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Isolated, Process Current Output 7B39
FEATURES
Interfaces, isolates and filters a 0 V to + 10 V or +1 V to +5 V input signal. Provides an isolated process current output of 0 mA to 20 mA or 4 mA to 20 mA across loads of 0 to 850 . All 7B39 series modules are mix-and-match and Hot Swappable.
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Industrial signal conditioning Industrial signal isolation Industrial signal filtering
Figure 1. 7B39 Functional Block Diagram
PRODUCT OVERVIEW
The 7B Series of signal conditioners feature small size, low cost and a wide output voltage range for a variety of applications including process control and factory-floor environments. The single-channel 7B modules accept inputs from a range of transducers and are fully rated over the extended -40oC to +85oC industrial temperature range. All 7B Series modules are 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 pinout 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 and extraneous voltages which frequently accompany the signals.
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 offers up to 1500 V rms continuous common mode voltage isolation and 120 V rms of field wiring input protection. The power supplies necessary to drive each of the individual module's input circuitry are internally isolated, enabling the 7B Series modules to offer true channel-to-channel isolation of the input signals. 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 rackcompatible 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.
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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. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
7B39 GENERAL DESCRIPTION
The 7B39 is a single-channel signal conditioning current output module that interfaces, isolates and filters a 0 V to +10 V or +1 V to +5 V input signal and provides an isolated process current output of 0 mA to 20 mA or 4 mA to 20 mA across loads of 0 to 850 . The output current appears at the 7B Series backplane screw terminal block. Model 7B39 features a nonlinearity of +0.02% maximum and an accuracy of +0.1% maximum (+0.01% typical). Providing 1500 V rms of galvanic transformer based isolation, output-to-input and power, the 7B39 offers a common mode rejection (CMR) of 110 dB @ 50/60 Hz to preserve the integrity of low level signals in noisy environments. The 7B39 is mix-and-match and hot-swappable with other 7B Series modules, so it can be inserted or removed from any socket in the same backplane without disturbing system power. Model 7B39 is rated to operate with a nominal +24 VDC supply. The input signal from the user's system is buffered and then used to modulate the amplitude of a square wave carrier. The modulated signal is transmitted across the signal transformer and demodulated to retrieve the original input voltage signal. This voltage is then filtered by a two-pole low pass 100 Hz filter, buffered and converted to a current output signal. The nominal +24 VDC module supply voltage powers the input side of the 7B39. The oscillator on the input side provides the square wave carrier signal used by the modulator and also drives the power transformer. The signal at the secondary of the transformer is used in the demodulator and is also converted to a DC voltage that powers the circuit on the module's output. The floating isolated current output of Model 7B39 is fully protected to 120 V rms line voltage.
Figure 2
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7B39
7B39 Models Available
Model 7B39-01 7B39-02 +1 V to +5 V 0 V to +10 V Input Range +4 mA to +20 mA 0 mA to +20 mA Output Range
7B39 Specifications (typical @ +23C 5C and Vs = +24 V dc)
Description Output Range (RL = 0 to 850 ) Standard Range Custom Ranges Input Range 0 mA to 20 mA or 4 mA to 20 mA (30 mA, maximum) Not Available* 0 V to +10 V or +1 V to +5 V Accuracy1 Initial @ +25C Nonlinearity
2
Model 7B39
0.01% Span (0.1% Span, maximum) 0.02% Span, maximum 25 ppm/C 0.0035% Span/C Input Resistance
Span vs. Temperature Output Offset vs. Temperature
Power ON Model 7B39-01 Model 7B39-02 Power OFF 2M 40 k 30 k , minimum Output Noise 5 MHz Bandwidth 10 Hz to 100 kHz Bandwidth 10 Hz to 100 kHz Bandwidth Bandwidth, -3 dB Output Rise Time, 10% to 90% Span 160 A peak 4 A peak 25 nA peak 100 Hz 3 ms Common-Mode Voltage (CMV) Output-to-Input and Power 1500 V rms continuous Common Mode Rejection (CMR) Output-to-Input and Power @ 50/60 Hz Input Protection Ouput Transient Protection 110 dB 35 V dc, continuous 120 V rms, continuous ANSI/IEEE C376.90.1-1989 IEEE-STD 472 IEC 255-4, Class II
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7B39
Power Supply Voltage Range, Operating Current Sensitivity Mechanical Dimensions Weight +14 V dc to +35 V dc +60 mA, maximum 0.0001%/% of Vs 1.663" x 2.11" x 0.563" (42.24 mm x 53.6 mm x 14.3 mm) 60 grams Environmental Temperature Range Operating Storage Relative Humidity, 24 hours ESD Sensitivity RFI Susceptibility
Warm-up time required to meet specifications is approximately 10 minutes. * Contact factory for OEM requirements. 1 Includes the combined effects of repeatability, hysteresis, and nonlinearity. 2 Nonlinearity is calculated using best-fit straight line method. Specifications subject to change without notice.
-40C to +85C -40C to +85C 0 to 90% @ +60C non-condensing IEC 801-2, Level 2 0.5% Span error @ 400 MHz, 5 Watt, 3 ft
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7B39 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 7B39 Input Field Connections
Table 1. Pin Function Descriptions--
Pin No. 0 1 2 3 4 5 Input Module Function SENSOR INPUT INPUT HIGH INPUT LOW POWER SUPPLY (DC) OUTPUT VOLTAGE OUTPUT & POWER COMMON Output Module Function NOT USED OUTPUT HIGH OUTPUT LOW POWER SUPPLY (DC) INPUT VOLTAGE INPUT AND POWER COMMON
Figure 4 . Model 7B Series Module, with pin-out assignments.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
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7B39 OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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7B39 NOTES
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7B39 NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05179-0-10/04(0)
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