AD 6B50-2

Isolated, Field Configurable Digital I/O
6B50-1 / 6B50-2
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.
in a given application and carried in inventory.
Process Monitoring & Control
Test Stand Automation
Machine Monitoring
Material Testing
Remote Energy Mangement
Laboratory Data Acquisition
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
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
Figure 1. 6B50-1 & 6B50-2 Functional Block Diagram
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.
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
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
6B50-1 / 6B50-2
The 6B50-1 and 6B50-2 are 24-channel digital I/O boards
which are compatible with the 6B Series Signal-Conditioning
Modules at the network level. Each converts commands from
the host computer into logic levels suitable for interfacing with
industry-standard opto-isolated digital I/O panels. All I/O
channels can be configured for input or output, using bit or byte
addressing. In addition, the status of the port can be read back
by the host to confirm the I/O configuration
software-configured for address, baud rate, data format,
checksum status and I/O configuration. All programmable
parameters are stored in the nonvolatile memory of each digital
I/O board.
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.
An included EEPROM stores system parameters (address, baud
rate, checksum, etc.) as well as I/O configuration information.
The microcontroller is interfaced to 8-bit latches and buffers a
maximum of 24 digital i/o channels. Each channel can be
individually set as either an input or output. The 6B50-1 and
6B50-2 are 3.47-inch x 6.5-inch open boards that can be panel
or rack mounted.
An on-board microcontroller communicates with the host
through an RS-232C port (Model 6B50-2 or with a 6B Series
backplane through an RS 485 port (Model 6B50-1) to exchange
command and status information.
Software Configuration – The 6B50-1 and 6B50-2 can be
Figure 2
Rev. 0 | Page 2 of 8
6B50-1 / 6B50-2
6B50-1 AND 6B50-2 Models Available
Host PC
Expansion & Module
Digital I/O
(Software Configurable)
24 Channels
24 Channels
6B50-1 and 6B50-2 Specifications
(typical @ +23°C ±5°C and Vs = +24 V dc)
Model 6B50-1 and 6B50-2
Digital I/O
Number of I/O Channels
24 (Software Configurable for Input or Output)
I/O Circuit Configuration
Open Collector Outputs with 47 kΩ Pullups to +5 V
Digital Inputs
High-Level Input
+3.5 V minimum; +5.25 V maximum
Low Level Output
0.8 V maximum
Digital Outputs
High Level Output Current
50 µA @ +5 V
Low Level Output Current
100 mA @ +1.1 V
High-Level Output Voltage
+5.25 V maximum
Male, 50-Pin
Model 6B50-2
Baud Rates, Software Selectable
300K, 600K, 1.2K, 2.4K, 4.8K, 9.6K,19.2K
Distance From Host PC and 6B50-2
50 feet maximum
Male, DB-25
LED Indicators
Data and Enable
Synchronized Sampling Command
Conversion Time
1 ms maximum
Model 6B50-1
Baud Rates, Software Selectable
300K, 600K, 1.2K, 2.4K, 4.8K, 9.6K, 19.2K
Distance From 6B Backplane and 6B50-1
4000 feet maximum
6 Screw Terminals
LED Indicators
Data and Enable
Synchronized Sampling Command
Conversion Time
1 ms maximum
Rev. 0 | Page 3 of 8
6B50-1 / 6B50-2
Power Supply
Voltage, Operating
+5 V dc ±5%
Voltage, maximum safe limit
+6.5 V dc
+70 mA1
1.5 amp Slow-blow, Littelfuse™ Type 251.01.5
Mechanical Dimensions
3.47" x 6.5"
(90.68 mm x 165.1 mm)
Temperature Range
Rated Performance
0°C to +70°C
0°C to +70°C
-40°C to +85°C
Relative Humidity
0 to 95% @ +60°C, non-condensing
Excluding load current.
Specifications subject to change without notice.
Rev. 0 | Page 4 of 8
6B50-1 / 6B50-2
Figure 3 . Model 6B50 Series Connector, with pin-out assignment.
Figure 4 6B50-1 & 6B50-2 Input Field Connections
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.
Rev. 0 | Page 5 of 8
6B50-1 / 6B50-2
Figure 5. Outline Dimensions
Rev. 0 | Page 6 of 8
6B50-1 / 6B50-2
Rev. 0 | Page 7 of 8
6B50-1 / 6B50-2
© 2004 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective companies.
Rev. 0 | Page 8 of 8