LIM-2 Logic Inspection Module

Plug Logic
LIM-2
Logic Inspection Module
• Coordinates a gating signal with data from an inspection sensor
for accept/reject and other similar control applications
•
Inputs may be derived from contact closures or any dc sensor
(or sensing system) with NPN (sinking) output
•
Programmable to replace many dedicated-function Banner logic
modules
OS-8 socket sold separately
General
The model LIM-2 logic inspection module may be used in nearly any high-speed
inspection application where it is necessary to know whether an event did or did not
occur within a specified time period, or "gate window". Typical LIM-2 applications
include:
Missing part detection No bottle/no fill control
Die protection
Full case inspection
Code reading ("train logic") Rotary index table inspection
Inspecting for foreign objects Low fill level monitoring
Three typical LIM-2 applications are discussed on pages 3 through 6.
The LIM-2 operates on signals derived from contact closures or dc-type photoelectric
or proximity sensors having an NPN sinking output transistor. Easily-accessible internal
logic (DIP) switches enable customer-programming of eight different inspection
variables including input response times, signal polarities, and output characteristics
(see Table 1, page 2). This high level of versatility means that the LIM-2 can often
replace other types of logic modules (e.g. Banner B4-2-1500B, BIC-2, DP1A, and
WARNING Module model LIM-2, described in this data sheet,
does NOT include the self-checking redundant circuitry necessary to allow
its use in personnel safety applications. A sensor or module failure
or malfunction can result in either an energized or a de-energized output
condition.
Never use these products for personnel protection. Their use as safety
devices may create an unsafe condition which could lead to serious injury or death.
Only MACHINE-GUARD and PERIMETER-GUARD Systems, and other systems so designated,
are designed to meet OSHA and ANSI machine safety standards for point-of-operation
guarding devices. No other Banner sensors or controls are designed to meet these standards,
and they must NOT be used as sensing devices for personnel protection.
TL2A) while providing additional capabilities
not found in those original modules (Table 2,
page 6).
The LIM-2 module measures 3.0 x 3.0 x 1.5
inches, and plugs into a standard octal socket
such as the Banner OS-8 (sold separately). Up
to 256 field-programmable operating modes are
possible.
Operation
At the beginning of the GATE signal, the LIM-2
begins to look for a DATA signal caused by an
external event. At the end of the gate window,
either of two outputs is possible: a DATA OUT
(data present = output) signal at pin #6 of the
LIM-2, or a DATA OUT (data absent = output)
signal at pin #8.
As is shown in Figure 1, if a DATA signal occurs
during the gate window, a DATA OUT signal is
put out. This DATA OUT signal is programmable
to either an adjustable one-shot pulse or a latch
condition. In the latch condition, the DATA OUT
signal continues until a subsequent gate window
does not experience a DATA signal. As shown
Figure 1
LIM-2 Timing Diagrams
Figure 2
Printed in USA
P/N 03307D4B

Switch
Table 1. LIM-2 Programming Options
Number "ON" Position "OFF" Position
1 Gate input has 10 millisecond response time
Gate input has 1 millisecond response time
2
3
4
Data input has 10 millisecond response time
GATE signal is entered when pin #5 is "low" (logic 0)
DATA signal is entered when pin #3 is "low" (logic 0)
Data input has 1 millisecond response time
GATE signal is entered when pin #5 is "high" (logic 1)
DATA signal is entered when pin #3 is "high" (logic 1)
5
6
7
8
Gate window remains open for as long as the GATE
signal is present
Data may be entered at any time during the gate window,
or it may be continuous
Outputs latch in their last state until the end of the next
gate window
Output one-shot time is adjustable from .05 to 1 second
Gate window occurs only at the leading edge of the gate
input
A data transition must occur while the gate window is
open
Appropriate output energizes for a one-shot pulse at the
end of each gate window
Output one-shot time is adjustable from .005 to .1 second
Specifications, model LIM-2 Logic Inspection Module
Supply Voltage:
10 to 30V dc at 25mA (exclusive of loads); may be supplied by MAXI-
AMP model CP12C or CP12RC power supply module (see product
catalog or data sheet P/N 03460 for more information).
Outputs:
Two NPN open-collector transistors (DATA OUT and DATA OUT);
maximum current sink 150mA each.
In the one-shot mode, the appropriate output pulses for an adjustable
time (.005 to 1 second) at the end of each GATE signal.
In the latched mode, the outputs are latched in the appropriate state (one
or the other conducting) at the end of each GATE signal.
Response Time:
Selectable to 1 millisecond or 10 milliseconds.
Indicators:
Four LEDs indicate the presence of the following signals: GATE, DATA
IN, DATA OUT, and DATA OUT.
Input Requirements:
For logic level signals, logic "low" must less than 2V dc, and logic
"high" must be an open circuit or a voltage greater than 6V dc. Input
device(s) must be capable of sinking 4ma.
Construction:
3.0 x 3.0 x 1.5 inch plug-in module with standard octal base. NEMA
1 anodized aluminum enclosure.
The octal base of the LIM-2 fits the Banner model OS-8 octal socket
(order separately).
Dimensions, model LIM-2
LIM-2 Basic Hookup
LED indicators behind the transparent module top cover indicate
the presence of GATE, DATA, DATA OUT, and DATA OUT.
Logic programming (DIP) switches and the one-shot pulse duration
adjustment potentiometer are also located behind the easilyremoveable
top cover.
2

A Die Protection Application
Using the LIM-2 Logic Inspection Module
The Application
One part is ejected during each cycle of a blanking press. A photoelectric light screen is used to detect the blanked parts as they are ejected
from the press. The press is immediately stopped if an ejected part is not sensed before an upstroke is completed. This system prevents serious
damage to the blanking die and/or press which can result when a blanked part becomes stuck in the press.
The System
An ejected part is propelled through a defined area. Its motion is random as it tumbles out of the throat of the press and into an accumulator bin.
Parts which present a profile of 0.2 inches or more in cross section may be reliably sensed passing anywhere through the 3.5 inch high window
of an LS10 light screen sensor pair. The LS10 sensors may be separated by up to 48 inches (see data sheet P/N 03557).
Logic for the die protection is supplied by an LIM-2 module. The DATA signal is supplied by the LS10R receiver, which outputs a pulse to the
LIM-2 each time a part passes through the light screen. The current sinking (NPN) output of the light screen receiver is used.
The GATE signal is supplied by a metal proximity sensor which outputs a short signal near the end of each press upstroke. The GATE signal is
generated by a metal cam that is attached to the flywheel shaft which moves past the sensor as the die opens. A normally open current sinking
(NPN) output of the proximity sensor is connected to the gate input of the LIM-2.
The entire system is powered by a CP12RC dc supply module. The control signal from the LIM-2 is routed back to the CP12RC to switch its
built-in relay which, in turn, interfaces directly to the start/stop circuit of the blanking press.
Theory of Operation
The LIM-2 is programmed so that the gate window is the entire time
period between consecutive gate sensor input signals (i.e. when the gate
input is "high", switch #3 "off"). If an ejected part is sensed by the light
screen at any time during the gate window, the press continues to cycle
(see timing diagram, below). If no part is sensed during a gate window,
the LIM-2 signals the machine control to shut down immediately at the
end of that gate window.
The data input is programmed (by switch #5) for ac-coupled response.
This means that the LIM-2 must recognize a transition at the data input
during the gate window. A transition occurs at the data input each
time that a blanked part passes through the light screen. If the light
screen becomes continuously interrupted by dirt, sensor misalignment,
a stuck part, etc., the LIM-2 will sense this as a fault condition and
stop the press.
Timing Diagram
Application Concept
Larger or Smaller Parts
The characteristics of the ejected parts determine selection of the most
reliable and cost-effective light screen. Parts with a minimum profile of
less than 0.2 inches may be detected by using model OSBFAC, together
with rectangular opposed
individual fiber optic assemblies
(see product data
sheet P/N 03553). Parts
with a minimum profile of
0.45 inch and greater, and
which tumble through an
area larger than 3.5 inches
by 4 feet, may be sensed
using a Banner BEAM-AR-
RAY sensor pair (see data
sheet P/N 03526).
Hookup Diagram
3

A Flow Control Application
Using the LIM-2 Logic Inspection Module
The Application
Parts are processed through a heat
tunnel on a continuous motion
conveyor. Opposed mode photoelectric
sensors are placed at the
entrance and exit of the heat tunnel to
monitor part flow. An LIM-2 and an
LSR-64 shift register module process
the information from the sensors
and activate an alarm if a part does
not emerge from the tunnel when it
should. The length of the parts and
the spacing between adjacent parts
may be random.
Application Concept
The System
A narrow beam is established near
both the entrance and the exit of the
heat tunnel using SM30 Series sensors
with rectangular aperture assemblies
on the emitter and the receiver. The
Bi-Modal receiver outputs are wired
for dark operate and sinking (NPN)
operation.
When the beam of the entrance sensors
is blocked, data is input to the LSR-64
shift register. The length of the part
corresponds to the number of clock
pulses entered during the time that
the entrance beam is blocked. Clock
pulses are generated using an ECONO-
BEAM SE61E/SE61R combination as
a slot sensor to count pulses produced
by a timing sprocket attached to one
of the conveyor drive shafts.
The LSR-64 is programmed to output
when the part is clocked to the exit of
the tunnel. This information becomes
the gate input for the LIM-2. The exit
sensors supply a DATA signal to the
LIM-2 when the beam is blocked by
an exiting part. The exit sensors must
“see” the leading edge of an exiting part
at any time during the gate period in
order to prevent an alarm.
Hookup Diagram
Timing Diagram (assumes shift length of 5)
4

An Inspection/rejection Application
Using the LIM-2 Logic Inspection Module
The Application
Opposed mode photoelectric sensors are used in this application to inspect spray cans for the presence or absence of a cap. The cans are also
checked for caps that are not completely seated on the can. The caps are in various colors of opaque vinyl plastic. This inspection is coordinated
by a model LIM-2.
The System
The GATE signal for the LIM-2 is generated by a pair of MINI-BEAM sensors. The gate beam is positioned so that it is interrupted by the main
body of each can. The time that the gate beam is interrupted by the can corresponds to the duration of the gate window.
Inspection is accomplished using two opposed beams, one to check for a missing cap and the other to check for a high (or crooked) cap. The
beam for missing-cap detection is located comfortably beneath the top surface of the cap. The beam for high-cap detection is positioned just
above the highest point of the cap, so that the beam is interrupted only by a cap that is not fully seated. Either of these two MINI-BEAM sensor
pairs supplies data to the LIM-2.
Reject cans are ejected by a solenoid at a reject station that is
downstream from the inspection point. A model LSR-64 shift
register module is used to track reject cans between the two
locations. The CLOCK input signal for the shift register is
generated using the ECONO-BEAM SE61E and SE61R which
are configured as a slot sensor to count pulses produced by a
timing sprocket attached to one of the conveyor drive shafts.
A model BTR-1A is used to interface the shift register output
to an ac reject solenoid. The BTR-1A is an infinite-life (solidstate)
relay. Its use also eliminates the possibility of generating
EMI and/or RFI from contact arcing.
The hookup diagram for this system is shown on page 6.
Timing Diagram
5

Hookup, Inspection/rejection Application (continued from page 5)
Switch settings (beneath module cover)
Model Description Notes
1 2 3 4 5 6 7 8
B4-2-1500B
One-shot
inspection/rejection
Table 2. Using the LIM-2 to Replace other Banner Modules
OFF
OFF
ON
ON
OFF
ON
OFF
ON
Product sensor (interrogate) input at pin #5;
Inspection sensor (data) input at pin #3;
Output (pulse) at pin #8
BIC-2
"Flip-flop"
(toggle)
OFF
OFF
ON
ON
OFF
ON
ON
OFF
Jumper pin #8 to pin #3;
Input at pin #5;
Output at pin #6
DP-1A
Interrogation module;
Die protection & other
inspection sequences
ON
OFF
OFF
ON
ON
OFF
ON
OFF
Cycle input (set) at pin #5;
Part detection (reset) at pin #3;
Output (latch) at pin #6
TL2A
Train logic module
for code reading or
"no can/no fill"
OFF
OFF
ON
ON
OFF
ON
ON
OFF
Strobe input at pin #5;
Data input at pin #3;
Output (latch) at pin #6
WARRANTY: Banner Engineering Corporation warrants its products to be free from defects for one year. Banner Engineering Corporation will
repair or replace, without charge, any product of its manufacture found to be defective at the time it is returned to the factory during the warranty
period. This warranty does not cover damage or liability for the improper application of Banner products. This warranty is in lieu of any other
warranty either expressed or implied.
Banner Enginnering Corp. 9714 10th Avenue No. Minneapolis, MN 55441 Telephone: (763) 544-3164 FAX (applications): (763) 544-3573