Laurel Electronics LTE: Ethernet & 4-20 mA Output Transmitter for Position or Rate from Quadrature Encoders - 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
Position or Rate from Quadrature Encoders
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
• Accepts low-level differential or single-ended 5V logic level signals from shaft
encoders, linear encoders, incremental encoders or optical encoders
• Programmable for position, angle or rate
• Quadrature count x1, x2 or x4 with combined pulse rate to 250 kHz
• Zero channel input
• 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
The Laureate quadrature transmitter accepts A & B quadrature
encoder signals to provide an analog output that tracks position,
length, angle, or rate. The A & B quadrature signals are 90° out
of phase, and their phase relationship determines whether up
counts (+) or down counts (-) are produced.
One, two or four quadrature transitions may be counted at a
maximum combined rate of 250 kHz and be scaled internally to
±999,999. counts. The input circuitry which may be jumpered for
either single-ended input signals or for balanced line driver
signals. Anti-jitter circuitry eliminates errors produced by vibration
of the encoder. In the event of a power failure, the current total
may be stored in non-volatile memory and can be used as the
starting point for counting when power resumes. Power fail or
zero index capabilities are alternate meter setup choices.
A zero index pulse, if available, is interpreted by the meter as
indicating a zero reference for an integral number of revolutions
of a rotary shaft encoder or the home position of a linear
encoder. It is used by the meter for initializing and to correct for
any cumulative pulse count errors. Special circuitry corrects for
width of the zero index pulse.
Available for Total or Rate
• With the Standard main board, the transmitter totalizes the
quadrature counts and then scales the total in software for the
output. A zero index Z signal can be added as a third input to
the A & B signals. The analog output is generated by an ultra-
linear 16-bit (65,536 step) digital-to-analog converter (DAC) for
0.02% output accuracy.
• With the Extended main board, the transmitter can be pro-
grammed to output either total or rate or rate. For example, the
output can track the speed of a moving slab from the RPM of
a roller. The update rate for rate is a programmed gate time
+ 30 ms + 0-2 pulse periods.
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.