Allen-Bradley 1783-US8T Stratix 2000 Unmanaged Ethernet Switch

The Allen-Bradley 1783-US8T, also cataloged as the 1783-US8T Unmanaged Ethernet Switch, operates as a dedicated hardware component for network layer switching and copper media interconnectivity within Stratix 2000 industrial automation platforms.

Hardware Specifications

EtherNet/IP Deterministic Network Physical Execution

The 1783-US8T executes wire-speed 10/100 Mbps switching across eight RJ45 copper ports to route EtherNet/IP traffic between controllers, I/O drops, and human-machine interfaces. As an unmanaged switch, it eliminates configuration latencies while providing physical-layer signal isolation across connected automation nodes. Operating on 24 VDC nominal power, the device manages internal power dissipation to maintain high component reliability and prevent packet loss during bursts of industrial network traffic.

Frequently Asked Questions

Q: What are the primary power input requirements and current limits for the 1783-US8T switch?

A: The 1783-US8T accepts 12 to 48 VDC (250 mA) or 18 to 30 VAC at 50/60 Hz (500 mA), with a maximum continuous power consumption of 4.6 W and a peak inrush current limit of 1.31 A.

Q: Does the 1783-US8T require IP address initialization or software configuration before deployment?

A: No, the 1783-US8T is an unmanaged layer-2 switch that functions immediately upon applying power and connecting Ethernet cables, requiring no software setup, managed firmware parameters, or IP addressing.

Field Installation Guidelines

1. DIN Rail Mounting: Snap the unit onto a standard 35 mm DIN rail in a vertical orientation inside an industrial enclosure, verifying that the top metal locking latch secures tightly to the rail.
2. Power Supply Wiring: Connect 24 VDC power wiring to the removable terminal block. Ensure conductor wire gauge matches field specifications and observe correct polarity to prevent reverse power damage.
3. Ethernet Cabling: Use Category 5e or Category 6 shielded twisted-pair (STP) cables terminated with industrial RJ45 connectors. Keep cable run lengths under 100 meters per port.
4. Shield Grounding: Ground the Ethernet cable shields and the switch enclosure grounding screw directly to the main cabinet earth ground bus to mitigate high-frequency EMI noise.
5. Thermal Clearance: Maintain at least 50 mm (2 inches) of free air space above and below the switch housing to ensure natural convection cooling across the internal heat sink structure.