Allen-Bradley 1783-US5T Stratix 2000 5-Port Ethernet Switch

A compact five-port industrial switch

The Allen-Bradley 1783-US5T is a Stratix 2000 unmanaged Ethernet switch with five 10/100 Mbps RJ45 ports. It is the smallest of the Stratix 2000 series B range and is meant for connecting a few controllers, drives, HMIs and I/O adapters inside a panel without any configuration. Rockwell Automation lists the series as ODVA conformance tested to the EtherNet/IP specifications.

The switch has no SFP slots. If you need fibre uplinks, the same technical data shows other Stratix 2000 catalog numbers with preinstalled fibre modules or with open SFP slots.

Technical specifications

Power, mounting and clearances

The switch takes a SELV supply of 12 to 48V DC or 18 to 30V AC, 50/60 Hz. Maximum power consumption is 3.4 W with an inrush current of 1.85 A. Wire the power terminals with 0.25 to 4 mm² (24 to 12 AWG) twisted-pair copper wire, tightened to 0.50 to 0.56 N•m. The unit is mounted on a 35 mm DIN rail and is grounded through that rail, so the instructions call for a zinc-plated yellow-chromate steel rail, plus a 2.5 mm² (14 AWG) ground wire to the ground screw if needed.

To avoid overheating, keep 51 mm clear above, below and at the sides, and 64 mm in front. The enclosure rating is IP30, so the switch belongs in a cabinet.

Temperature range and approvals

Rockwell certifies the 1783-US5T series B for a surrounding air temperature of -10 to +60 °C only, a narrower range than the extended -40 to +75 °C of the Gigabit and fibre models. The printed approvals include cULus Class I Division 2, CE, RCM, ATEX and IECEx Zone 2, KC and BSMI, with T4 temperature codes.

Is a five-port unmanaged switch the right choice?

The 1783-US5T suits small, self-contained machine networks where a handful of EtherNet/IP devices share one cabinet and no traffic segmentation is needed. Before selecting it, count the devices that will connect today, add the ports that maintenance staff will need for a laptop during troubleshooting, and leave room for at least one future device. If the count already fills all five ports, a larger switch from the same family is usually the better long-term answer.

Also think about traffic. An unmanaged switch forwards multicast traffic to every port, so a network with many I/O connections using multicast, or one that links into a large plant network, may need a managed switch with features such as IGMP snooping. Discuss the network design with the controls engineer if there is any doubt.

Installing in the panel

Clip the switch onto a grounded DIN rail section, respecting the clearances given above, and keep it away from heat sources such as power supplies and drives in the same cabinet. Use shielded or industrial-grade Ethernet patch cables where the panel contains variable-speed drives, and separate network cables from power wiring as far as the panel layout allows. Tighten the power terminals to the stated torque and confirm that the ground path through the rail is sound before switching on.

Commissioning the network

Power up the switch with no devices connected and confirm that it starts normally. Then connect the controller, followed by drives, HMIs and I/O adapters, checking each one in the programming software as it comes online. Watch for duplicate IP addresses, which are a common issue when spare devices with factory or old settings are added. Finally, check the connection count and update rates in the controller so that the network load is understood before the machine goes into production.

Cabinet conditions in Oman and the GCC

The narrower -10 to +60 °C range of this model makes the cabinet temperature an important check in Gulf installations. Control panels on outdoor skids, pump stations and rooftop units can heat up quickly in summer sun, so measure the air inside the enclosure near the switch at the hottest time of day. Where the reading comes close to the limit, add shading, ventilation or cooling to the cabinet. Keep panel doors closed and seals in good condition to reduce fine dust, and avoid condensation in humid coastal plants by keeping cooled panels sealed and correctly drained.

Maintenance

Include the switch in routine panel inspections: check that the patch cables are still fully seated, look for heat discolouration around the power terminals, and clear dust from the cabinet filters. Keep a port map in the panel documents so that a replacement unit can be installed quickly.

Documents and quotation

The Rockwell Automation Stratix 2000 installation instructions are attached; the specification table comes from publication 1783-TD002. See our industrial communications catalogue for related adapters and switches. Confirm the exact catalog number, series letter and firmware or hardware revision on the product label, and the compatibility with your existing system, before ordering. Stock and lead time are confirmed at quotation.