Laurel-electronics LT: 4-20 mA & Serial Data Output Transmitter f Uživatelský manuál stáhnout pdf

LAUREL

ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1

LAUREL

ELECTRONICS, INC.

4-20 mA & Serial Data Output

Transmitter for Duty Cycle Input

Features

• Transmits ON or OFF period as a percentage of total period

• Frequencies from 0.005 Hz to 10 kHz

• Inputs from NPN or PNP proximity switches, contact closures, digital logic,

magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.

• 4-20 mA or 0-10V transmitter output, jumper selectable, isolated

• Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span

• RS232 or RS485 serial data output, half or full duplex, isolated

• Modbus RTU, Modbus ASCII or Laurel ASCII protocol

• 5V, 10V or 24V dc transducer excitation output, isolated

• Dual solid state relays for alarm or control, isolated

• Universal AC power, 85-264 Vac, or low voltage power, 10-48 Vdc or 12-32 Vac

• Custom curve linearization and rate from successive readings (optional)

Description

The Laureate duty cycle transmitter tracks ON or OFF period

as a percentage from 0% to 100% of total period of repetitive

pulse trains. In the illustration, duty cycle is 100 x t/P. The trans-

mitter determines duty cycle by averaging an integral number of

periods over a gate time, which is selectable from 10 ms to

199.99 s. The same signal is applied to Channels A and B. The

unit divides the average pulse width by the period between

pulses and expresses this ratio in percent. A resolution of 1%,

0.1% or 0.01% is selectable. By selecting leading or falling pulse

edges, the ON or OFF duty cycle can be transmitted.

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 AC

signals from 12 mV to 250 Vac. Jumper selections provide opti-

mum operation for different sensor types and noise conditions.

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).

Standard features of Laureate transmitters include:

•

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.

•

Serial communications output, isolated. User selectable

RS232 or RS485, half or full duplex. 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.

•

Dual solid state relays, isolated. Available for local alarm or

control. 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.

•

Universal 85-264 Vac power. Low-voltage 10-48 Vdc or

12-32 Vac power is optional.

1 2 3 4

Shrnutí obsahu

Strany 1

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 1 LAUREL ELECTRONICS, I

Strany 2 - Specifications

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 2 Specifications Duty Cy

Strany 3 - Application Example

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 3 Pinout Mechanical Ap

Strany 4 - Ordering Guide

LAUREL ELECTRONICS INC., 3183-G Airway Ave., Costa Mesa, CA 92626, USA • Tel 714-434-6131 • www.laurels.com 4 Ordering Guide Create

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