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Isolated, Field Configurable Analog Input 6B11 / 6B11HV
FEATURES
Single-channel isolated signal-conditioning modules. Accepts outputs from Thermocouple, millivolt, volt and current signals. Complete microcomputer-based data acquisition systems. Can be remotely reconfigured for various sensor types and input ranges.
modules can be configured for various sensor types, including RTD and thermocouple, and a wide variety of input ranges. This reduces the number of different modules that need to be used in a given application and carried in inventory. FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
Process Monitoring & Control Test Stand Automation Machine Monitoring Material Testing Remote Energy Mangement Laboratory Data Acquisition
Figure 1. 6B11 & 6B11HV Functional Block Diagram
PRODUCT OVERVIEW
The 6B Series delivers sensor-to-host signal-conditioning for remote applications. Software-configurable for a wide variety of sensor types, including: analog input, analog output, and digital I/O, the 6B Series is intended for remote data acquisition, machine monitoring, remote energy management and process monitoring and control applications. Including transformer-based isolation, ranging, linearization, A/d conversion and RS-232C/RS-485 serial communication for up to 256 channels per serial port, the 6B Series modules and boards are a complete, low-cost interface between computers and analog signals. All 6B Series input/output modules are fully encapsulated and identical in pin-out and size, facilitating their ability to be mixed and matched with all other 6B Series modules on the same backplane. The 6B Series is fully rated over the industrial temperature range of -25oC to +85oC. Each 6B Series module and board is a complete microcontroller-based process monitoring and control system, with all calibration, address and linearizing parameters stored in non-volatile memory. Being microcontroller-based, 6b Series
Designed for industrial applications, the 6B Series modules incorporate transformer-based isolation with surface-mount manufacturing technology - providing increased reliability at low cost. The compact, rugged 6B Series analog modules can be mixed and matched on a 16-channel backplane for high density, remote process monitoring and control. Communications between backplanes, modules and host is in ASCII over an RS-232C link or RS-485 bi-directional serial bus. Circuitry to convert RS-232C to RS485 is built into the 6B backplane. Baud rates are software programmable, with speeds up to 19.2 K Baud. The 6B Series digital subsystem communication is compatible with the overall 6B Series communication protocol. Each digital I/O board can be configured for its address, baud rate and checksum status. Connection to the 16 and 24-channel solid state relay backplanes is by a 50-conductor ribbon cable. This enables interfacing with input and outputs from 4 V to 240 V. Power control modules are also available that can switch up to 3A and come with a variety of ratings for low voltage DC up to 280 VAC.
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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.
6B11 / 6B11HV GENERAL DESCRIPTION
The 6B11 and 6B11HV are single-channel isolated signalconditioning modules which accept the outputs from thermocouple, milli-volt, voltage, and process current signals. Unlike conventional signal conditioners, the 6B11 and 6B11HV are complete microcomputer-based data acquisition systems. A major advantage of the onboard microcontroller is its ability to be remotely reconfigured for various sensor types and input ranges. Synchronized Sampling - The synchronized sampling command allows data to be sampled simultaneously from all 6B11, 6B11HV, 6B12, 6B12HV modules and all 6B50 boards in a 6B Series system. Each module or board stores the data in a separate register within its microcontroller and can access the data with a separate command. Software Configuration - The 6B11 and 6B11HV linearize and compensate J, K, T, E, R, S and B thermocouples. Additionally, these modules also digitize milli-volt and voltage ranges from . +15mV to +5V as well as 0 to +20mA process current inputs. Software is used to configure the 6B11 and 6B11HV modules for address, input range, baud rae, data format, checksum status and integration time. All programmable parameters are stored in the nonvolatile memory of the module. Each analog input signal is conditioned and scaled by a programmable-gain amplifier and digitized by a 16-bit integrating converter under microprocessor control. The digitized value is passed serially across a magnetically isolated barrier (1500 V rms - Model 6B11, 2500 V rms - Model 6B11HV) and clocked in by a custom controller chip. The onboard microprocessor then converts the data into engineering units as determined by the channel parameters. In between conversions, the microprocessor auto zeros the offset and gain by monitoring the on-board temperature and compensating for reference drift. Cold junction compensation (CJC) is also performed at this stage. The 6B11 and 6B11HV use compensation factors to ensure the highest accuracy possible.
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Figure 2
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6B11 / 6B11HV
Models 6B11 and 6B11HV
Range Description (Software Configurable) 15 mV 50 mV 100 mV 500 mV 1 V 5 V 20 mA J Thermocouple, 0C to 760C K Thermocouple, 0C to 1000C T Thermocouple, -100C to +400C E Thermocouple, 0C to +1000C R Thermocouple, +500C to +1750C S Thermocouple, +500C to +1750C B Thermocouple, +500C to +1800C
1
Accuracy1 (Typical) 0.03 % FS 0.015 % FS 0.0055 % FS 0.005 % FS 0.005 % FS 0.005 % FS 0.008 % FS 0.4C 0.5C 0.5C 0.5C 0.63C 0.62C 1.2C
2
Accuracy1 (Maximum) 0.06 % FS 0.04 % FS 0.03 % FS 0.03 % FS 0.03 % FS 0.03 % FS 0.03 % FS 0.75C 0.75C 0.75C 0.75C 1.5C 1.5C 2.0C
2
Noise (Peak-to-Peak) 0.02 % FS 0.01 % FS 0.005 % FS 0.002 % FS 0.005 % FS 0.0015 % FS 0.005 % FS 0.14C 0.22C 0.2C 0.2C 0.3C 0.4C 0.7C
Accuracy is given for 6B11 and 6B11HV module only. When measuring thermocouple signals, the CJC temperature sensor error should be added to the module accuracy to compute the system accuracy. The AC1361 CJC temperature sensor is provided on each channel of the 6B Series backplanes. 2 Does not include the error of the current to voltage input resistor, Model AC1381.
6B11 and 6B11HV Specifications (typical @ +25C and Vs = +5 V dc)
Description Inputs, Software Selectable Thermocouple Types mV Volt Current Range J, K, T, E, R, S, B 15 mV to 500 mV (Refer to Model Table) 1 V; 5 V 20 mA Communications Protocol Baud Rates, Software Selectable RS-485 300K, 600K, 1.2K, 2.4K. 9.6K, 19.2K Accuracy Initial @ +25C Input Offset vs. Temperature Span vs. Temperature Refer to Model Table 0.3 V/C 3 ppm/C (25 ppm/C, maximum) Cold Junction Compensation1 Initial Accuracy @ +25C Accuracy, +5C to +45C 0.25C (0.75C, maximum) 0.5C (0.0125C/C) Model 6B11 and 6B11HV
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6B11 / 6B11HV
Input Resistance Bandwidth, -3 dB Conversion Rate Synchronized Sampling Command Conversion Time 100 M 4 Hz 9 samples /second Yes 70 ms maximum Common-Mode Voltage (CMV) Input-to-Output and Power Model 6B11 Model 6B11HV 1500 V rms, continuous 2500 V rms, continuous Common-Mode Rejection (CMR) 1 k Source Imbalance @ 50/60 Hz 160 dB Normal Mode Rejection (NMR) 1 k Source Imbalance @ 50/60 Hz Input Protection Input Transient Protection 58 dB 240 V rms, continuous ANSI/IEEE C37.90.1-1989 Power Supply Voltage, Operating Voltage, maximum safe limit Current Mechanical Dimensions +5 V dc 5% +6.5 V dc +100 mA 2.3" x 3.1" x 0.79" (58.4 mm x 78.7 mm x 19.1 mm) Environmental Temperature Range Rated Performance Operating Storage Relative Humidity
1
-25C to +85C -25C to +85C -40C to +85C 0 to 95% @ +60C non-condensing
When used with the CJC temperature sensor, model AC1361, provided on each channel of 6B Series backplanes. Specifications subject to change without notice.
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6B11 / 6B11HV PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Figure 3 . Model 6B Series Module, with pin-out assignments.
Table 1. Pin Function Descriptions--
Pin No. 1 2 3 4 Description N/C HI LO N/C
Figure 4 6B11 & 6B11HV Input Field Connections
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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6B11 / 6B11HV OUTLINE DIMENSIONS
Figure 5. Outline Dimensions
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6B11 / 6B11HV NOTES
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6B11 / 6B11HV NOTES
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. D05163-0-9/04(0)
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