Configured for DeviceNet network management in SLC 500 chassis assemblies, the Allen-Bradley 1747-SDN (1747-SDN DeviceNet Scanner Module) provides direct physical/electrical execution of master-mode I/O scanning and field device data exchange.
Hardware Specifications
Parameter
Specification
Brand
Allen-Bradley
Model
1747-SDN
Origin
USA
Weight
0.18 kg (0.40 lbs)
Dimensions
Single-slot SLC 500 chassis footprint
Operating Temp
Standard SLC 500 rating (0 to 60 deg C operational)
Power Consumption
90 to 500 mA backplane current
Operating Voltage
5 to 24 VDC
Communication Protocol
DeviceNet
Data Transfer Speed
125 kbps
Port Types
DeviceNet 5-pin open connector, RS-232, Ethernet
Mounting Style
DIN Rail / Panel Mount (via SLC 500 chassis frame)
Slot Width
1 slot (supports up to 30 chassis slots per system map)
The module acts as a communications bridge between the SLC 500 backplane bus and field-level DeviceNet devices, executing cyclic exchange of discrete and analog I/O structures. Inter-module messaging maps remote device data directly into SLC processor image tables without incurring scan delays. Backplane bus communication velocity combined with firmware flash compatibility allows deterministic device management across CAN-based DeviceNet loops, ensuring high data throughput and precise diagnostic status tracking.
Frequently Asked Questions
Q: What data transfer rate does the 1747-SDN module support on the DeviceNet trunkline?
A: The 1747-SDN operates at a baseline communication data transfer speed of 125 kbps across the connected DeviceNet cable system.
Q: What is the backplane current draw range for sizing the SLC 500 power supply?
A: Depending on network load and configuration mode, the module draws between 90 mA and 500 mA from the chassis backplane power supply.
Q: Can the 1747-SDN scanner module reside in any slot within an SLC 500 rack?
A: Yes, the module occupies a single chassis slot and can be installed in any available I/O slot (excluding slot 0 reserved for the CPU processor).
Field Installation Guidelines
Ensure the SLC 500 rack power supply is turned off before inserting or removing the 1747-SDN module. Slide the board into the designated chassis slot guide rails until the retaining latches click firmly into position.
Terminate the DeviceNet trunkline using 121 ohm, 1/4-watt resistor assemblies across the blue and white communication signal conductors at each physical end of the main trunk. Connect the 5-pin unpluggable terminal block, ensuring correct color-coded wire orientation (V+, CAN H, Shield, CAN L, V-). Route network cables away from high-voltage AC conductors and verify that the 24 VDC DeviceNet thick/thin cable power supply is grounded at a single central point.
