Secure 1783-US8T now for simple, high-speed industrial connectivity
The Allen-Bradley 1783-US8T is a compact, 8-port unmanaged Ethernet switch from the rugged Stratix 2000 series. Designed for small-to-medium machine networks, it offers seamless integration of automation devices without the heavy overhead of IT configuration. Operating entirely as a plug-and-play device, it is the ideal networking hub for localized control panels.
Technical Specifications
- Total Ports: Eight (8) active network ports.
- Port Type: 10/100 Mbps Fast Ethernet copper (RJ45).
- Duplex Operation: Full/Half Duplex with auto-negotiation.
- Power Requirements: 20V AC or 24V DC nominal (Input range: 10-24V AC, 10-35V DC).
- Inrush Current: 2.2 A maximum.
- Enclosure: IP20 rated, DIN rail mountable.
Comprehensive Technical Overview
In many automation architectures, a fully managed switch is unnecessary and adds unwarranted cost and complexity. The 1783-US8T fills the need for a highly reliable, industrial-grade data distribution point. Featuring eight fast Ethernet ports, it provides enough capacity to network a central PLC with several remote I/O blocks, an HMI, and a couple of motor drives. The switch uses a store-and-forward switching mechanism to ensure data integrity; it reads the entire data packet, checks the CRC (Cyclic Redundancy Check) for errors, and only forwards the packet if it is perfectly intact. The device also supports Auto-MDI/MDIX, meaning it automatically configures its ports to accommodate both straight-through and crossover Ethernet cables. With an extremely low power consumption of approximately 4W (6VA), it generates minimal heat, allowing it to be packed tightly into crowded electrical enclosures without causing thermal throttling issues. Furthermore, the 1783-US8T features broadcast storm protection, a critical mechanism that prevents faulty network interface cards (NICs) on connected devices from flooding the network with garbage data, which would otherwise crash the entire machine cell. The ruggedized IP20 housing is designed to withstand the harsh vibrations and mechanical shocks typical of continuous manufacturing operations.
Expert Installation Advice
When mounting the 1783-US8T to a DIN rail, ensure that the functional grounding connection is made using a robust 2.5 mm² (14 AWG) copper wire. This wire should be rated for at least 30°C above the surrounding ambient temperature. Proper grounding is essential to protect the internal solid-state components from electrostatic discharge (ESD) and common-mode voltage noise. Utilize redundant power supplies to feed the dual power inputs, safeguarding the network from a single-point electrical failure.
Professional Maintenance Tips
Because this is an unmanaged switch, it has no IP address or web interface. All diagnostics must be performed visually via the front panel LEDs. If a specific port loses connectivity, verify that the green link LED is illuminated. If it is dark, inspect the physical RJ45 cable for pin damage or test the cable run for continuity issues. Keep the IP20 enclosure free from conductive dust by ensuring your main control cabinet has proper filtration.
Frequently Asked Questions (FAQs)
Q: Can I manage VLANs on the 1783-US8T?
A: No, the 1783-US8T is an unmanaged switch and does not support VLAN segmentation or any other Layer 2 management features.
Q: Can I power this switch with AC voltage?
A: Yes, the switch accepts an input range of 10-24V AC as well as 10-35V DC, providing excellent flexibility for different control panel standards.
Q: Are there any fiber optic ports on this model?
A: No, this specific model features exclusively 8 copper RJ45 ports.
Do you need more references from this brand? Explore our full catalog of Allen-Bradley here.
