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Allen-Bradley 1783-USP8T | Stratix 2100 Industrial Ethernet Switch

The Allen-Bradley 1783-USP8T is an unmanaged Ethernet switch in the Stratix 2100 family. It connects Ethernet-enabled automation devices through eight 10/100 Mbps copper ports, providing straightforward Layer 2 connectivity for industrial control networks.

Its unmanaged architecture suits installations that need basic Ethernet connectivity without configuring VLANs, routing, or advanced switch-management policies. Engineers can use it to connect compatible PLCs, HMIs, engineering workstations, and other Ethernet devices within an appropriately designed control network.

Selection priority: Confirm the required port count, network speed, power input, mounting arrangement, environmental conditions, and network architecture before replacing an existing switch or specifying a new installation.

01 | Hardware Profile

Item	Specification
Manufacturer	Allen-Bradley
Product family	Stratix 2100
Catalog number	1783-USP8T
Product type	Unmanaged industrial Ethernet switch
Switching application	Layer 2 Ethernet switching
Ethernet ports	8 copper Fast Ethernet ports
Port connector	RJ45
Port speed	10/100 Mbps, 10/100Base-TX
Mounting	DIN rail
Enclosure rating	IP30
Operating temperature	−40 to +75°C, according to the manufacturer's product listing
Power supply classification	SELV/PELV; verify the permitted input voltage and wiring against the device label and applicable manual
Functional predecessor	1783-US8T

Technical note: IP30 provides protection against access to hazardous parts and solid objects of the specified size under the applicable rating conditions. It does not indicate protection against water ingress. Install the switch in a suitable enclosure when the surrounding environment requires additional protection.

02 | Eight Ports, One Practical Network Layer

The eight copper Ethernet interfaces allow multiple devices to share a local network segment. Each connected device still requires a compatible Ethernet interface, appropriate addressing, and a valid communication configuration.

• PLC connectivity: Connect compatible Ethernet-enabled controllers to the local automation network.
• HMI communication: Provide a wired Ethernet path between operator terminals and supported controllers or data sources.
• Engineering access: Connect authorized engineering workstations for controller programming, troubleshooting, and maintenance.
• Drive and equipment integration: Connect compatible Ethernet-enabled drives, machine controllers, or other automation devices when their communication requirements match the network design.
• Local device aggregation: Consolidate multiple copper Ethernet connections within a machine or control cabinet.

Fast Ethernet supports link speeds up to 100 Mbps per port. Actual application performance depends on traffic, connected-device capabilities, protocol behavior, cable quality, and the wider network topology.

03 | Application Fit: Where to Use This Switch

Installation environment	Typical role	Engineering review
PLC control cabinets	Local Ethernet connections between controllers and supported devices	Check controller communication requirements and cabinet power
Packaging and assembly machines	Connecting HMIs, controllers, and compatible machine components	Evaluate traffic demand and required network recovery behavior
Conveyor and material-handling systems	Providing local wired connectivity for automation equipment	Review cable routing, electrical noise exposure, and network layout
Industrial skids	Aggregating Ethernet links for process or auxiliary equipment	Verify temperature, enclosure protection, and supply requirements
Machine retrofit projects	Replacing an older compatible switch with a current functional alternative	Check port count, power wiring, mounting, and communication requirements
Maintenance and test panels	Connecting supported Ethernet devices during commissioning or servicing	Control network access and avoid unintended connections to production networks

Important limitation: This is an unmanaged switch. Do not select it when the application specifically requires configurable VLANs, managed traffic prioritization, advanced port diagnostics, redundant network protocols, or other managed-switch functions unless the overall design provides those capabilities elsewhere.

04 | Network Layout and Installation Checks

Correct installation starts with the intended network topology. Before mounting the switch, identify which devices require direct Ethernet connections and whether the network needs segmentation, redundancy, or managed traffic control.

1. Count the connections: Allow sufficient ports for current devices and planned expansion. Eight physical ports do not guarantee that every topology or future expansion requirement will fit.
2. Confirm link compatibility: Check the Ethernet speed and interface requirements of each connected device. Use suitable industrial Ethernet cabling and compatible RJ45 connectors.
3. Verify the power input: Read the switch nameplate and the applicable installation manual. Do not assume that every AC or DC supply listed by a third-party seller applies to every hardware version.
4. Plan the DIN rail position: Allow access to connectors, wiring, status indicators, and ventilation requirements specified by the manufacturer.
5. Separate communication and power wiring appropriately: Follow site wiring practices to reduce electrical interference and prevent cable damage.
6. Label each port: Record the connected device and cable destination. Clear labels reduce troubleshooting time when multiple devices lose communication.
7. Validate the network: Check link indicators, cable seating, device addressing, and application-level communication after energizing the installation.

05 | Field Diagnostics: Trace the Fault from Link to Application

An unmanaged switch offers simpler diagnostics than a managed switch. Engineers should use the available status indicators and systematic cable and device checks instead of expecting detailed network statistics or a configurable management interface.

Observed symptom	Likely areas to investigate	Recommended checks
No device communication after startup	Power supply, loose connections, incorrect cabling, or a device that has not started	Verify the supply against the nameplate, inspect wiring, and check each device's network interface
One port has no link indication	Damaged cable, poor connector termination, disabled device interface, or a remote device fault	Check the cable and connector, confirm the remote device is powered, and test with a known-good cable
Link is present but PLC communication fails	IP address conflict, subnet mismatch, incorrect controller configuration, or an application-level issue	Check addressing, controller configuration, device availability, and the relevant communication settings
Intermittent communication on one connection	Loose RJ45 connector, cable damage, electromagnetic interference, or an unstable remote device	Inspect cable routing and connectors; monitor the link during operation and substitute a verified cable if safe
Several devices lose communication together	Switch power interruption, a common uplink or cable issue, or a broader network fault	Check power stability, common connections, network topology, and the status of upstream equipment
Communication slows during machine operation	High traffic demand, broadcast activity, device performance, or an application bottleneck	Review connected devices and traffic sources; use suitable diagnostic tools elsewhere in the network if detailed statistics are required

Diagnostic boundary: Link status indicates a physical Ethernet connection, not successful PLC messaging. If the link is active but the application fails, continue with IP configuration, device diagnostics, controller status, and protocol-specific checks.

06 | Replacement Guidance: 1783-US8T to 1783-USP8T

Rockwell Automation identifies 1783-USP8T as the functional replacement for the discontinued 1783-US8T. The newer catalog number belongs to the Stratix 2100 family and provides eight 10/100 Mbps copper Ethernet ports.

Before ordering a replacement, confirm the following points:

• Verify that the existing unit is actually catalog number 1783-US8T and not another Stratix model.
• Compare the existing supply wiring with the replacement's permitted input requirements.
• Confirm DIN rail fit, available cabinet space, connector access, and cable routing.
• Check whether the current network depends on managed-switch functions or a special topology that an unmanaged replacement cannot provide.
• Validate device communication after installation, including controller access and any HMI or drive connections that depend on the switch.

A functional replacement designation is useful for selection, but it does not remove the need to verify the actual cabinet wiring and application requirements.

07 | Global PLC Spare HUB's Insight

For maintenance engineers, the primary benefit of the 1783-USP8T is straightforward copper Ethernet connectivity without the configuration workload associated with managed switches. This can simplify local network installation when the application does not require advanced switching features.

For a retrofit, do not diagnose every communication failure as a switch defect. A missing link may originate from the cable, remote interface, or power supply, while an active link with failed controller communication may indicate addressing or application configuration issues.

When replacing a legacy unit, record the original catalog number, power connections, port assignments, and connected-device list before removal. This record helps technicians restore the network methodically and reduces the risk of overlooking a critical connection during downtime.

Global PLC Spare HUB recommends confirming the exact model, hardware label, supply requirements, and required delivery schedule before purchase. For applications that need advanced diagnostics or network segmentation, evaluate whether a managed switch better matches the design.

08 | Warranty, Packaging, and Shipping

• Product: Allen-Bradley Stratix 2100 unmanaged Ethernet switch
• Model: 1783-USP8T
• Warranty: 12-month seller warranty, subject to the written warranty terms and coverage conditions provided with the order
• Shipping options: FedEx, UPS, and DHL, subject to destination and service availability
• Availability: Confirm current stock status and dispatch timing when requesting a quotation
• Packaging: Supplied according to the confirmed order and quotation; confirm any specific packaging requirements before purchase

Check the quotation for included accessories and documentation. Ethernet cables, power supplies, DIN rail accessories, and other installation materials should not be assumed to be included unless explicitly listed.

09 | Frequently Asked Questions

Q1: Can I use this switch to connect a PLC, HMI, and several Ethernet-enabled drives?

Potentially, provided each device supports compatible Ethernet connectivity and the total port count meets the installation requirement. Check whether the drives and controller require specific network functions, deterministic performance, or managed traffic controls. The switch provides basic connectivity but does not replace application-level configuration.

Q2: If the port indicator is on, does that confirm the PLC network is working correctly?

No. A link indicator generally confirms a physical Ethernet link, not successful communication between applications. Check device IP addresses, subnet settings, controller configuration, and the relevant communication status. If only one device fails, compare its configuration and cable with a known-working connection.

Q3: What should I check before choosing between a five-port and an eight-port switch?

Count all required connections, including PLCs, HMIs, drives, engineering access, and any uplink to another network device. Reserve capacity for foreseeable expansion where practical. Verify the exact catalog number because Stratix 2100 includes models with different port counts and interface types.

Q4: Is IP30 sufficient for a dusty or washdown production area?

IP30 does not provide water-ingress protection and offers limited protection against solid objects. For dusty, wet, or washdown environments, assess the cabinet's required ingress rating and the complete installation conditions. The enclosure, cable entries, cooling arrangement, and maintenance practices must collectively suit the environment.

Q5: What details should I send when requesting a replacement quotation?

Provide the full catalog number, quantity, photos of the nameplate, required delivery destination, and target arrival date. If replacing an installed switch, include its supply wiring details and a list of connected devices. Ask the supplier to confirm availability, warranty terms, and the shipping service before ordering.

Request a Quote

Need the Allen-Bradley 1783-USP8T Stratix 2100 unmanaged Ethernet switch for a new installation or a network replacement? Send your required quantity, delivery destination, and existing model details to request a quotation and confirm product compatibility, availability, and shipping options.

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