time range: 1.5 to 15 seconds.
LM8A on-delay one-shot
LM10
÷
10 counter
LM8-1 delayed one-shot
LM8 repeat cycler
Model and Function Description of Logic
The LM8 is a repeat cycle timing module with independently adjustable delay and hold times.
When an input signal is received from the scanner block, a delay period begins during which there
is no output. If the signal remains, the delay period is followed by a hold period, during which
the output is energized. If the signal still remains, the hold period times out, releasing the output
and starting a new delay period. This sequence continues indefinitely until the input signal is
removed. The LM8 is used in edgeguide and other registration control schemes where it is desired
to "pulse" the correction motor to avoid overcorrection that might occur with a continuous output.
Both time ranges are indpendently adjustable from 1.5 to 15 seconds. NOTE: use of the LIGHT/
DARK operate jumper is reversed: remove for DARK, leave in place for LIGHT.
The LM8-1 is a delayed one-shot that functions very much like two individual one-shots, with
the end of the first initiating the second. When an input signal occurs, a delay period is initiated,
during which time the output is not energized. After the delay, the output is energized for the hold
period, then deenergized. No further action takes place unless the signal is removed and then
reestablished. This sequence is independent of the duration of the input signal. The LM8-1 is
frequently used to sense a product, and then act on that product a short time later when it is clear
of the inspection station. An example might be to inspect cartons for open flaps, and to eject the
faulty cartons when they have completely passed the inspection point. Both time ranges are
adjustable from 1.5 to 15 seconds.
The LM8A differs slightly from the LM8-1. It too incorporates both a delay and a hold time,
except that the delay is a true on-delay. If the input signal does not last for the total duration of
the delay time, no output action ever occurs (with the LM8-1, even a momentary signal generates
one complete cycle of timing). If the delay time passes, the one-shot output occurs, regardless
of what happens to the input signal. Removing the input signal and reapplying it begins a new
cycle. The LM8A is used to eject a part that has remained in the sensor beam longer than the delay
time (for instance, a jammed part). Both time ranges are independently adjustable from 1.5 to
15 seconds. NOTE: use of the LIGHT/ DARK operate jumper is reversed: remove for DARK,
leave in place for LIGHT.
The LM10 is a fixed-count divide-by-ten logic module, with neither timing nor LIGHT/ DARK
operate functions. When power is first applied, the output is OFF; with each dark-to-light
transition, the LM10 enters one count in its memory. After five counts, the output is energized,
and it remains energized until the tenth count. It then deenergizes, and the sequence continues.
The LM10 is intended for product counting applications using programmable logic controllers
or computers, where the scan time of the input section of the controller is too slow to permit
"catching" high speed count rates. It may also be used with electromechanical totalizers, which
suffer from this same slow response. In operation, of course, the registered count must be
multiplied by ten to get the true count (ambiguity of five).
LMT is a plug-in test logic module for use when troubleshooting MULTI-BEAM sensors. It
contains LED indicator lights in place of the timing potentiometers and a miniature switch in place
of the LIGHT/DARK operate jumper. The indicator lights display the operation of the scanner
block and power block to verify proper functioning, and the switch permits manual operation of
the load to verify the output switching circuit. The step-by-step testing procedure included with
the LMT will allow a MULTI-BEAM to be completely tested without removing it from the
installation, and, if there is a faulty scanner block, power block, or logic module, the LMT will
identify it. The LMT may also be used with all 2-wire MULTI-BEAMs (see pages 24 to 29).
LMT
test
logic
• For logic modules with a single timing function, specify the maximum
desired time in seconds (e.g., LM5M5 indicates an LM5 on-delay with the delay
time adjustable up to 5 seconds).
• For logic modules with dual timing functions, specify the maximum desired
delay and hold time in seconds (e.g., LM5-14M1M5 indicates an LM5-14 on-
off delay with an on-delay adjustable up to 1 second and an off-delay adjustable
up to 5 seconds). Always specify both timing ranges, even if only one is to be
modified.
• For fixed timing, the letter "F" should always be followed by the desired time,
in seconds (e.g., LM5MF1 would be an LM5 on-delay with a fixed 1 second
delay time). For fractions of seconds, use decimal equivalents, such as
LM5MF.5, or LM5MF.01, etc.
Model Number Suffix Setable Time Range
M.01 .001 to .01 seconds
M.1 .01 to .1 seconds
M.5 .05 to .5 seconds
M1 .1 to 1 second
M5 .5 to 5 seconds
M15 1.5 to 15 seconds
Hold
OUTPUT
SIGNAL
Delay Delay Delay Hold Hold
Hold
OUTPUT
SIGNAL
Delay Delay Hold
OUTPUT
SIGNAL
Delay
Hold
OUTPUT
SIGNAL
MULTI-BEAM
3- & 4-wire Logic Modules
23
The time ranges of any MULTI-BEAM 3- & 4-wire logic module may be
factory modified. Time range modification is often necessary to improve the
setability of the timing function. Some time range modifications are carried in
stock. The current Banner products price list is the best source of this
information. Other time range modifications may be quoted. When ordering
modified logic modules, add the letter "M" after the model number, followed
by the maximum time desired (in seconds). The table below lists possible
modifications.
Logic Module Modifications