Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Average Time of Periodic Events - 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 Average Time of Periodic Events
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
• Transmits average time of periodic events with width from 1 µs to 199.999 s
• Resolution to 0.2 µs, rep rated to 250 kHz
• Inputs from NPN or PNP proximity switches, contact closures, digital logic,
or magnetic pickups down to 12 mV
• Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span
• 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 time interval transmitter can transmit pulse width
or time delay between individual pulses to a resolution of 0.2 µs
for periodic events. It can also transmit average pulse width or
average time delay between multiple pulses.
Time interval is measured between inputs on channels A and B.
Timing starts when a pulse is applied to Channel A (selectable
positive or negative edge), and ends when a pulse is applied to
Channel B (selectable positive or negative edge). In case of a
single pulsed signal, the A and B inputs can be tied together. A
positive or negative slope may be selected to start timing, and
the opposite slope must be selected to stop timing. Timing is
achieved by counting 5.5 MHz clock pulses. Multiple integral time
intervals are averaged over a gate time which is selectable from
10 ms to 199.99 s and also controls the maximum output rate.
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.