1747-SDN Allen-Bradley SLC 500 Datasheet & Technical Manual

1747-SDN Allen-Bradley SLC 500 DeviceNet Scanner Module

1747-SDN Allen-Bradley SLC 500 DeviceNet Scanner Module

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Allen-Bradley 1747-SDN DeviceNet Scanner Module The Allen-Bradley 1747-SDN, also cataloged as the 1747-SDN DeviceNet Scanner Module, operates as a dedicated...

SKU: 1747-SDN

Manufacturer: Allen Bradley
Product No.: 1747-SDN
Product Type: Communication Adapter Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 170g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Allen-Bradley 1747-SDN DeviceNet Scanner Module

The Allen-Bradley 1747-SDN, also cataloged as the 1747-SDN DeviceNet Scanner Module, operates as a dedicated hardware component for master communication interface management and field device data exchange within Allen-Bradley SLC 500 platforms.

Hardware Specifications

Parameter	Specification
Model	1747-SDN
Brand	Allen-Bradley
Origin	USA
Weight	0.17 kg (0.37 lbs)
Dimensions	Standard SLC 500 module width x height x depth
Operating Temp	0 to +55 deg C
Power Consumption	500 mA at 5 VDC (backplane bus)
DeviceNet Current Draw	90 mA at 24 VDC (sourced from network supply)
DeviceNet Voltage	11 to 25 VDC network operating voltage
Baud Rates	125 kbps, 250 kbps, 500 kbps
Node Capacity	Up to 63 slave nodes (Nodes 0–63, Scanner occupies 1 node)
Messaging Modes	Polled, Strobe, Cyclic, Change-of-State (COS)
Isolation	500 VDC continuous (DeviceNet port to SLC backplane)

Deterministic Networks and Backplane Bus Velocity

The module establishes high-speed network communication between SLC 500 controllers and distributed field nodes over DeviceNet CAN-based networks. Operating at selectable baud rates up to 500 kbps, the scanner manages cyclical, polled, strobe, and Change-of-State (COS) messaging protocols to minimize network bandwidth usage. Integrated backplane interface circuits exchange input/output image tables directly with SLC 5/03, 5/04, or 5/05 processors at maximum backplane bus communication velocity. Onboard logic provides transparent network pass-through execution, allowing programming software to configure downstream field devices across the SLC backplane without disconnecting physical network nodes. A front-panel 2-digit LED status display continuously outputs diagnostic fault codes to report node communication drops and line disruption states in real time.

Frequently Asked Questions

Q: What are the backplane power supply considerations when installing the scanner module into an SLC 500 rack?

A: The module draws 500 mA at 5 VDC directly from the SLC chassis backplane power supply. Field engineers must calculate the total 5 VDC power budget of all rack-mounted modules to prevent overloading the local chassis power supply unit.

Q: How is the external DeviceNet network transceiver circuit powered?

A: The network side requires a dedicated 24 VDC linear power supply operating between 11 VDC and 25 VDC. The module draws 90 mA at 24 VDC directly from the DeviceNet thick/thin trunk cable to energize its isolated transceiver circuitry.

Field Installation Guidelines

Insert the module into any available I/O slot of a powered-down SLC 500 chassis (excluding slot 0, which is reserved for the CPU processor). Push the module along the card guide rails until top and bottom retaining latches snap into position to lock the assembly to the chassis rack.

Connect the 5-pin open-style DeviceNet sealed connector block to the module front interface according to standard signal color coding (V+, CAN High, Shield, CAN Low, V-). Install 121-ohm, 1/4-watt metal film terminating resistors across the CAN High and CAN Low lines at both physical ends of the trunk cable line to suppress signal reflections and maintain network impedance stability.

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