Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Dual Channel Pulse Totalizer Input - Manual

LAUREL ELECTRONICS INC. , 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1
LAUREL
ELECTRONICS, INC.
Ethernet & 4-20 mA Output Transmitter
for Dual Channel Pulse Totalizer Input
Features
• Ethernet Serial Data I/O, Modbus TCP or Laurel ASCII protocol
• 4-20 mA or 0-10V transmitter output, 16 bits, jumper selectable, isolated
• Dual 120 mA solid state relays for alarm or control, isolated
• 5V, 10V or 24V dc transducer excitation output, isolated
• Two independently field-scalable pulse input channels
• Up counting from zero to preset value using positive scale factor
• Down counting from preset to zero using negative scale factor
• Inputs from NPN or PNP proximity switches, contact closures, digital logic,
or magnetic pickups down to 12 mV, pulse rates to 1 MHz
• Digital span adjust from 0 to ±99,999, zero adjust from -99,999 to +99,999
• Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power
• Power over Ethernet (PoE) jumper selectable with 10-48 Vdc supply
Description
The Laureate 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 track total (such as gallons) or rate (such as gallons per
minute). Square root extraction is standard.
With an Extended Main Board, the transmitter can also:
• Count up to a preset or down from a preset to zero. Such
applications typically utilize the transmitter’s two solid state
relays, which are standard. External reset of totals is via a
special three-position screw terminal connector.
• Perform custom-curve linearization on rate or total, for
example to extend the range of transducers. Exceptionally
accurate custom-curve linearization is provided by a curvi-
linear spline fit with up to 180 data points.
• Combine channels A and B arithmetically so that the
transmitter output tracks A+B (e.g., sum of two flows or totals),
A-B (e.g., difference of two flows or totals), AxB (e.g., horse-
power as product of force and RPM), A/B (ratio of two flow or
totals), and 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 condi-
tions. 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.
Standard features of Laureate LTE transmitters include:
• Ethernet I/O, isolated. Supported protocols are Modbus
RTU and ASCII (tunneled via Modbus TCP) and Laurel ASCII.
The latter is simpler than the Modbus protocol and is recom-
mended when all devices are Laureates. Note that RS232 or
RS485 data I/O in lieu of Ethernet is provided by our LT Series
transmitters.
• 4-20 mA, 0-20 mA or 0-10V analog transmitter output,
isolated, jumper-selectable and user scalable. All selections
provide 16-bit (0.0015%) resolution of output span and 0.02%
output accuracy of a reading from -99,999 to +99,999 counts
that is also transmitted digitally. Output isolation from signal
and power grounds eliminates potential ground loop problems.
The supply can drive 20 mA into a 500 ohm (or lower) load for
10V compliance, or 10V into a 5K ohm (or higher) load for
2 mA compliance.
• Dual solid state relays, isolated. Available for local alarm
or control. Rated 120 mA at 130 Vac or 180 Vdc.
• Transducer excitation output, isolated. User selectable
5V@100 mA, 10V@120 mA or 24V@50 mA.
• Universal 85-264 Vac power. Low-voltage 10-48 Vdc or
12-32 Vac power is optional.
Discovery and configuration of Laureate Ethernet Nodes is
easily achieved with Laurel's Node Manager Software, and the
discovered transmitters can then be programmed using Laurel's
Instrument Setup Software. Both softwares run on a PC under
MS Windows and can be downloaded at no charge.