7B35 판매점 - Isolated Process Current Input

7B35 반도체 회로 부품 판매점

Isolated Process Current Input

Analog Devices

Isolated Process Current Input

with Loop Power

7B35

FEATURES

Single-channel signal conditioning current input module

that interfaces with two-wire transmitters.

Module provides a precision output of either +1 V to +5 V or

+2 V to +10 V, linear with temperature.

Features a isolated 24 VDC loop supply for driving the

transmitter.

All 7B35 series modules are mix-and-match and Hot

Swappable.

FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS

Industrial signal isolation

Industrial signal filtering

PRODUCT OVERVIEW

Figure 1. 7B35 Functional Block Diagram

The modules feature a maximum nonlinearity of +0.02% and

are factory calibrated to guarantee a maximum accuracy

specification of +0.1%.

The 7B Series of signal conditioners feature small size, low cost

The 7B Series offers up to 1500 V rms continuous common

and a wide output voltage range for a variety of applications

mode voltage isolation and 120 V rms of field wiring input

including process control and factory-floor environments. The

protection. The power supplies necessary to drive each of the

single-channel 7B modules accept inputs from a range of

individual module’s input circuitry are internally isolated,

transducers and are fully rated over the extended -40oC to

enabling the 7B Series modules to offer true channel-to-channel

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+85oC industrial temperature range. All 7B Series modules are

isolation of the input signals.

rated for a nominal power supply input of +24 VDC; and, for

maximum flexibility, they will accept supply voltages in the +14

VDC to +35 VDC range. The input modules, with the exception

of the 7B21, provide a high-level output voltage that is factory

configured for either the +1 V to +5 V or 0 V to +10 V range.

The 7B21 is a unity gain, isolated input module with an

input/output range of +10V. Output modules are available that

provide either isolated process current or isolated bipolar

voltage output. Model 7B39 converts either a +1 V to +5 V input

to a 4 to 20 mA output or a 0 V to +10 V input to a 0-20 mA

output. The input/output ranges of the 7B39 are factory

configured. The 7B22 is a unity gain module that provides an

isolated +10V output signal. All modules have a universal pin-

out and may be readily hot-swapped under full power without

disrupting field wiring. Each module accepts analog transducer

signals and transfers them to a process control or factory data

collection system without the inherent noise, non-linearity, drift

The modules directly accept analog signals from

thermocouples, RTDs, current loop powered transmitters, and

other process control signals. The 7B Series modules amplify,

linearize, isolate, protect and convert the transducer output

signals to standardized analog inputs for high-level analog I/O

subsystems. The 7B Series Subsystem consists of 19-inch rack-

compatible hardware (model AC 1363), with universal

mounting backplane and a family of plug-in (up to 16 per

backplane) input and output signal conditioning modules. Four-

, eight-, and sixteen-channel backplanes are available. Each

backplane incorporates screw terminals for easy power

connections and field wiring, and includes a 25-pin D-type

connector for interfacing the high-level single-ended voltage

outputs to the user’s equipment. Gold-plated sockets are

provided on each channel of the backplane to ensure the

reliability of each module’s electrical connection.

and extraneous voltages which frequently accompany the

signals.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

www.analog.com

GENERAL DESCRIPTION

The 7B35 is a single-channel signal conditioning current input

module that interfaces with two-wire transmitters, providing an

isolated protected precision output of either +1 V to +5 V or +2

V to +10 V. Model 7B35 features an isolated 24 VDC loop power

supply for driving the transmitter. To accurately measure low

level signals in electrically noisy environments, 1500 V rms of

galvanic transformer-based isolation with a common mode

rejection (CMR) of 105 dB @ 50/60 Hz is provided. Rated to

operate with a nominal +24 VDC supply, Model 7B35 is mix-

and-match and hot-swappable with other 7B Series input

modules, so it can be inserted or removed from any socket in

the same backplane without disturbing system power.

The two input pins of Model 7B35 are each fully protected up to

120 V rms. The current input signal is converted to a voltage,

then filtered by a one-pole 100 Hz filter. Amplitude modulation

is used to implement transformer isolation (1500 V rms input-

to-output and power). Isolated front-end circuitry power is

supplied by a DC/DC converter. The isolated transmitter loop

power supply is unregulated and will provide a voltage that is

proportional to the voltage used to power the 7B35 module. The

7B35

isolated voltage provided by the 7B35 is between 13 VDC and

34 VDC for loop currents between 4 mA and 20 mA and supply

voltages between 20.4 VDC and 26.4 VDC. The output section

contains a two-pole low-pass filter (-3 dB @ 100 Hz), a buffer

amplifier and power oscillator. The two-pole output filter and

subsequent buffer ensures that a low noise, low impedance

(<1Ω) signal is available at the output to drive loads down to

2kΩ.

Figure 2

Rev. 0 | Page 2 of 8

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7B35 반도체 회로 부품 판매점

Isolated Process Current Input

국내 전력반도체 판매점

일반적인 전자부품 판매점

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