Rockwell Automation 1747-SN User Manual
Remote I/O Scanner
1747-SN
User Manual
Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application,
Installation and Maintenance of Solid State Controls (Publication SGI-1.1
available from your local Rockwell Automation sales office or online at
http://www.ab.com/manuals/gi) describes some important differences
between solid state equipment and hard-wired electromechanical devices.
Because of this difference, and also because of the wide variety of uses for
solid state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is
acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for
indirect or consequential damages resulting from the use or application of
this equipment.
The examples and diagrams in this manual are included solely for illustrative
purposes. Because of the many variables and requirements associated with
any particular installation, Rockwell Automation, Inc. cannot assume
responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to
use of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without
written permission of Rockwell Automation, Inc. is prohibited.
Throughout this manual, when necessary we use notes to make you aware of
safety considerations.
WARNING
IMPORTANT
ATTENTION
SHOCK HAZARD
BURN HAZARD
Identifies information about practices or circumstances
that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property
damage, or economic loss.
Identifies information that is critical for successful
application and understanding of the product.
Identifies information about practices or circumstances
that can lead to personal injury or death, property
damage, or economic loss. Attentions help you:
• identify a hazard
• avoid a hazard
• recognize the consequence
Labels may be located on or inside the equipment (e.g.,
drive or motor) to alert people that dangerous voltage may
be present.
Labels may be located on or inside the equipment (e.g.,
drive or motor) to alert people that surfaces may be
dangerous temperatures.
Summary of Changes
The information below summarizes the changes to this manual since
the last printing. Updates to the manual include using RSLogix 500
instead of APS software.
To help you find new and updated information in this release of the
manual, we have included change bars as shown to the right of this
paragraph.
The table below lists the sections that document new features and
additional or updated information on existing features.
For this information: See
configuring RIO using G Files page 4-4
using block transfer instruction (BTR and
BTW)
removed Chapter 7 application examples can be found in
configuring G files using RSLogix 500 page B-9
block transfer examples for earlier
processors
page 5-5
Chapter 4 and Chapter 5
Appendix D
1 Publication 1747-UM013B-EN-P - January 2005
Summary of Changes 2
Publication 1747-UM013B-EN-P - January 2005
Important User Information . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Table of Contents Chapter 1
Overview
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Scanner I/O Image Division . . . . . . . . . . . . . . . . . . . . . 1-3
How the Scanner Scans Remote I/O . . . . . . . . . . . . . . . . . 1-4
SLC and Scanner Asynchronous Operation . . . . . . . . . . 1-4
How the Scanner Interacts with Adapters . . . . . . . . . . . . . . 1-5
Scanner I/O Image Concepts . . . . . . . . . . . . . . . . . . . . . . . 1-6
Example Scanner I/O Image. . . . . . . . . . . . . . . . . . . . . 1-7
Transferring Data with RIO Discrete and Block Transfers 1-9
Physical and Logical RIO Link Specifications . . . . . . . . . 1-9
Extended Node Capability . . . . . . . . . . . . . . . . . . . . . . 1-9
Complementary I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
Complementary I/O: Placing Modules with 2-Slot Addressing
1-12
Complementary I/O: Placing Modules with 1-Slot Addressing
1-13
Complementary I/O: Placing Modules with 1/2-Slot
Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Summary for Placing Modules Used In Complementary I/O.
1-15
Complementary I/O Application Considerations . . . . . . 1-17
Complementary 1771 I/O Module Details . . . . . . . . . . . 1-17
Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
Baud Rate DIP Switch . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
RIO Link Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Compatible Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
Table of Contents
Chapter 2
Quick Start for Experienced Users
Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . 2-1
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Chapter 3
Installation and Wiring
1 Publication 1747-UM013B-EN-P - January 2005
Compliance to European Union Directives . . . . . . . . . . . . . 3-1
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Baud Rate Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Scanner Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Insertion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
RIO Link Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
New Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
For Series A Scanner Retrofits . . . . . . . . . . . . . . . . . . . . 3-7
Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Scanner Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
At Power Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
In Run Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Table of Contents 2
Scanner Configuration and
Programming
When Changing From Run Mode . . . . . . . . . . . . . . . . . 3-8
Status LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Chapter 4
Understanding Remote Input and Output Image Files. . . . . 4-1
RIO Configuration Using G Files . . . . . . . . . . . . . . . . . . . . 4-4
Rules for Configuring the Scanner. . . . . . . . . . . . . . . . . 4-7
Considerations When Configuring Remote I/O . . . . . . . . . . 4-12
G File Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Crossing Logical Rack Boundaries . . . . . . . . . . . . . . . . 4-13
Understanding M Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
M Files Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
M0 Control File Description . . . . . . . . . . . . . . . . . . . . . 4-16
M0 File - RIO Device Inhibit Control. . . . . . . . . . . . . . . 4-17
M0 File - RIO Device Reset Control. . . . . . . . . . . . . . . . 4-18
M0 File - Remote Output Reset Control. . . . . . . . . . . . . 4-19
Device Reset and Remote Output Reset Considerations. . . . 4-21
M1 Status File Description . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
General Communication Status - Enable Device Fault Bit. . .
4-23
General Communication Status - Communication Attempted
Bit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
RIO Baud Rate Status . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Logical Device Starting Address Status . . . . . . . . . . . . . 4-24
Logical Device Image Size Status . . . . . . . . . . . . . . . . . 4-25
Active Device Status. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Logical Device Fault Status . . . . . . . . . . . . . . . . . . . . . . 4-27
RIO Status Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
RIO Communication Retry Counter (M1:e.16 -47) . . . . . . . . 4-30
Understanding Slot Addressing . . . . . . . . . . . . . . . . . . . . . 4-32
SLC/Scanner Configuration . . . . . . . . . . . . . . . . . . . . . . . . 4-33
RIO Block Transfer
Troubleshooting
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Chapter 5
RIO Block Transfer Theory of Operation . . . . . . . . . . . . . . 5-1
What Is RIO Block Transfer? . . . . . . . . . . . . . . . . . . . . 5-1
Using Block Transfer Instructions (BTR and BTW) . . . . . . . 5-5
RIO Block Transfer General Functional Overview . . . . . 5-5
Parameters for BTR and BTW. . . . . . . . . . . . . . . . . . . . 5-6
Control Status Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Instruction Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 5-11
Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . 5-12
Comparison to the PLC-5 BTR and BTW . . . . . . . . . . . . 5-16
Chapter 6
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Specifications
M0 - M1 Files and G Files
Table of Contents 3
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Retry Counters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Block Transfers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Appendix A
Scanner Operating Specifications . . . . . . . . . . . . . . . . . . . . A-1
Network Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Throughput Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . A-2
RIO Network Throughput Components. . . . . . . . . . . . . A-2
Calculating Throughput. . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Discrete I/O Throughput without Block Transfers (Tdm-nbt)
Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3
Discrete I/O Throughput with Block Transfers (Tdm-bt)
Present . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Block Transfer Throughput . . . . . . . . . . . . . . . . . . . . A-10
RIO Scanner Output Delay Time (TSNo) Tables . . . . . A-13
Appendix B
M0 - M1 Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Addressing M0-M1 Files . . . . . . . . . . . . . . . . . . . . . . . . B-2
Restrictions on Using M0-M1 Data File Addresses . . . . . B-2
Monitoring Bit Addresses . . . . . . . . . . . . . . . . . . . . . . . B-2
Transferring Data Between Processor Files and M0 or M1 Files
B-4
Access Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Minimizing the Scan Time . . . . . . . . . . . . . . . . . . . . . . B-7
Capturing M0-M1 File Data. . . . . . . . . . . . . . . . . . . . . . B-8
Specialty I/O Modules with Retentive Memory . . . . . . . B-8
G Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-9
Configuring G Files using RSLogix 500 . . . . . . . . . . . . . B-9
After all devices have been properly mapped, click OK and
the G file is automatically configured. This procedure
eliminates the bit by bit process needed to configure the G
file with other programming tools. . . . . . . . . . . . . . . . B-13
Editing G File Data . . . . . . . . . . . . . . . . . . . . . . . . . . B-14
RIO Configuration Worksheet
Block Transfer Examples for
Earlier Processors
Appendix C
Directions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
Appendix D
BTR and BTW Control Logic Examples . . . . . . . . . . . . . . . D-1
Block Transfer Read Control Logic Example . . . . . . . . . D-1
Block Transfer Write Control Logic Example . . . . . . . . D-4
Directional Continuous Block Transfer Example . . . . . . D-6
Directional Repeating Block Transfer Example . . . . . . . D-9
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Table of Contents 4
Glossary
Index
Directional Non-Continuous Block Transfer Example . D-12
Bidirectional Continuous Block Transfer Example . . . . D-16
Bidirectional Alternating Block Transfer . . . . . . . . . . . D-21
Bidirectional Alternating Repeating Block Transfer . . . D-27
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . 1-7
Installation Assistance . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
New Product Satisfaction Return. . . . . . . . . . . . . . . . . . 1-7
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Overview
This chapter contains the following information:
• system overview
• how the scanner interacts with the SLC processor
• how the scanner interacts with adapter modules
• scanner I/O image concepts
• extended node capability
• complementary I/O
• scanner features
• compatible network devices
Chapter
1
System Overview
The Remote I/O (RIO) Scanner, Catalog Number 1747-SN, is the
remote I/O scanner for the SLC 500. It enables communication
between an SLC processor (SLC 5/02 or later) and remotely located
(3,048 meters [10,000 feet] maximum) 1746 I/O chassis and other RIO
compatible Allen-Bradley operator interface and control devices. The
1747-SN Scanner communicates with remotely located devices using
the Allen-Bradley Remote I/O link. The RIO link consists of a single
master (scanner) and multiple slaves (adapters). Communication
between devices occurs over twisted pair cable with the devices
daisy-chained together. The scanner can reside in any slot of the local
SLC chassis except for slot 0.
The Remote I/O (RIO) Scanner, Catalog Number 1747-SN, is the
remote I/O scanner for the SLC 500. It enables communication
between an SLC processor (SLC 5/02 or later) and remotely located
(3,048 meters [10,000 feet] maximum) 1746 I/O chassis and other RIO
compatible Allen-Bradley operator interface and control devices. The
1747-SN Scanner communicates with remotely located devices using
the Allen-Bradley Remote I/O link. The RIO link consists of a single
master (scanner) and multiple slaves (adapters). Communication
between devices occurs over twisted pair cable with the devices
daisy-chained together. The scanner can reside in any slot of the local
SLC chassis except for slot 0.
1 Publication 1747-UM013B-EN-P - January 2005
1-2 Overview
SLC 5/02
or Later
Processor
Local SLC Chassis
Dataliner Message Display
(Adapter/Slave)
RIO Scanner
(Master of the
RIO Link)
The scanner transfers input and
output data between itself and all
configured network devices over
twisted pair cable. Note that the
end-to-end length of the cable can be
a maximum of 3,048 meters (10,000
feet).
PanelView Operator Terminal
(Adapter/Slave)
The scanner can be configured for and transfer a maximum of 4
logical racks of discrete data on the RIO link. The scanner provides
discrete I/O and block (Series B or later) transfers. Configurations
allowed are any combination of quarter, half, three-quarter, or full
logical rack devices.
1747-ASB Module
(Adapter/Slave)
Remote Chassis
Remote Expansion Chassis
RediPANEL
(Adapter/Slave)
SLC 5/02
or Later
Processor
Adapter 1
Half Logical
Rack
Device
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RIO
Scanner
Adapter 2
Quarter Logical
Rack
Device
The scanner transfers discrete input and output data
between itself, remote adapters, and the SLC processor..
Remote adapters consist of 1746 chassis and other
Allen-Bradley operator interface and control devices.
Adapter 3 Adapter 4
Half
Logical Rack
Device
Three-Quarter
Logical Rack
Device
Adapter 5
Full
Logical Rack
Device
Adapter 6
Full
Logical Rack
Device
The SLC processor transfers the scanner’s 4 logical racks (32 input
image and 32 output image words) of discrete remote I/O image data
into the SLC input and output image files. You can adjust the size of
the scanner input and output image file during configuration of your
SLC system so that the scanner only transfers the discrete I/O data
Overview 1-3
your application program requires. Configuration is done through the
confiGuration file (G file). Refer to Chapter 4, Configuration and
Programming, for more information.
IMPORTANT
The SLC 500 processor (SLC 5/02 or later) supports
multiple scanners in its local I/O chassis. The
maximum number is dependent on the following:
• backplane power requirements (power supply
dependent)
• SLC 500 processor I/O data table limit (4,096 I/O)
• processor memory to support the application
(SLC 500 processor dependent)
Scanner I/O Image Division
The scanner allows each adapter to use a fixed amount (user defined)
of the scanner’s input and output image. Part of the SLC processor’s
image is used by local I/O, the other portion is used by the scanner
for remote I/O.
The scanner remote I/O image is divided into logical racks and further
divided into logical groups. A full logical rack consists of eight input
and eight output image words. A logical group consists of one input
and one output word in a logical rack. Each logical group is assigned
a number from 0 to 7.
Local I/O
Logical Rack 0
Remote I/O
(Scanner Image)
Processor I/O Image Scanner I/O Image Adapter
Logical Rack 1
Logical Group 0
Logical Rack 2
Logical Group 7
Image
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1-4 Overview
The scanner image contains the image of each adapter on the RIO
link. The adapter is assigned a portion of the scanner image, which is
referred to as the adapter image.
How the Scanner Scans Remote I/O
The scanner communicates with each logical device in a sequential
fashion. First, the scanner initiates communication with a device by
sending output data to the device. The device then responds by
sending its input data back to the scanner, as illustrated below. You
refer to this exchange as a discrete I/O transfer. After the scanner
completes its discrete I/O transfer with the last configured network
device, it begins another discrete I/O transfer with the first device.
It is important to understand that the scanner transfers RIO data on a
logical device basis not on an adapter basis. A logical device is a full
logical rack or portion of a logical rack assigned to an adapter.
RIO Scanner Scan
The scanner updates its
input image file each time
it scans a logical device.
Scanner
Input
Image File
Input
Device 3
Output
Device 3
Output
Device 2
Input
Device 1
Output
Device 1
Input
Device 2
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Scanner Output
Image File
SLC and Scanner Asynchronous Operation
The SLC processor scan and RIO scanner scan are independent
(asynchronous) of each other. The SLC processor reads the scanner
input image file during its input scan and writes the output image file
to the scanner during its output scan. The RIO scanner continues
reading inputs and writing outputs to the scanner I/O image file,
independent of the SLC processor scan cycle.
Depending on your SLC processor, RIO link configuration, and
application program size, the scanner may complete multiple scans
before the SLC processor reads the scanner’s input image file. The RIO
scanner updates its I/O files on a per logical rack basis.
The figure below illustrates the asynchronous operation of the SLC
t
processor and RIO scanner.
SLC Processor Scan Cycle RIO Scanner Scan Cycle
Overview 1-5
The SLC processor reads the
scanner input image file into the
SLC input image file, processes
it, and creates an SLC output
image file. The SLC processor
ransfers its output file to the
scanner..
Important: The outputs of the RIO are updated after the end of the first SLC processor scan.
Program
SLC Processor
How the Scanner Interacts with Adapters
Input
Image
Device 1
Input
Image
Device 2
Output
Image
Device 1
The scanner updates its
input image file each time
it scans a logical device.
The scanner may scan all
of its configured logical
devices several times
before the SLC processor
reads the scanner's input
image file.
SLC Input
Image File
SLC Output
Image File
Scanner
Input
Image File
Input
Image
Device 3
Output
Image
Device 2
Scanner Output
Image File
Output
Image
Device 3
The scanner’s function is to continuously scan the adapters on the RIO
link in a consecutive manner. This scan consists of one or more RIO
discrete transfers to each adapter on the RIO link.
RIO discrete transfers consist of the scanner sending output image
data and communication commands to the adapter that instruct the
adapter on how to control its output. (These include run, adapter
reset, and reset decide commands.) The adapter responds by sending
input data to the scanner. The scanner performs as many RIO discrete
transfers as necessary to update the entire adapter image. If RIO
discrete transfers do not occur, data is not exchanged between the
scanner and adapter. RIO discrete transfers are asynchronous to the
processor scan.
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1-6 Overview
SLC Local Chassis
Processor
Scanner
RIO Discrete
Transfers
with Adapter 1
RIO Discrete
Transfers
with Adapter 2
RIO Discrete
Transfers
with Adapter 3
RIO Discrete
Transfers
with Adapter 4
PanelView Operator
Terminal
RediPANEL
Scanner I/O Image Concepts
The scanner’s I/O image consists of RIO logical racks and I/O groups.
A full RIO logical rack consists of eight input image and eight output
image words. (A word consists of 16 bits of data.) Each word within
an RIO logical rack is assigned an I/O group number from 0 to 7.
You assign devices on the RIO link a portion of the scanner’s image.
Devices can occupy a quarter logical rack (2 input and output words),
half logical rack (4 I/O words), three-quarter logical rack (6 I/O
words), or full logical rack. You may configure devices to start at any
even I/O group number within an RIO logical rack. More than one
physical device’s (adapter) I/O information can reside in a single
logical rack. Also, by crossing logical rack boundaries, a device can
consist of more than one logical rack.
IMPORTANT
The following illustration shows only the input
image configuration of the scanner’s I/O image. The
output image configuration is the same.
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Input Image Half of a Scanner's I/O Image
Overview 1-7
RIO
Logical
Rack 0
RIO
Logical
Rack 1
RIO
Logical
Rack 2
RIO
Logical
Rack 3
Bit Number (decimal)
Rack 0 Group 0
Rack 0 Group 1
Rack 0 Group 2
Rack 0 Group 3
Rack 0 Group 4
Rack 0 Group 5
Rack 0 Group 6
Rack 0 Group 7
Rack 1 Group 0
Rack 1 Group 1
Rack 1 Group 2
Rack 1 Group 3
Rack 1 Group 4
Rack 1 Group 5
Rack 1 Group 6
Rack 1 Group 7
Rack 2 Group 0
Rack 2 Group 1
Rack 2 Group 2
Rack 2 Group 3
Rack 2 Group 4
Rack 2 Group 5
Rack 2 Group 6
Rack 2 Group 7
Rack 3 Group 0
Rack 3 Group 1
Rack 3 Group 2
Rack 3 Group 3
Rack 3 Group 4
Rack 3 Group 5
Rack 3 Group 6
Rack 3 Group 7
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Word 8
Word 9
Word 10
Word 11
Word 12
Word 13
Word 14
Word 15
Word 16
Word 17
Word 18
Word 19
Word 20
Word 21
Word 22
Word 23
Word 24
Word 25
Word 26
Word 27
Word 28
Word 29
Word 30
Word 31
Bit Number (octal)
0123456789101112131415
Quarter Logical
Rack
Not Used In This
Example
Half Logical
Rack
Not Used In This
Example
Three-Quarter
Logical Rack
Not Used In This
Example
Full
Logical
Rack
0
1828384858687
8108118128138148158168178
8
Example Scanner I/O Image
The illustrations below show a scanner’s input image of 4 RIO link
devices.
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1-8 Overview
SLC 5/02
or Later
Processor
RIO
Scanner
RIO
Logical
Rack 0
RIO
Logical
Rack 1
RIO
Logical
Rack 2
RIO
Logical
Rack 3
Device 1
Full Logical Rack
Device
Begins at Logical
Rack 0, Group 0.
Important: The illustration below shows only the scanner's input image. The output image looks the same.
Bit Number
Rack 0 Group 0
Rack 0 Group 1
Rack 0 Group 2
Rack 0 Group 3
Rack 0 Group 4
Rack 0 Group 5
Rack 0 Group 6
Rack 0 Group 7
Rack 1 Group 0
Rack 1 Group 1
Rack 1 Group 2
Rack 1 Group 3
Rack 1 Group 4
Rack 1 Group 5
Rack 1 Group 6
Rack 1 Group 7
Rack 2 Group 0
Rack 2 Group 1
Rack 2 Group 2
Rack 2 Group 3
Rack 2 Group 4
Rack 2 Group 5
Rack 2 Group 6
Rack 2 Group 7
Rack 3 Group 0
Rack 3 Group 1
Rack 3 Group 2
Rack 3 Group 3
Rack 3 Group 4
Rack 3 Group 5
Rack 3 Group 6
Rack 3 Group 7
Bit Number (octal)
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Word 8
Word 9
Word 10
Word 11
Word 12
Word 13
Word 14
Word 15
Word 16
Word 17
Word 18
Word 19
Word 20
Word 21
Word 22
Word 23
Word 24
Word 25
Word 26
Word 27
Word 28
Word 29
Word 30
Word 31
Device 2
Three-Quarter Logical
Rack Device
Begins at Logical
Rack 1, Group 0.
Device 3 Device 4
Half Logical Rack
Device
Begins at Logical
Rack 2, Group 0.
8108118128138148158168178
e = slot number of the SLC chassis containing the scanner
Quarter Logical Rack
Device
Begins at Logical
Rack 2, Group 4.
Input File
0123456789101112131415
Address
I:e.0
I:e.1
I:e.2
I:e.3
I:e.4
I:e.5
I:e.6
I:e.7
I:e.8
I:e.9
I:e.10
I:e.11
I:e.12
I:e.13
I:e.14
I:e.15
I:e.16
I:e.17
I:e.18
I:e.19
I:e.20
I:e.21
I:e.22
I:e.23
I:e.24
I:e.25
I:e.26
I:e.27
I:e.28
I:e.29
I:e.30
I:e.31
0
1828384858687
8
Device 1
Device 2
Not Used
Device 3
Device 4
Not Used
Publication 1747-UM013B-EN-P - January 2005
Overview 1-9
Transferring Data with RIO Discrete and Block Transfers
Input and output image data and command information are quickly
exchanged between a scanner and adapter using RIO discrete
transfers. RIO discrete transfers are the simplest and fastest way a
scanner and adapter communicate with each other. RIO discrete
transfers, which are transparent to the user, consist of the scanner
sending the output image data to the adapter, and the adapter
transmitting input data to the scanner. Each RIO discrete transfer also
contains scanner commands for the adapter.
Through your control program, you command the SLC processor to
initiate RIO block transfers, which directs the scanner to exchange
large amounts of data to/from an adapter. Block Transfers (BTs) use
the basic RIO discrete transfer mechanism of the RIO link. However,
the actual transfer of data occurs asynchronous to the discrete
transfers. It is possible for several discrete transfers to occur before the
scanner processes a block transfer. Refer to Chapter 5, RIO Block
Transfer for more details.
Physical and Logical RIO Link Specifications
The maximum number of adapters with which your scanner can
communicate is determined by the scanner’s and adapter’s physical
and logical specifications, as described below:
• Physical Specifications are the maximum number of adapters
that can be connected to the scanner. For more information, see
Extended Node Capability below.
• Logical Specifications for the scanner are the maximum number
of logical racks the scanner can address, how the logical racks
can be assigned, and whether the scanner can perform BTs.
Extended Node Capability
Extended node functionality allows you to connect up to 32 physical
devices on an RIO link. You must use 82 Ohm RIO link resistors in an
extended node configuration. You can only use extended node if all
RIO link devices have extended node capability. (Refer to the
Compatible Devices table at the end of this chapter, or to the
specifications of your device.) The 1747-SN Series B Scanner has
extended node capability. However, the smallest logical rack division
is 1/4 logical rack and the scanner image size is 4 logical racks.
Therefore, the scanner is limited to 16 devices unless complementary
Publication 1747-UM013B-EN-P - January 2005
1-10 Overview
I/O is used. Refer to the following section for more information on
complementary I/O.
Complementary I/O
Complementary I/O is very useful when portions of your input and
output images are unused because it allows the images of two
adapters to overlap each other in the scanner’s I/O image. To use
complementary I/O, the I/O image from one adapter must be the
mirror (complement) of the other. This means that there must be an
input module in the primary chassis and an output module in the
same slot of the complementary chassis. This enables total use of the
scanner’s 32 input and 32 output word image for I/O addressing of up
to 1024 discrete points.
ATTENTION
Because the primary and complementary chassis
images overlap, input and specialty combination I/O
modules must never share the same image location.
Inputs received by the scanner may be incorrect and
RIO block transfers will not be serviced properly.
If an output module shares its output image with
another output module, both output modules receive
the same output information.
If you want to use complementary I/O, two adapters that support this
function are required (e.g., 1747-ASB modules). One adapter is
configured (via its DIP switches) as a primary chassis, the other as a
complementary chassis. If a primary chassis exists, it is scanned first.
Primary and complementary chassis cannot have the same logical rack
number. The logical rack numbers must be assigned to the primary
and complementary racks as shown below:
Primary Chassis Logical
Rack Number
Complementary Chassis Logical Rack Number
Decimal Octal
Publication 1747-UM013B-EN-P - January 2005
0810
1911
21012
31113
Overview 1-11
ATTENTION
If the logical rack numbers are not properly
assigned, unpredictable operation of both ASB
modules results. No ASB module errors occur. Refer
to your ASB module user manual for specific
information on setting the address of the
complementary chassis. (For example, in the
1771-ASB manual the addresses for the
complementary chassis are referred to as
complementary chassis 0-3.)
Guidelines for Configuring Complementary I/O
When you configure your remote system for complementary I/O,
follow these guidelines:
• You can place an output module in the primary chassis opposite
another output module in the complementary chassis; they use
the same bits in the output image table. However, we do not
recommend this placement of modules for redundant I/O.
• You cannot use complementary I/O with a chassis that uses
32-point I/O modules and 1-slot addressing or 16-point I/O
modules with 2-slot addressing.
• Do not place an input module in the primary chassis opposite
an input module in the complementary chassis; they will use the
same bits in the input image table.
Publication 1747-UM013B-EN-P - January 2005
1-12 Overview
Example 1
Complementary I/O: Placing Modules with 2-Slot Addressing
The following figures illustrate a possible module placement to
configure complementary I/O using 2-slot addressing.
Example 2
I
8
012345
O
8
I
16
012345
I
8
O
8
O
16
O
8
I
8I 8
I
16
O
8
O
16
I
16
E
M
P
T
Y
I
16
O
16O 8O 8
11
E
M
O
P
8O 8
T
Y
O
16
12
I
16
1
O
16
BT
E
M
P
T
Y
I
16
O
8
I
8
O
8
O
16
O
BT
8
E
E
M
M
P
P
T
T
Y
I
16
Y
2
O
16
2
2
Publication 1747-UM013B-EN-P - January 2005
Outputs in the complementary chassis would use the same bits in the
output image table as the outputs in the primary chassis. You cannot
place inputs in the complementary chassis.
1 = Output modules use the same output image table bits. This is not recommended.
2 = Must be empty if corresponding primary slot is a block transfer module.
Important: With 2-slot addressing, if an input module resides in either slot associated with a
logical group of the primary chassis, an input module cannot reside in that logical group' s
complementary chassis.
Example 1
Overview 1-13
Complementary I/O: Placing Modules with 1-Slot Addressing
The figure below illustrates a possible module placement to configure
complementary I/O using 1-slot addressing.
Example 2
I
I
16
01234 5
O
16O 16I 16I 16
I
16
01234 5
O
16
16O16
I
I
16
16I 16I 16I 16I 16I 16I 16I 16I 16
O
16
I
16
O
16
I
16
O
BT I
16
1
67 0 1 2 3
O
16
1
67 0 1 2 3
16O 16O 16
E
M
P
O
T
16
Y
2
I
16
I
16
I
16O 16
I
16
O
16O 16
I = Input Module (8- or 16-point) O = Output Module (8- or 16-point)
BT = Block Transfer Module
1 = Output modules use the same output image table bits. This is not recommended.
2 = Must be empty if corresponding primary slot is block transfer..
O
16O 16O 16O 16O 16O 16O 16O 16O 16O 16
Publication 1747-UM013B-EN-P - January 2005
1-14 Overview
Example 1
Complementary I/O: Placing Modules with 1/2-Slot Addressing
The figure below illustrates a possible module placement to configure
complementary I/O using 1-slot addressing.
IIOOO O BT I
I
1
O
Example 2
01 23 45 67 01 23
OOII IOO1I
I I
01 23 45 67 01 23 45 67 01 23
OO
IIIIIIII
OOO OOO OO
45 67 01 23
E
M
P
T
Y
2
O
Publication 1747-UM013B-EN-P - January 2005
I = Input Module (8-, 16-, or 32-point) O = Output Module (8-, 16-, or 32-point)
BT = Block Transfer Module
1 = Output modules use the same output image table bits. This is not recommended.
2 = Must be empty if corresponding primary slot is block transfer.
Overview 1-15
Summary for Placing Modules Used In Complementary I/O
Discrete Modules
Addressing Method Types of Modules used Placement
2-slot 8-point Install input modules
opposite output modules,
and output modules
opposite input modules.
1-slot 8-point, 16-point
1/2-slot 8-point, 16-point, 32-point
(1) If an input module resides in either slot associated with a logical group of the primary chassis, an input module
cannot reside in that logical group’s complementary chassis.
Block Transfer Modules
(1)
Addressing Method Placement
2-slot The right slot of the primary I/O group can be another block
transfer module, or an 8-point input or output module.
The left slot of the complementary I/O group must be empty.
In the right slot of the complementary I/O group, you can place
an 8-point output module; this slot must be empty if the
corresponding slot in the primary I/O group is a block transfer
module.
1-slot Leave the corresponding I/O group in the complementary
chassis empty.
1/2-slot Leave the corresponding I/O group in the complementary
chassis empty.
The following example illustrates how I/O modules requiring two
words of the input or output image can leave unused image space.
Publication 1747-UM013B-EN-P - January 2005
1-16 Overview
OOOO
IIII
012 3 45 678
Slot Slot
Slot Pair
1234
I = Input Module
O
= Output Module
Primary Chassis
Primary Chassis Configured As:
Logical Rack Number 0
Logical Group Number 0
Image Size (logical groups) 16
Addressing Mode 1/2-slot
Primary/Complementary Primary
Primary Chassis I/O Image Complementary Chassis I/O Image
Input Image
from Primary Chassis
701017
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
07815
1
2
3
4
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
Octal
Decimal
Slot Pair
Output Image
from Primary Chassis
701017
Decimal
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
07815
1
2
3
4
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
Input Image
Octal
Slot Pair Slot Pair Slot Pair
from Complementary Chassis
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
= unused image space
OOOO
IIII
012 3 45 678
Slot Pair
1234
Complementary Chassis
Complementary Chassis Configured As:
Logical Rack Number 8 (decimal)
Logical Group Number 0
Image Size (logical groups) 16
Addressing Mode 1/2-slot
Primary/Complementary Complementary
701017
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
Decimal
07815
1
2
3
4
from Complementary Chassis
Octal
Output Image
701017
Slot 1
Slot 1
Slot 1
Slot 1
Slot 2
Slot 2
Slot 2
Slot 2
Slot 3
Slot 3
Slot 3
Slot 3
Slot 4
Slot 4
Slot 4
Slot 4
Slot 5
Slot 5
Slot 5
Slot 5
Slot 6
Slot 6
Slot 6
Slot 6
Slot 7
Slot 7
Slot 7
Slot 7
Slot 8
Slot 8
Slot 8
Slot 8
Octal
Decimal
07815
1
2
3
4
Scanner's I/O Image
Both images are overlapped in the
scanner. The overlapped image
appears where the primary chassis
image is configured to reside.
In this case, the primary chassis
image is configured as starting
logical rack 0 and starting logical
group 0.
Publication 1747-UM013B-EN-P - January 2005
Logical
Rack 0
Logical
Rack 1
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Group 0
Group 1
Group 2
Group 3
Group 4
Group 5
Group 6
Group 7
Input Image Output Image
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
701017
Octal
Decimal
07815
Slot 1
Slot 1
1
Slot 2
Slot 2
Slot 3
Slot 3
2
Slot 4
Slot 4
Slot Pair Slot Pair
Slot 5
Slot 5
3
Slot 6
Slot 6
Slot 7
Slot 7
4
Slot 8
Slot 8
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
701017
Slot 1
Slot 1
Slot 2
Slot 2
Slot 3
Slot 3
Slot 4
Slot 4
Slot 5
Slot 5
Slot 6
Slot 6
Slot 7
Slot 7
Slot 8
Slot 8
Octal
Decimal
07815
1
2
3
4
Logical
g
a
g
t
e
Rack 0
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
Overview 1-17
Complementary I/O Application Considerations
If you configure a complementary device to use more I/O image
space than an associated primary device, then block transfers can only
be performed to locations in the complementary device that have
associated I/O image space in the primary device. For example, if a
primary device is 1/2 logical rack and a complementary device is a full
logical rack, block transfers can be performed only in the first 1/2
logical rack of the complementary device. Attempting block transfers
in the last half of the complementary device will result in a BT error
(error - 11 - device not configured).
1/2 logical rack
1/2 logical rack
configured and
usable
1/2 logical rack not
configured
Logical
Rack 8
Word 0
Word 1
Word 2
Word 3
Word 4
Word 5
Word 6
Word 7
1/2 logical rack
ured and us
confi
configured and usable
1/2 logical rack
1/2 logical rack
confi
ured, but no
usable for BT sinc
configured, but not
Words 4-7 are not
usable for BT since
configured for the
Words 4 to 7 are not
primary device.
configured for the
primary device.
Complementary 1771 I/O Module Details
Use the following modules in either primary or complementary I/O
chassis opposite any type of module:
• Communication Adapter Module (1771-KA2)
• Communication Controller Module (1771-KE)
• PLC-2 Family/RS-232-C Interface Module (1771-KG)
• Fiber Optics Converter Module (1771-AF)
• DH/DH+ Communication Adapter Module (1785-KA)
• DH+/RS-232C Communications Interface Module (1785-KE)
Use the following modules in either primary or complementary I/O
chassis opposite any type of module. However, these modules do not
work as stand-alone modules; each one has an associated master
module. Use care when placing the master modules in the I/O chassis:
• Analog Input Expander Module (1771-E1, -E2, -E3)
• Analog Output Expander Module (1771-E4)
• Servo (Encoder Feedback) Expander Module (1771-ES)
• Pulse Output Expander Module (1771-OJ)
Publication 1747-UM013B-EN-P - January 2005
1-18 Overview
Hardware Features
Below are the scanner’s features. You can find LED information in
Chapter 6, Troubleshooting.
2
SCANNER
COMM FAULT
SW1
O
12
N
/
1 2 KBAUD
ON
ONON57.6
OFF
115.2
OFF
ON
230.4
OFF OFF
230.4
CONNECT ONE END OF
CABLE SHIELD TO CHASSIS
MOUNTING BOLT. REFER T O
USER'S MANUAL.
LINE 1
SHIELD
LINE 2
1747±SN
1
CAT
SERIAL NO.
Remote I/O Scanner
SLC 500
SER
FAC
)
CLASS I, GROUPS A, B, C AND D, DIV.2
U
L
FOR HAZ. LOC. A196
LISTED IND. CONT. EQ.
SA
)
OPERATING
TEMPERATURE
CODE T3C
HOST
FRN.:
CURRENT REQUIREMENT: 600 mA @5VDC
FRN.:
PLUG
MAKE IN U.S.A.
B
N
O
12
7
6
5
3
4
1. Status Led Displays normal communication and fault status
2. Front Label Allows user to record configured baud rate
3. RIO Link Connector Allows for connections to RIO link devices
4. Cable Tie Slots Secures communication wiring from module
5. Self-Locking Tabs Secures module in chassis slot
6. Side Label (Nameplate) Provides module information
7. Baud Rate DIP Switch Allows user to set baud rate
Baud Rate DIP Switch
The Baud Rate DIP switch selects the RIO link baud rate. The baud
rates are:
• 57.6 Kbaud
• 115.2 Kbaud
• 230.4 Kbaud
Publication 1747-UM013B-EN-P - January 2005
IMPORTANT
For proper system operation, the baud rate of all
devices on the RIO link must be the same.
Overview 1-19
LEDs
Two LEDs allow you to monitor scanner and communication status.
FAULT LED - allows you to monitor scanner status. This LED is red.
The FAULT LED’s normal state is off; therefore, it is off whenever the
scanner is operating properly.
COMM LED - allows you to monitor communication with all
configured devices. This LED is green and its normal state is on once
the processor has entered Run mode. The LED is red if there is a
communication problem. The COMM LED status information is valid
only when the FAULT LED is off.
RIO Link Connector
This 3-pin male connector connects the scanner to the RIO link. The
Allen-Bradley repair part number is 1746-RT29.
Compatible Devices
Catalog Number Device Comments
1785-LT/x
1785-LT2
1785-LT3
1785-L30x
1785-L40x
1785-L60x
1771-ASC Remote I/O Adapter Module -
1771-ASB
1771-AM1
1771-AM2
1784-F30D
1771-RIO Remote I/O Interface Module -
(1) (2)
(1)(2)
(1)(2)
(1)(2)
(1)(2)
(1)(2)
(3) (4)
(1)
(1)
(1)
PLC- 5/15 (in adapter mode) -
PLC- 5/25 (in adapter mode) -
PLC- 5/12 (in adapter mode) -
PLC- 5/30 (in adapter mode) -
PLC- 5/40 (in adapter mode) -
PLC- 5/60 (in adapter mode) -
Remote I/O Adapter Module -
1-Slot I/O Chassis W/Integral Power Supply and
Adapter
2-Slot I/O Chassis W/Integral Power Supply and
Adapter
Plant Floor Terminal Remote I/O Expansion
Module
-
-
-
Publication 1747-UM013B-EN-P - January 2005
1-20 Overview
Catalog Number Device Comments
1771-JAB
(1)
Single Point I/O Adapter Module Single Point I/O
-
Adapter Module
1771-DCM Direct Communication Module -
1778-ASB
1747-DCM
2706-xxxx
2705-xxx
(1)
(1)
(1)(5)
(1)
Remote I/O Adapter Module -
Direct Communication Module -
DL40 Dataliner -
RediPANEL Requires half logical rack configuration if you want to use
stored messages.Requires half logical rack configuration if
you want to use stored messages.
2711-xx
(1)
PanelView Terminal You can address PanelView Terminals as up to four full
logical racks of discrete I/O. You can also assign partial
logical racks.You can address PanelView Terminals as up to
four full logical racks of discrete I/O. You can also assign
partial logical racks.
1336-G2
(1)
Remote I/O Adapter for 1336 AC Industrial
-
Drives
1395-NA
(1)
Remote I/O Adapter for 1395 DC Industrial
-
Drives
1791-xxx Block I/O Products The adapter is built into the block.
1747-ASB
(1)
SLC 500 Remote I/O Adapter Module -
1794-ASB Flex I/O 24VDC Remote I/O Adapter -
(1) Extended node capability
(2) In adapter mode
(3) Series A, B, and C
(4) Extended node capability for Series B and C
(5) Must be Catalog Number 2706-ExxxxxB1
Publication 1747-UM013B-EN-P - January 2005
Chapter
2
Quick Start for Experienced Users
This chapter helps you to get started using the RIO Scanner. We base
the procedures here on the assumption that you have a basic
understanding of SLC 500 products.
You must:
• understand electronic process control
• be able to interpret the ladder logic instructions for generating
the electronic signals that control your application
Because it is a start-up guide for experienced users, this chapter does
not contain detailed explanations about the procedures listed. It does,
however, reference other chapters in this book where you can get
more detailed information. It also references other documentation that
may be helpful if you are unfamiliar with programming techniques or
system installation requirements.
Required Tools and Equipment
If you have any questions, or are unfamiliar with the terms used or
concepts presented in the procedural steps, always read the
referenced chapters and other recommended documentation before
trying to apply the information.
This chapter:
• tells you what tools and equipment you need
• lists preliminary considerations
• describes when to address, configure and program the module
• explains how to install and wire the module
• discusses system power-up procedures
Have the following tools and equipment ready:
• medium blade screwdriver
• programming equipment
• termination kit (package of resistors and ring lug included with
the scanner)
• approximately 15 inches of #20 AWG for grounding the drain
shield to the SLC chassis (for Series A retrofits)
• an adequate length of RIO communication cable (Belden 9463)
for your specific application
1 Publication 1747-UM013B-EN-P - January 2005
2-2 Quick Start for Experienced Users
Procedures
1. Check the contents of the shipping box.
Unpack the module making sure that the contents include:
• RIO Scanner (Catalog Number 1747 SN)
• termination kit
If the contents are incomplete, call your local Allen-Bradley
representative for assistance.
2. Ensure you chassis supports placement of the 1747-SN module.
Review the power requirements of your system to see that your
chassis supports placement of the scanner module. The scanner
consumes 600 mA @ 5VDC.
For modular style systems, calculate the total load on the system
power supply using the procedure described in the SLC 500
Modular Hardware Style User Manual, Publication 1747-UM011.
See Chapter 3, Installation and Wiring and Appendix A
Specifications in this manual.
3. Configure the module using the DIP switches.
Set the DIP switches (located on the printed circuit board) to the
desired baud rate. Note that all RIO devices must be configured
for the same baud rate.
Baud Rate DIP Switch Position
Switch 1 Switch 2
57.6K baud on on
115.2K baud on off
230.4K baud off on
230.4K baud off off
See Chapter 3, Installation and Wiring.
4. Insert the 1747-SN module into the chassis.
Publication 1747-UM013B-EN-P - January 2005
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