Allen‑Bradley 1747-SDN DeviceNet Scanner for SLC 500 – Fast, Reliable DeviceNet Integration

The Allen‑Bradley 1747-SDN is the go‑to DeviceNet scanner module for the SLC 500 platform. It sits in a standard 1746 chassis slot and acts as the master on a DeviceNet network, making it straightforward to connect distributed I/O, valves, drives, and smart sensors to an SLC processor. From my experience, it’s a practical choice for brownfield upgrades where you need stable DeviceNet handling without re‑architecting your control system.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days
• Lead time: 1 week if in stock; no more than 1 month at the latest
• Payment: 50% advance; full payment before delivery
• Express options: FedEx, UPS, DHL

Key Features

• DeviceNet Master/Scanner – Manages DeviceNet I/O devices as the network master, handling polled, cyclic, and bit‑strobed data in most setups.
• Seamless SLC 500 integration – Installs in a 1746 chassis slot and exchanges data with the SLC processor over the backplane, so your ladder logic stays clean.
• Multi‑rate support – Typical DeviceNet baud rates of 125, 250, and 500 kbps for flexible network design and cable lengths.
• Node capacity – Supports addressing of up to 63 DeviceNet slave nodes in many cases, suitable for mid‑to‑large cells.
• Diagnostics you can trust – Front status LEDs for module and network health; you’ll spot wiring or power issues quickly during commissioning.
• Explicit messaging – Read/write parameter access for drives and smart devices, not just simple I/O data.
• Proven ecosystem – Works with common DeviceNet components like valve manifolds, VFDs, safety interlocks, and barcode scanners.

Technical Specifications

Application Fields

You’ll typically see the 1747-SDN used in automotive body shops, tire and rubber lines, packaging and palletizing cells, material handling systems, and process skids where DeviceNet devices already exist. One thing I appreciate is how fast you can bring legacy valve manifolds and drives online—especially during phased modernizations where the SLC remains for a few more years.

Advantages & Value

• Reliability – Stable DeviceNet scanning with clear status LEDs reduces downtime during fault tracing.
• Compatibility – Works cleanly with the SLC 500 family and mainstream DeviceNet devices; saves engineering hours.
• Cost Control – Keeps existing DeviceNet investments productive; avoids immediate rip‑and‑replace to Ethernet/IP.
• Supportability – Configuration through familiar Rockwell tools (RSLogix 500/RSNetWorx for DeviceNet) makes maintenance straightforward.

Customer feedback from a recent retrofit: “Swapping in a 1747-SDN and reusing the DeviceNet trunk cut our commissioning by two days. Diagnostics were simple—the network LED told the story.”

Installation & Maintenance

• Cabinet environment – Maintain 0–60 °C, non‑condensing humidity, and adequate ventilation. Keep DeviceNet trunk away from high‑noise VFD cabling where possible.
• Chassis & wiring – Install in a 1746 chassis with proper keying. Use DeviceNet‑rated cable, correct color‑coded 5‑pin open‑style connector, and end‑of‑line 121 Ω terminators at both ends of the trunk.
• Network power – The scanner does not power the bus; supply a clean 24 VDC DeviceNet power source sized for all nodes, with correct grounding and shielding.
• Commissioning – Set node addresses/baud rate consistently; validate with RSNetWorx for DeviceNet. Verify scan lists and I/O mapping before handing off to the SLC logic.
• Routine maintenance – Periodically inspect connector torque, trunk continuity, and shield integrity. Keep firmware current where applicable, typically via ControlFLASH through the backplane.
• Safety – De‑energize before inserting/removing the module. Follow lockout/tagout and ESD handling practices.

Quality & Certifications

• Certifications typically include CE and UL/cUL; RoHS compliance on most later series
• Manufactured under ISO 9001 quality systems
• Warranty: 12 months (365 days)