Allen-Bradley SLC 500 Remote I/O Scanner Module Installation Guide
- July 8, 2024
- Allen Bradley
Table of Contents
Allen-Bradley SLC 500 Remote I/O Scanner Module
Specifications
- Model: Remote I/O Scanner
- Catalog Number : 1747-SN
- Publication: 1747-IN060D-EN-P – November 2002
- Operating Temperature: Standard range
- Current Requirement: 600 mA @ 5VDC
Product Usage Instructions
Installation Instructions:
Refer to the Remote I/O Scanner User Manual for detailed installation
instructions.
Configuration and Operation:
The SLC processor transfers a maximum of 4 logical racks of discrete remote
I/O data. Configure the scanner image files to transfer the required data. The
scanner can transfer up to 64 words via block transfer. Refer to the user
manual for configuration and programming details.
Hardware Features:
- RIO Link Connector for connection to the RIO link.
- Status LEDs for indicating scanner communication status.
- DIP Switch for configuration settings.
- Operating Temperature within the standard range.
- Current Requirement of 600 mA @ 5VDC.
For More Information
| For | Refer to this Document | Pub. No. |
|---|
A more detailed description on how to install, configure, and operate your
Remote I/O Scanner.| Remote I/O Scanner User Manual| 1747-6.6
A more detailed description on how to install and use your modular
SLC 500 system
| SLC 500 Modular Hardware Style Installation and Operation Manual| 1747-UM011
A reference manual that contains status file data and instruction set
information for SLC 500 processors.| SLC 500 Instruction Set Reference Manual|
1747-RM001
If you would like a manual you can:
- download a free electronic version from the internet: www.theautomationbookstore.com
- purchase a printed manual by:
- contacting your local distributor or Rockwell Automation representative
- by visiting www.theautomationbookstore.com and placing your order
- by calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside USA/Canada
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D
or non-hazardous locations only. The following WARNING statement applies to
use in hazardous locations.
EXPLOSION HAZARD
- Do not replace components or disconnect equipment unless power has been switched off.
- Do not connect or disconnect components unless the power has been switched off.
- All wiring must comply with N.E.C. article 501-4(b).
Overview
The Remote I/O (RIO) Scanner, 1747-SN, enables communication between an SLC™ processor and remotely located 1746 I/O chassis and other RIO-compatible 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 3,048m (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)
Hardware Features
The figure below shows the scanner’s features. RIO Link Connector, Status LED, and DIP Switch information follows.
RIO Link Connector
This 3-pin male connector connects the scanner to the RIO link. The Allen-
Bradley replacement part number is 1746-RT29.
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 | Status Information |
|---|---|---|
| Flashing Red | Not applicable | Scanner configuration error. |
No RIO link communication attempted.
Duplicate scanner detected on RIO link.
Red| Not applicable| Major fault on scanner.
No RIO link communication attempted.
Off| Red| Hardware fault detected.
Off| Off| Scanner is operating properly.
Scanner is offline (no RIO link communication attempted).
Off| Green| Scanner is operating properly.
Scanner is online (active communication established with all devices).
Off| Flashing Green| Scanner is operating properly.
At least one configured RIO link device is not communicating.
Off| Flashing Red| Scanner is operating properly.
None of the configured RIO link devices are communicating.
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.
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
Installation
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
- Disconnect power.
- 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.
- Slide the module into the chassis until the top and bottom latches catch.
- 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.
- Insert the cable tie in the slots.
- Route the cable down and away from the module, securing it with the cable tie.
- Cover all unused slots with the Card Slot Filler, Catalog Number 1746-N2.
Removal
- Disconnect power.
- Remove all cabling.
- Press the releases at the top and bottom of the module and slide the module out of the chassis slot.
- 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.
| Baud Rate| Max. Cable Distance (Belden 9463)| Resistor
Size
---|---|---|---
Using Extended Node Capability| 57.6K baud| 3048 m (10,000 ft.)| 82W 1/2
Watt Gray-Red-Black-Gold
115.2K baud| 1524 m (5,000 ft.)
230.4K baud| 762 m (2,500 ft.)
Not Using Extended Node Capability| 57.6K baud| 3048 m (10,000 ft.)|
150W 1/2 Watt Brown-Green-Brown-Gold
115.2K baud| 1524 m (5,000 ft.)
230.4K baud| 762 m (2,500 ft.)| 82W 1/2 Watt Gray-Red-Black-Gold
For New Installations
To ensure a proper earth ground of the cable shield, follow these steps:
- 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.
- Attach the ring terminal lug (supplied) to the end of the shield drain wire.
- 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.
For Series A Scanner Retrofits
Refer to the illustration on page 10. To eliminate the need to strip the
cable back, follow these steps:
- Attach the shield wire and a short piece of #20 AWG wire (dotted line) to the shield lug of the RIO link connector.
- Attach the other end of the #20 AWG wire to the ring terminal lug.
- 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 Compensation | 600 mA at 5V dc |
|---|---|
| Operating Temperature | 0°C to +60°C (+32°F to +140°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 5 to 95% without condensation |
| Noise Immunity | NEMA Standard ICS 2-230 |
| Agency Certification | UL / C-UL listed |
Class I, Division 2, Groups A, B, C, D CE marked for all applicable directives C-Tick marked for all applicable acts
Rockwell Automation, Allen-Bradley, SLC 500, PanelView, RediPANEL, Dataliner,
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Copyright © 2007 Rockwell Automation, Inc. All rights reserved. Printed in Singapore.
FAQ
- Q: What hazardous locations is the equipment suitable for?
- A: The equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only.
- Q: How many logical racks of data can the SLC processor transfer?
- A: The SLC processor can transfer a maximum of 4 logical racks of discrete remote I/O data.
- Q: What is the maximum number of scanners supported in a local SLC chassis?
- A: The maximum number of scanners supported in a local SLC chassis depends on the SLC processor and other modules present. Refer to the user manual for detailed information.