Remote I/O Scanner
Catalog Number 1747-SN
Installation Instructions
Publication 1747-5.33
2 Remote I/O Scanner
Important User Information
Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Allen-
Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the Application,
Installation, and Maintenance of Solid-State Control (available from your local
Allen-Bradley office), describes some important differences between solid-state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of Allen-Bradley Company, Inc., is prohibited.
Throughout this manual we use notes to make you aware of safety considerations:
!
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage or economic loss.
Attention statements help you to:
• identify a hazard
• avoid the hazard
• recognize the consequences
Important: Identifies information that is critical for successful application and understanding of the product.
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Remote I/O Scanner 3
For More Information
As part of our effort to preserve, protect, and improve our environment, Allen-
Bradley is reducing the amount of paper we use. Less paper means more options for you. In addition to traditional printed publications and CD-ROM versions, we now offer online materials with the most up-to-date information you can get.
We recommend that you read the related publications listed below before starting up your control system.
Related Publications
For
A more detailed description on how to install, configure, and operate your
Remote I/O Scanner.
A more detailed description on how to install and use your modular
SLC 500™ system
A reference manual that contains status file data and instruction set information for SLC 500 processors.
Refer to this Document
Remote I/O Scanner
User Manual
SLC 500 Modular Hardware Style
Installation and Operation Manual
SLC 500™ and MicroLogix™
1000 Instruction Set Reference
Manual
Pub. No.
1747-6.6
1747-6.2
1747-6.15
How to Get More Information
For Obtain Information By
Fast access to related publications
Publications in printed format
Multiple copies of a manual
• Visiting the Automation Bookstore at
http://www.theautomationbookstore.com — Electronic versions of our manuals are available for you to search and download.
• Calling (440) 646-5436 for the Allen-Bradley Fax Back service. You will be faxed information on the topic you request.
Ordering a manual using one of the following methods:
• Filling out and returning the User Manual Request Card that was shipped with the unit.
• Visiting the Automation Bookstore at http://www.theautomationbookstore.com
• Visiting the Automation Bookstore at http://www.theautomationbookstore.com
Publication 1747-5.33
4 Remote I/O Scanner
Overview
The Remote I/O (RIO) Scanner, 1747-SN, enables communication between an
SLC™ processor and remotely located 1746 I/O chassis and other RIOcompatible Allen-Bradley operator interface and control devices. The 1747-SN scanner communicates with remote devices using the A-B 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. Maximum distance for remote communication is
3,048 m (10,000 ft.). The scanner is compatible with any standard RIO adapter device.
The SLC processor transfers a maximum of 4 logical racks (32 input and 32 output image words) of discrete remote I/O data into the SLC input and output image files. You can adjust the size of the scanner image files during configuration of your SLC system so that the scanner only transfers the discrete
I/O data required by your application program. The 1747-SN Series B or later
RIO Scanner can be configured to transfer up to 64 words of data to a remote device via block transfer. Refer to publication 1747-6.6, Remote I/O Scanner
User Manual, for information on configuration, programming, and block transfers.
The SLC 500™ processor (SLC 5/02™ or higher) 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 input and output bits)
• processor memory to support the application (SLC processor dependent)
SLC 5/02 or later processor
RIO Scanner
(Master of the RIO Link)
1747-ASB Module
(Adapter/Slave)
Local SLC Chassis
Remote Chassis Remote
Expansion Chassis
Dataliner™ Message Display
(Adapter/Slave)
PanelView™ Operator Terminal
(Adapter/Slave)
RediPANEL™
(Adapter/Slave)
Publication 1747-5.33
Remote I/O Scanner
Hardware Features
The figure below shows the scanner’s features. RIO Link Connector, Status
LED, and DIP Switch information follows.
SCANNER
COMM FAULT
Status
LEDs
O
N
SW1
1 2
1
ON
ON
ON
OFF
OFF
OFF
ON
OFF
2 KBAUD
57.6
115.2
230.4
230.4
CONNECT ONE END OF
CABLE SHIELD TO CHASSIS
MOUNTING BOLT. REFER TO
USERS MANUAL.
Line 1
Shield
Line 2
B
Dip Switch Cable Tie Slots
1747-SN
RIO Link Connector
RIO Link Connector
This 3-pin male connector connects the scanner to the RIO link. The
Allen-Bradley repair part number is 1746-RT29.
5
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6 Remote I/O Scanner
Status LEDs
The scanner has two LEDs, FAULT and COMM, which indicate its operating status.
FAULT LED - indicates the scanner’s overall status. The red FAULT LED is off whenever the scanner is configured and operating properly.
COMM LED - allows you to monitor communication with all configured devices. This LED is green once the scanner is in the Run mode. It is red if a hardware fault is detected. The COMM LED status information is valid only when the FAULT LED is off.
The table below explains the scanner and communication status as indicated by the FAULT and COMM LEDs.
FAULT LED COMM LED
Flashing
Red
Red
Off
Off
Off
Off
Off
Not applicable
Not applicable
Red
Off
Green
Flashing
Green
Flashing
Red
Status Information
Scanner configuration error.
No RIO link communication attempted.
Duplicate scanner detected on RIO link.
Major fault on scanner.
No RIO link communication attempted.
Hardware fault detected.
Scanner is operating properly.
Scanner is offline (no RIO link communication attempted).
Scanner is operating properly.
Scanner is online (active communication established with all devices).
Scanner is operating properly.
At least one configured RIO link device is not communicating.
Scanner is operating properly.
None of the configured RIO link devices are communicating.
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Remote I/O Scanner
Baud Rate DIP Switch
The figure below shows the location of the DIP switch and the DIP switch settings for the supported baud rates.
Important: For proper system operation, the baud rate of all devices on the RIO link must be the same.
7
57.6K baud
115.2K baud
230.4K baud
230.4K baud
Required Tools and Equipment
Have the following tools and equipment ready:
• medium blade screwdriver
• termination kit (the package, containing resistors and a ring lug, which was included with the scanner)
• approximately 38 cm (15 inches) of #20 AWG wire for grounding the drain shield to the SLC chassis (for Series A retrofits)
• adequate length of RIO communication cable (Belden™ 9463) for your specific application
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8 Remote I/O Scanner
Installation
!
ATTENTION: Disconnect system power before attempting to install, remove, or wire the module.
Make sure you have set the DIP switch properly before installing the scanner.
Important: Before installation, make sure that your modular SLC power supply has adequate reserve current capacity. The scanner requires 600 mA at 5V dc.
Insertion
Module Release
Card Guide
Cable Tie
1. Disconnect power.
2. Align the full-sized circuit board with the chassis card guides. The first slot
(slot 0) of the first rack is reserved for the SLC 500 processor.
3. Slide the module into the chassis until the top and bottom latches catch.
4. Attach the RIO link cable to the connector on the front of the module, behind the door. Ground the cable’s shield wire to a chassis mounting
bracket. Refer to the RIO link wiring illustration on page 10.
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Remote I/O Scanner 9
5. Insert the cable tie in the slots.
6. Route the cable down and away from module, securing it with the cable tie.
7. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.
Removal
1. Disconnect power.
2. Remove all cabling.
3. Press the releases at the top and bottom of the module and slide the module out of the chassis slot.
4. Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.
RIO Link Wiring
The scanner is connected to other devices on the RIO link in a daisy chain (serial) configuration. There are no restrictions governing the space between each device, provided the maximum cable distance (Belden™ 9463) is not exceeded.A 1/2 watt terminating resistor (included with the module) must be attached across line 1 and line 2 of the connectors at each end (scanner and last physical device) of the RIO link. The size of the resistor depends on the baud rate and extended node capability, as shown in the table below.
Note:
To use extended node, all devices on the RIO link must support it. Refer to each device’s user manual.
Using Extended
Node Capability
Not Using
Extended Node
Capability
Baud Rate
57.6K baud
115.2K baud
230.4K baud
57.6K baud
115.2K baud
230.4K baud
Max. Cable Distance
(Belden 9463)
3048 m (10,000 ft.)
1524 m (5,000 ft.)
762 m (2,500 ft.)
3048 m (10,000 ft.)
1524 m (5,000 ft.)
762 m (2,500 ft.)
Resistor Size
82
Ω
1/2 Watt
Gray-Red-Black-Gold
150
Ω
1/2 Watt
Brown-Green-Brown-Gold
82
Ω
1/2 Watt
Gray-Red-Black-Gold
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10 Remote I/O Scanner
RIO Scanner
Terminating Resistor
Last Physical Device End
RIO Link
Connector RIO Link
Connector
Terminating
Resistor
Scanner End
Chassis Mounting
Bracket
Line 1 – Blue
Shield – Shield
Line 2 – Clear
Ring Lug Shield
Drain Wire
Shield Drain Wire
(For Series A Retrofits)
(For New Series B Installations)
For New Installations
To ensure a proper earth ground of the cable shield, follow these steps:
1. While the RIO link connector is plugged into the scanner and lines 1 and 2 are connected, strip the cable back to expose enough shield drain wire to reach a chassis mounting bracket.
2. Attach the ring terminal lug (supplied) to the end of the shield drain wire.
3. Attach the ring terminal lug to the SLC chassis mounting bracket. Note that for new installations the middle (shield) terminal is not used when connecting to the scanner.
Important: The RIO cable shield must be grounded at the scanner end only.
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Remote I/O Scanner 11
For Series A Scanner Retrofits
Refer to the illustration on page 10. To eliminate the need to strip the cable back,
follow these steps:
1. Attach the shield wire and a short piece of #20 AWG wire (dotted line) to the shield lug of the RIO link connector.
2. Attach the other end of the #20 AWG wire to the ring terminal lug.
3. Attach the ring terminal lug to a chassis mounting bracket.
Important: The RIO cable shield must be grounded at the scanner end only. Ensure that the unshielded portion of the link communication wire (blue and clear) is as short as possible.
Specifications
Backplane Current Consumption
Operating Temperature
Storage Temperature
Humidity
Noise Immunity
Agency Certification
600 mA at 5V dc
0°C to +60°C (+32°F to +140°F)
-40°C to +85°C (-40°F to +185°F)
5 to 95% without condensation
NEMA Standard ICS 2-230
UL listed / CSA Certified
Class I, Division 2, Groups A,B, C, D
CE marked for all applicable directives
Publication 1747-5.33
PLC is a registered trademark of the Rockwell Automation, Inc.
SLC, SLC 500, SLC 5/02, PanelView, RediPANEL, Dataliner, Flex I/O, PLC–5/15, PLC–5/12,
PLC–5/25, PLC–5/30, PLC–5/40, PLC–5/60 are trademarks of Rockwell Automation, Inc.
Belden is a trademark of Belden, Inc.
Publication 1747-5.33 – August 1998 40071-039-01(A)
1998 Rockwell International. All Rights Reserved. Printed in USA
