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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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Sum,
Difference, Ratio, Product for Rate or Total with 2 Input
Channels
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Modbus or Laurel ASCII Protocol Serial I/O Transmitter
DIN
Rail mounted, digitally programmable.
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Click
to Order Transmitter for Sum, Difference, Ratio, Product of 2 Pulse Input Signals
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Features
Standard
Main Board |
Selectable Modbus or Laurel ASCII protocol. |
Modbus
RTU or ASCII modes, 2-wire connection, up to 247 digital
addresses. |
| Two
independently field-scalable pulse input channels. |
Internal
conversion of Channel A & B inputs to six-digit
readings:
- Digital span adjust from 0 to ±999,999.
- Digital zero adjust from -999,999 to +999,999. |
| Applicable
arithmetic functions: A+B, A-B, AxB, A/B, A/B-1 (draw). |
Frequencies
from 0.005 Hz to 1 MHz. |
| Inputs
from NPN or PNP proximity switches, contact closures,
digital logic, magnetic pickups down to 12 mV, or AC
inputs up to 250 Vac |
High
output update rate. |
| Square
root extraction standard. |
Isolated
5V, 10V or 15V dc excitation output to power
transducers. |
| DIN
rail mount package only 22.5 mm thick. |
Detachable
screw clamp plug connectors. |
| Easy
setup using Laurel's PC-based Instrument
Setup Software. |
Optional dual solid state
relays for alarm or control. |
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Description
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Two-Channel
Operation
Laureate
TM Series serial output, pulse input transmitters
accept two independently scalable input channels A
& B from a wide range of pulse sources, such
as NPN or PNP proximity switches, contact
closures, digital logic, magnetic pickups down to
12 mV, or AC voltages to 250 Vac. Input
frequencies can range from 0.005 Hz to 1 MHz. With
the Standard main board, the transmitter output
can be programmed to track rate or total for both
channels. With the Extended main board, as used in
the transmitters being presented in this web page,
the transmitter output can also be programmed to
track the sum, difference, product, ratio, or draw
of both channels: A+B, A-B, AxB, A/B, A/B-1. These
arithmetic operations can be applied to scaled
rates, scaled totals, square root of rates, totals
after square root extraction, custom curve
linearized rates, or totals after custom curve
linearization.
- Sum can
be used to add two flows for total flow, or to
add parts carried by two conveyor belts.
- Difference
can be used to subtract outflow from inflow
for net flow, or to subtract reject parts from
total parts.
- Product
can be used to multiply two rates, for example
to compute horsepower by multiplying
torque by RPM.
- Ratio
can be used to compare flow rates in two
channels, the RPM of rollers or gears, or the
speed of moving machinery, such as conveyor
belts. Ratio can also be applied to scaled
totals to compare two batches to be mixed. In
this application, one transmitter is used to
monitor the ratio of flow rates, and a second
transmitter to monitor the resulting batch
totals.
- Draw
is obtained by subtracting 1 from ratio. Draw
is used to measure the elongation of material
as it passes between rollers, or to monitor
variation in the speed of rollers for
tensioning.
Exceptional
Accuracy and Stability
 Laureate
pulse input frequency and rate transmitters
determine frequency by taking the inverse of
period as measured with a calibrated quartz
crystal time base. This results in extremely
accurate and stable 6-digit internal readings (±999,999
counts), which are then processed in software. The
output update rate is a programmed gate time + 30
ms + 0-2 signal periods. For a 60 Hz signal, the
update rate would be 20 per second. Such fast
update rates are ideal for alarm and control
applications.
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
Laurel 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.
- 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 Transmitter for Sum, Difference, Ratio, Product of 2 Pulse Input Signals
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General
Specifications
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Pulse Input |
Types
Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Arithmetic Functions |
AC, pulses from NPN, PNP
transistors, contact closures, magnetic pickups.
1 MHz.
250 kHz.
Common ground for channels A & B.
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V).
250 Vac
1 MHz, 30 kHz, 250 Hz (selectable).
0, 3, 50 ms (selectable).
Quartz crystal calibrated to ±2 ppm.
A+B, A-B, AxB, A/B, A/B-1 |
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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) |
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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 |
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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 |
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Operating Temperature
Storage Temperature
Relative Humidity |
0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing |
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Typical
Applications
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Controlling
the Mixing Ratio of Two Fluids
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Transmitting and alarming the input
flow rate ratio of two fluids (gas or liquid) allows these to be mixed
in a predetermined ratio in continuous processes. The sensing element
is normally a turbine flow meter, which outputs pulses at a frequency
proportional to flow rate. The A/B ratio can also be transmitted for
totalized rate (or delivered volume). |
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Comparing
Fluid Inflow & Outflow
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The ratio of the inflow and outflow
rates of a tank is a measure of the relative filling or emptying rate.
The same transmitter can also be programmed to transmit the net inflow
or outflow rate in flow units, or to transmit totalized inflow our
outflow in volume units. Any of these parameters can be alarmed using
the dual relay board and be transmitted via 4-20 mA. |
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Controlling
Coating Thickness on a Film
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In this application, Channel A
measures the rate at which a coating material is applied, as measured
by a flow meter, while Channel B measures the speed of the film based
on pulses from a proximity switch. Transmitting and alarming the A/B
ratio assures that an even thickness of coating material is applied as
the speed of the film is varies. |
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Synchronizing
Two Conveyor Lines
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The dual-channel Laureate transmitter
can measure the speed of conveyor lines by using the output of
proximity switches which sense gear teeth or spokes of rotating drive
wheels. Transmitting the speed ratio of two lines allows line speeds
to be adjusted so that material arrives at work stations when needed. |
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Measuring
Draw for Elongation
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Draw (Ch A / Ch B - 1) can be used to
indicate the elongation of films compressed between rollers, the
shrinkage films, and the RPM difference of rollers whose speed is
varied to maintain tension. The high resolution of Laureate dual
channel transmitters is ideal for comparison of rates that are close
to each other |
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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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