Overview
The Allen-Bradley 1747-SN Series B is a Remote I/O (RIO) scanner module designed for the SLC 500 control system family. It enables high-speed communication between an SLC processor and remotely located I/O chassis (1746 series) and other RIO-compatible devices, including HMIs, PanelView displays, and automation control equipment. The Series B revision provides extended node capability and reliable performance across industrial environments, making it ideal for applications requiring distributed I/O architecture across large facilities.
Key Features
- RIO Protocol Master: Facilitates communication between SLC processor and remotely located 1746 I/O chassis; serves as the master (scanner) connecting to multiple slaves (adapters)
- Extended Communication Range: Maximum distance for remote communication is 3,048m (10,000 ft.) using Belden 9463 twisted-pair cable
- Multiple Device Support: Can connect up to 16 devices in normal mode or 32 devices in complementary mode
- Flexible Baud Rate Configuration: Supports different baud rates of 57.6, 115.2, or 230.4 kbaud with DIP switch selection
- LED Diagnostics: Front section has LED indicators to show normal communication and fault status updates
- Low Power Draw: Uses a backplane current load of 600mA at 5V DC
Technical Specifications
- Processor Compatibility: Compatible with SLC 502, 503, 504, and 505 processors
- I/O Data Capacity: Transfers maximum of 4 logical racks (32 input and 32 output image words) of discrete remote I/O data into SLC input and output image files
- Backplane Current (5V DC): 600 mA
- Backplane Current (24V DC): 90 mA
- Maximum Thermal Dissipation: 4.5 Watts
- Operating Temperature Range: 0–60°C
- Communication Port: One (1) Remote I/O communication port used to communicate with RIO adapters
- Recommended Cable: Compatible with Belden 9463 cable
- Configuration Method: G-file required; DIP switch baud rate selection
- Mounting: Can be installed in any slot of the SLC chassis other than Slot 0
Typical Applications
The 1747-SN is widely used in:
- Distributed control systems requiring remote I/O monitoring and command across large facilities (warehouses, manufacturing plants, utilities)
- Printing and graphic arts equipment networks where applications require distributed controllers for I/O communications along with a supervisory controller or connections between I/O adapters and controllers
- Remote PanelView and HMI integration for centralized process visualization and control
- Multi-location I/O strategies where daisy-chained RIO adapters simplify field wiring and reduce installation costs
- Legacy SLC 500 system upgrades and expansions requiring high-speed remote communication
Compatibility & Replacements
Compatible With
- SLC 500 processors (SLC 5/02 through SLC 5/05)
- 1746 remote I/O chassis (all series)
- Allen-Bradley RIO adapter modules and devices
- PanelView operator terminals and displays
- RSLogix 500 programming software
- Allen-Bradley Remote I/O (RIO) Link network protocol
Replaces / Drop-In Replacement For
- 1747-SN Series A (Series B is backward compatible but offers extended functionality)
- Alternative part number designations: 1747-SNB, 1747-SN/B
- Direct replacement for legacy SLC 500 RIO scanner implementations
Works With
- Software: RSLogix 500, RSLinx, Studio 5000 (via OPC/gateway)
- Protocol: Allen-Bradley Remote I/O (RIO) link; communicates via block transfer instructions
- Cable Standards: Belden 9463 twisted-pair; supports 82-ohm terminating resistors
- Network Topology: Daisy-chain master-slave architecture with single scanner master and multiple adapter slaves
