Banner MULTI-BEAM Series - Manual

EM3T-1M Emitter and R1T3 Receiver
Optical Data
Transmitter System
The MULTI-BEAM Optical Data Transmitter Sys-
tem is also used in conjunction with the Banner
model MP-8 Multiplexer Module for multiple-
sensor arrays used for profile measurement and
"curtain of light" applications. See data sheet
03421 for further information.
standards 1, 3, 12, and 13.
OPERATING TEMPERATURE RANGE:
-40 to +70 degrees C (-40 to +158 degrees F).
RANGE: 200 feet (60m). See excess gain curve,
page 2.
Printed in USA 03321A4B
MULTI-BEAM ®
The MULTI-BEAM Optical Data Transmitter System provides a simple and very eco-
nomical method for transmitting logic-level data over a modulated LED light beam. It
is ideal for communication with overhead cranes and other rail-mounted control
systems. It is also often used to carry data to or from rotary index tables, and in such
applications replaces mechanical brush contacts.
The data transmitter consists of a special MULTI-BEAM emitter scanner block (model
SBEM3) and dc power block (model PBT-1M). Emitter assembly model EM3T-1M
uses a modulated infrared LED that is gated "on" and "off" by the data signal via an
optical coupler in the power block. The light is inhibited (turned "off") when current is
applied to the optical coupler.
The data receiver (model R1T3) is composed of standard MULTI-BEAM components:
scanner block SBR1, power block PBT, and on/off logic model LM3. The output is an
open-collector NPN transistor that "follows" the action of the data stream. The LIGHT/
DARK operate jumper on the logic module may be used to program the output so that
a logic "1" is represented by the presence or absence of the light signal from the emitter.
A PNP (current sourcing) output is available by substituting power block model PBP,
or by ordering assembled receiver model R1P3. See the specifications and hookup
diagrams for 3- & 4-wire dc power blocks (data sheets 03499) for detailed information.
Data may be transmitted over a distance of up to 200 feet (60 m) in a clean environment
(see excess gain curve). The data rate (BAUD rate) is limited by the modulation
frequency (30 kHz) and by the receiver response. The R1T3 receiver will respond to a
change in data state (light or dark) of 1 millisecond or longer, resulting in a theoretical
maximum data rate (assuming a square wave) of 500 BAUD. This suggests a maximum
practical data rate of 300 BAUD. The receiver scanner block may be modified for 300
microsecond (3 times faster) response. Contact the factory for further information.
SUPPLY VOLTAGE: 10 to 30V dc, 10% maximum ripple.
EM3T-1M 100mA maximum; R1T3 30mA maximum, exclusive of load.
INPUT SIGNAL: the input consists of the LED portion of an optical coupler. NOTE:
a suitable series resistor (customer supplied) must be installed to limit current to
betweeen 10 and 30mA dc. When current is applied to the LED, the 30kHz carrier is
inhibited.
OUTPUT CONFIGURATION: open-collector NPN transistor (sinks current to
negative side of supply), 250mA maximum. On-state voltage drop less than 1V dc; off-
state leakage current less than 10 microamps.
RESPONSE TIME: 1 millisecond ON and OFF. Maximum data rate: 300 BAUD.
INDICATOR LED: red LED on top of R1T3 receiver. Banner's exclusive, patented
Alignment Indicating Device (AID™) lights the LED whenever the receiver detects the
light from the EM3T-1M, and pulses the LED at a rate proportional to the received light
level. It will go "off" with current applied to the modulator input.
CONSTRUCTION: same as standard MULTI-BEAMs. Reinforced VALOX
® hous-
ing with components totally encapsulated. Stainless steel hardware. Meets NEMA
SPECIFICATIONS, Optical Data Transmitter System
Functional Schematic and Hookup Information
WARNING
This photoelectric sens-
ing system does NOT
include the self-check-
ing redundant circuitry
necessary to allow its
use in personnel safety applications. A
sensor failure or malfunction can result in
either an energized or a de-energized out-
put condition.
Never use this product as a sensing device
for personnel protection. Its use as a safety
device may create an unsafe condition which
could lead to serious injury or death.
Only MACHINE-GUARD and PERIM-
ETER-GUARD Systems, and other sys-
tems 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 de-
signed to meet these standards, and they
must NOT be used as sensing devices for
personnel protection.
!