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Laurel Electronics
provides digital panel meters / controllers, totalizers, counters,
loop-powered meters, temperature meters, for all types of
transducers or process indication & control. |
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Quadrature
Position or Rate
Modbus or
Laurel ASCII Protocol Serial I/O Transmitter
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Transmits
accurate position or rate from quadrature encoders.
DIN Rail mounted, digitally programmable.
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Click
to Order Quadrature Position or Rate Transmitter
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Features |
| Selectable
Modbus or Laurel ASCII protocol.
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Modbus
RTU or ASCII modes, 2-wire connection, up to 247 digital
addresses.
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| Programmable
for position, angle or rate.
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Accepts
low-level differential or single-ended 5 V logic level
outputs from shaft encoders.
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| Quadrature
count x1, x2 or x4.
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Combined
pulse rate to 250 kHz.
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| Display
refresh rate up to 25/s.
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Zero
channel input.
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| Isolated
5V, 10V or 15V dc excitation output.
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DIN
rail mount package only 22.5 mm thick.
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| Detachable
screw clamp plug connectors.
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Easy
setup using Laurel's PC-based Instrument
Setup Software.
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| Optional
dual solid state relays for alarm or control.
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| Description
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Position,
Length or Angle Measurement
Laureate
Modbus I/O quadrature transmitters
accept the A & B
signals from shaft encoders to provide a highly accurate
reading of position, length, angle, or rate. The A & B
quadrature signals are 90º out of phase, and their phase
relationship determines whether up counts (+) or down counts
(-) are produced.
One,
two or four transitions
may
be counted at a maximum combined rate of 250 kHz and be
scaled internally from -999,999 to +999,999. counts. The
input circuitry which may be jumpered for either
single-ended input signals or for balanced line driver
signals. Anti-jitter circuitry eliminates errors produced by
vibration of the encoder. In the event of a power failure,
the current total may be stored in non-volatile memory and
can be used as the starting point for counting when power
resumes. Power fail or zero index capabilities are alternate
meter setup choices.
 A
zero index pulse,
if available, is interpreted by
the transmitter as corresponding to an integral number of
revolutions of the shaft encoder. It is used by the
transmitter to correct for any cumulative pulse count
errors. Special circuitry corrects for width of the zero
index pulse.
A built-in
isolated 5V, 10V or 15V dc excitation supply is available to
power shaft encoders and eliminate the need for an external
power supply.
Available
for Totals or Rate
- With the Standard main
board,
the transmitter totalizes the counts and then
scales the total in software for display and control. A
zero index signal can be added as a third input to the A
& B signals.
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With the Extended main
board,
the transmitter can can also output an analog
signal that tracks scaled rate. For example, the output
can track the speed of a moving slab or RPM of a roller.
The output update rate for position or rate is normally
set to a maximum of 25/sec, as determined by a
user-programmable gate time.
Serial
Data I/O & Programming
Laureate TM
Series transmitters send data as a serial digital signal.
RS485 or RS232 signal levels are jumper selectable and can
each be associated with either the Modbus protocol or
Laurel’s simpler Custom ASCII protocol.
- Modbus protocol
operation
is fully compliant with the Modbus Over
Serial Line Specification V1.0 (2002) for 2-wire,
half-duplex connection. This includes RTU or ASCII
modes, addressing of up to 32 devices per RS485 line
without a repeater, and up to 247 digital addresses.
Modbus operation allows devices by different
manufacturers to be connected in parallel and be
addressed using the same protocol.
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Laurel’s Laurel ASCII
protocol
allows up to 31 Laureate devices to be
addressed on the same RS485 data line. It is simpler
than the Modbus protocol and is recommended when all
devices are Laureates. It also allows use of Laurel’s
datalogging software.
Transmitter
programming
is via the unit's three-terminal serial port
using Laurel's PC-based Instrument
Setup Software. This software can be downloaded from
this website at no charge. The required transmitter-to-PC
interface cable is available from Laurel (P/N CBL03).
Laurel's serial output transmitters and meters can also be
part of PC-based data logging systems using Laurel's Datalogging
Software, which operates under the Laurel ASCII
Protocol. A single software command switches between the
Modbus and Laurel ASCII Protocols.
Transmitter
Options
Options include
dual solid state relays for local alarm or control and an
isolated 4-20 mA or 10V (selectable) analog output,
effectively providing a linearized analog transmitter output
that tracks the reading that would be transmitted digitally.
The analog output provides 12-bit (4096 step) resolution of
the output span and is ultra-linear to within one bit. Its
accuracy is ±0.05% of span for all signal types, except for
AC rms, where accuracy is ±0.1%. Output isolation from
signal and power grounds is provided by a separate on-board
power supply, which can drive 20 mA into a 500 ohm load for
10V compliance. Output isolation eliminates problems caused
by ground loops.
DIN
Rail Mounting
Laureate
transmitters are housed in a 35 mm DIN rail case that is
only 22.5 mm (0.89") thick. Signal connections are via
detachable screw clamp plug connectors.
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Click
to Order Quadrature Position or Rate
Transmitter
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Specifications
Laureate Serial I/O
Transmitter, Quadrature Input
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Quadrature Inputs
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Type
Transitions Monitored
Max Pulse Rate
Internal Counts
Position Error |
Differential or single-ended
quadrature
x1, x2 or x4
250 kHz at x1, 125 kHz at x2, 62.5 kHz at x4
-999999 to +999999
No error contributed by transmitter |
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Quadrature Position Mode |
Zero Adjust
Span Adjuste |
-999999 to +999999
0 to ±999999 |
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Quadrature Rate Mode |
Conversion Technique
Output Update Rate
Gate time
Time Before Zero Output
Time Base Accuracy
Zero Adjust
Span Adjust |
Inverse period
30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Calibrated to ±2 ppm
-999999 to +999999
0 to ±999999 |
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Serial I/O
(standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485 (default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002). |
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Transducer Excitation Output
(standard) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output
(optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance |
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Analog Output
(optional) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test. |
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Mechanical |
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Case Dimensions
Case Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing |
| Application
Examples |
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Using
Quadrature for Cutting to Length
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Controlling
the repetitive cutting of material to length is
an excellent application of the Laureate
quadrature transmitter.
The
quadrature encoder shares the shaft of a sensing
wheel, whose rotation corresponds to lineal
displacement of material. The transmitter
compares the displacement reading against
setpoint information, and then uses its dual
relays to first slow down and then cut the
material.
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Using
Quadrature for X-Y Positioning
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Accurate
X-Y position or rate can be obtained from two
shaft encoders, which convert linear position to
quadrature signals as a shaft turns. In addition
to serving as a transmitter, each Laureate can
use its optional dual relay setpoint capability
for closed loop control.
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Using
Quadrature to Monitor a Drilling Operation
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Quadrature
can be used to track position and vertical
drilling speed of the bit in an oil drilling
operation. A shaft encoder is rotated by a cable
that moves with the drilling shaft. In this
application, the same encoder signal is applied
to a Laureate quadrature transmitter for
position, and to a second quadrature transmitter
for rate. Both transmitters can send a 4-20 mA
signal to a control room and be alarmed.
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Click
to Order Quadrature Position or Rate
Transmitter
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Pinout
Laureate Serial
Output Transmitter, Quadrature Input
(shown with optional
analog output and dual relay output) |
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Quadrature
Transmitter with Differential or
Complementary Inputs
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Click
to Order Quadrature Position or Rate
Transmitter
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FLW,
Inc - 3505
Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 -
7512 - Fax (714) 751 - 0213
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