Description
The Allen-Bradley 1783-US8T is an industrial-grade, unmanaged Ethernet switch equipped with eight 10/100 Mbps copper ports. It provides layer 2 connectivity for local automation networks without requiring software configuration, IP addressing, or management overhead. Operating on a 24 V AC/DC power supply, this compact, DIN-rail mounted device connects controllers, I/O chassis, human-machine interfaces (HMIs), and other network-enabled equipment on the factory floor.
Commercial Availability & Procurement Terms
- Condition: New Original (Factory Sealed)
- Warranty: 12-Month Functional Warranty
- Availability: In Stock
- Standard Lead Time: Ships within 1–2 business days via global couriers (DHL, FedEx, UPS)
- Pricing Policy: Indicative pricing only. Price fluctuates based on market conditions, global logistics, and supply chain availability. Contact our sales department for a formal, firm quote.
Technical Specifications
| Parameter | Specification / Value |
| Model Number | 1783-US8T |
| Product Series | Stratix 2000 |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Total Ports | 8 |
| Port Type | RJ45 Copper (Ethernet) |
| Speed | 10/100 Mbps (Auto-negotiating, Full/Half Duplex) |
| MDI/MDIX crossover | Automatic detection and adjustment |
| Input Voltage Range | 18 to 30 V DC / 18 to 26 V AC (50/60 Hz), Class 2 |
| Inrush Current | 2.2 A maximum |
| Power Consumption | 4.0 W maximum at 24 V DC |
| Mounting | 35 mm DIN rail (Top hat standard) |
| Operating Temperature | −10 to +60 °C (+14 to +140 °F) |
| Storage Temperature | −40 to +85 °C (−40 to +185 °F) |
| Relative Humidity | 5% to 95%, non-condensing |
| Enclosure Rating | IP20 |
Deployment Constraints & Engineering Notes
1. Architectural Limitations of Unmanaged Switches
The 1783-US8T lacks a microprocessor-driven management layer. It cannot configure Virtual Local Area Networks (VLANs), restrict traffic via Access Control Lists (ACLs), or monitor ports via Simple Network Management Protocol (SNMP).
Field Warning: Because this switch does not support Internet Group Management Protocol (IGMP) snooping, it treats multicast traffic as broadcast traffic, forwarding it out of all ports. Do not deploy this switch as the central distribution node in networks featuring high concentrations of EtherNet/IP implicit I/O messaging, as it can saturate downstream device network interface cards (NICs).
2. Broadcast Storm Protection
The Series B hardware revisions of the 1783-US8T incorporate built-in broadcast storm protection. When broadcast traffic exceeds a hardcoded threshold on a port, the switch temporarily discards broadcast packets on that port to prevent network collapse. Verify your specific hardware revision if your system relies on legacy unmanaged network architectures where this behavior could interrupt baseline communications.
3. Power and Grounding Constraints
The unit features a removable, 3-pin terminal block for power connections. The functional earth (ground) terminal must be tied directly to a clean, low-impedance industrial grounding busbar using the shortest possible wire run to ensure proper electromagnetic compatibility (EMC) shielding and surge protection.
Frequently Asked Questions
Does the 1783-US8T support Power over Ethernet (PoE)?
No. All eight copper RJ45 ports are strictly designed for data communication. Connecting PoE power sourcing equipment (PSE) directly to this switch can damage the internal circuitry if it does not adhere to standard auto-sensing isolation protocols; verify with your OEM device specifications before connection.
How do I configure the speed and duplex settings on this switch?
There are no configuration dip switches or software interfaces. The 1783-US8T relies completely on hardware auto-negotiation to detect and match the link speed (10 Mbps or 100 Mbps) and duplex mode (half or full) of the connected end device. If the end device is locked to a specific speed/duplex without auto-negotiation enabled, the switch defaults to half-duplex, which may introduce packet collisions.
Can this unit be used in hazardous locations?
The Stratix 2000 series holds various certifications including c-UL-us, CE, and Ex marks for specific environments. However, exact hazardous location ratings (such as Class I Division 2) can vary depending on the product series revision and manufacturing date. Review the physical label on the side of the module housing and the manufacturer certification sheets prior to installation in hazardous zones.
