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Description
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 1747-SCNR |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | ControlNet Scanner Module |
| Product Line | SLC 500 |
| Communication Protocol | ControlNet |
| Compatible Processors | SLC 5/02, 5/03, 5/04, 5/05 -1 |
| ControlNet Ports | 2 x BNC (Channel A and Channel B) -1 |
| Media Configuration | Non-redundant and Redundant Media -1 |
| Backplane Current Draw (5V DC) | 800 mA typical / 900 mA maximum -1-9 |
| Backplane Current Draw (24V DC) | 90 mA -1 |
| Maximum Scheduled Connections | 64 -3 |
| Maximum Unscheduled Connections | 50 -3 |
| Maximum ControlNet Nodes | 99 -1-5 |
| Chassis Location | Any slot except leftmost slot -2 |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) -1 |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) -1 |
| Relative Humidity | 5-95% (Non-condensing) -1 |
| Operational Shock | 30G -1 |
| Non-operational Shock | 50G -1 |
| Weight | Approximately 0.23-0.45 kg -1-12 |
| ControlNet Media | 1786-RG6 RG-6 Quad Shield Cable -1 |
| ControlNet Taps | 1786-TPR, 1786-TPS, 1786-TPYR, 1786-TPYS -1 |
Main Features and Advantages
Redundant Media Support for High Availability: The Allen‑Bradley 1747-SCNR features dual BNC connectors (Channel A and Channel B) that support both non-redundant and redundant ControlNet media configurations -1-2. In redundant mode, the 1747-SCNR automatically switches to the backup channel in the event of a cable break or failure on the primary channel, ensuring uninterrupted communication for mission-critical applications. This fault-tolerant design makes the 1747-SCNR the preferred choice for continuous process operations where network downtime is unacceptable, such as power generation and chemical processing facilities.
M0/M1 File Transfer for Large Data Exchange: The 1747-SCNR supports M0/M1 file transfer methodology, enabling efficient movement of large volumes of data between SLC 500 processors and the scanner module -1-3. The M0 file provides 256 words of unscheduled local database memory accessible via CIP messaging, allowing remote devices and HMIs to exchange data with the SLC processor -3-6. This flexible data management capability ensures that the Allen‑Bradley 1747-SCNR can handle both discrete I/O scanning and complex data exchanges required for advanced control applications.
Extensive I/O Platform Compatibility: The 1747-SCNR provides comprehensive I/O control capabilities across multiple Rockwell Automation platforms, including 1746, 1771, and 1756 I/O families -9. The Allen‑Bradley 1747-SCNR can also control 1788-CN2DN and 1788-CN2FF linking devices, enabling connection to DeviceNet and FOUNDATION Fieldbus networks -9. This broad compatibility allows system integrators to leverage existing I/O investments while migrating to ControlNet networking, providing a cost-effective path for system modernization.
Comprehensive Diagnostic and Status Indication: The 1747-SCNR features a four-character alphanumeric display and LED status indicators (OK, CHA, CHB) that provide real-time operational information including node address, I/O connection status, and module mode -2-4. The alphanumeric display shows diagnostic mnemonics such as “I/OU” (all connections established), “I/OX” (configuration error), and “IDLE”/”RUN” (scanner mode), enabling rapid troubleshooting without requiring programming software -4. The module status word in the M1 file provides additional diagnostic data for integration into operator interface systems.
CIP Client Messaging and PLC-5 Compatibility: The Allen‑Bradley 1747-SCNR provides CIP client messaging capability, allowing ladder logic programs to manually build message requests for up to approximately 240 words of data -3. The module also supports PLC-5 MSG instructions for remote access to its local database, enabling seamless data exchange between SLC 500 and PLC-5 controllers on the same ControlNet network -6. This interoperability ensures that the 1747-SCNR can serve as a bridge between legacy and modern control systems.
