Modbus & Serial Output Transmitter
&
Dual Pulse Input Totalizer
Rate
or total in same transmitter, square root extraction.
DIN Rail mounted, digitally programmable.
Description
The Laureate
Modbus &
serial output,
pulse input totalizer transmitter accepts 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.
-
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 is 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).
 The dual-channel signal
conditioner used for pulse detection accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from
12 mV to 250 Vac. Jumper
selections provide optimum operation for different sensor types and noise
conditions. A built-in 5V, 10V or 24V dc
excitation supply can power proximity switches and other sensors, and eliminate the need
for an external power supply.
LTM Series serial
output transmitters send data via an isolated serial port, which is user
configurable for RS232 or RS485 and full or half duplex operation. Three
protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation
is fully compliant with Modbus Over Serial Line Specification V1.0 (2002).
The 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 Datalogging Software.
Standard features of Laureate
transmitters include:
- Serial data output, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or
Laurel ASCII protocol.
- Dual solid state relays for control or alarm, isolated.
Rated 120 mA at 130 Vac or 170 Vdc.
- Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50
mA.
-
Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA,
0-20 mA or 0-10V levels.
- Universal AC power supply for 85-264 Vac.
Easy Transmitter programming is via
Laurel's Instrument Setup Software,
which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from
Laurel (P/N CBL04).
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Specifications
Laureate Modbus & Serial Output Transmitter
& Dual Pulse Input Totalizer
|
Pulse Input |
|
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) |
|
Serial Data Output
(standard) |
|
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS232 or RS485 (half duplex)
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) |
|
Transducer Excitation Output (standard) |
|
Output Levels
Output Isolation |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper
selectable)
50V from signal ground |
|
Dual Relay Output (standard) |
|
Relay Type
Load Rating |
Two solid state relays, SPST, normally open,
Form A
130 mA at 140 Vac or 180 Vdc |
|
Analog Output (standard) |
|
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load or higher)
16 bits (65,536 steps)
0.02% of output span
250V rms working, 2.3 kV rms per 1 minute test |
|
Power Input |
|
Standard Power
Low Power Option
Power Frequency
Power Isolation
Power Consumption |
85-264 Vac or 90-300 Vdc (DC operation not UL
approved)
10-48 Vdc or 12-32 Vac
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test
2W typical, 3W with max excitation output |
|
Mechanical |
|
Dimensions
Mounting
Electrical Connections |
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors |
|
Environmental |
|
Operating Temperature
Storage Temperature
Relative Humidity
Cooling Required |
0°C
to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan. |
|
Typical
Applications |
Up/Down Totalizing |
 |
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 |
 |
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 |
 |
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 |
 |
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 |
 |
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 Modbus & Serial Output Transmitter
& Dual Pulse Input Totalizer
Ordering
Guide
Laureate Modbus & Serial Output Transmitter
& Dual Pulse Input Totalizer
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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