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Dual Pulse Input Totalizer
Modbus or Laurel ASCII Protocol Serial I/O Transmitter
Rate or total in same
transmitter, square root extraction.
DIN Rail mounted, digitally
programmable.
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Features
Standard Main Board
Extended
Main
Board
- All capabilities
of the Standard Counter, plus:
- Channel A total and Channel B
rate simultaneously.
- Up/down counting on Channel A,
using Channel B to control count direction.
- Counting on Channel A, using
Channel B to inhibit counting.
- Arithmetic functions A+B, A-B,
AxB, A/B, A/B-1 (draw).
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Description
Universal
Pulse or AC Input Signal Conditioner
Laureate TM Series serial
output,
pulse input totalizer transmitters accept two independently scalable input
channels 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 pulse rates can be as high as 1
MHz.
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With a Standard Main Board,
the transmitter output can be scaled to engineering units, for
example to transmit totalized flow in gallons from a flow meter output.
Square root extraction is standard.
-
With an Extended Main Board, the transmitter output can track rate or totalized rate (such
as gallons) whether the transducer output is linear,
requires square root extraction, or requires custom curve linearization.
The latter can be provided by a curvilinear spline fit with up to 180
data points. The transmitter can also
count up to a preset total or down from a preset total to zero. Such
applications typically make use of optional dual solid state relays,
which are available as options. External reset of totals can be via
Modbus commands or via a
special three-position screw terminal connector. The two input channels
A & B can also be combined arithmetically to provide an analog
transmitter output that tracks A+B (e.g., sum of two flows), A-B (e.g.,
difference of two flows), AxB (e.g., horsepower as product of force and
RPM), A/B (ratio of two flow), or A/B-1 (draw or relative elongation of
material between rollers).
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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Specifications
Laureate Serial I/O Transmitter,
Dual
Pulse Inputs for Total or Rate
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Pulse Input |
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Types
Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce |
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). |
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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 |
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 |
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Typical
Applications |
Up/Down Totalizing |
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Up/down totalizing is provided by a mode
of the Extended totalizing transmitter where pulses are either added or subtracted on Channel A based on
a direction input on Channel B. The unit can also be programmed so that counting by
Channel A is inhibited by an input on Channel B. |
Combining Two Totals |
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A+B, A-B, A/B and AxB arithmetic functions are
available with the Extended totalizing transmitter. A+B can sum two totals, while A-B subtracts the outflow
total from inflow total. A/B ratio applied to two totals helps assure the proper mixing of
components. |
Up or Down Counting with Preset |
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A single Laureate
dual-channel totalizing transmitter will handle two repetitive fill
operations by counting from zero up to a preset, or down from a preset to
zero. The dual relay option is required. |
Machine ON Time and Utilization |
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An easy way to measure the ON time of
machines is to count AC line cycles and scale the total to hours. To display machine
utilization or duty cycle in percent, use the Extended totalizing
transmitter. Connect Channel A to
switched AC and Channel B to the AC line, and apply a 100 multiplier to the
A/B ratio. |
Total and Rate Simultaneously |
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The Extended version of the Laureate dual
channel totalizing transmitter can transmit scaled rate or total for the same channel at the push of a
button, and alarm both the rate and total. The Extended version can also do
curve linearization, thereby extending the working range and accuracy of flow
transducers. |
Pinout
Laureate Serial Output Transmitter,
Dual
Pulse Inputs for Total or Rate
(shown with optional analog output
and dual relay
output)
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Transmitter
Powering a Single Sensor
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Transmitter
Powering Two Sensors |
Transmitter with Active or Passive Sensors |
Ordering
Guide
Modbus or Laurel ASCII Protocol Serial I/O Transmitter,
Dual
Pulse Inputs for Total or Rate
Create a
model number in this format: TM2020FR. This example calls out a
Modbus output transmitter, Standard main board, 95-240
Vac power, isolated dual solid state relays, no analog output, and
dual channel pulse input signal conditioner. Includes plug-in screw
clamp
connectors.
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Transmitter
Type |
TM Laureate Transmitter, Modbus or Laurel
protocol. |
$210 |
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Main
Board |
6 Standard Main Board.
8 Extended Main Board
Note:
Extended allows rate and total simultaneously,
arithmetic functions (A+B, A-B, A/B, AxB, A/B-1),
batching, linearization of nonlinear inputs. |
NC
$40 |
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Power |
0 Isolated 95-240 Vac & 90-300 Vdc
1 Isolated 12-30 Vac & 10-48 Vdc. |
NC
$30 |
Setpoint
Output |
0 None.
2 Isolated Dual Solid State Relays. |
NC
$30 |
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Analog
Output |
0 None.
1 4-20 mA or 0-10V analog output. |
NC
$25 |
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Input
Type |
FR Dual-Channel Pulse Input.
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NC |
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Accessories |
CBL03 RS-232 cable, TM to computer.
CBL02 USB to RS-232 cable adapter. |
$19
$39 |
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Order from
distributors for shipment to USA or Canada. |
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Order online for
international shipment. |
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