Allen-Bradley 5094-AENTR FLEX 5000 EtherNet/IP Adapter

The dual-port adapter that connects a FLEX 5000 I/O island to EtherNet/IP

The Allen-Bradley 5094-AENTR is the EtherNet/IP adapter that links up to eight FLEX 5000 I/O modules to a controller. It has two RJ45 ports supporting Device Level Ring (DLR) and Parallel Redundancy Protocol (PRP) topologies, so I/O stations can be placed in rings around a plant without an external switch.

The adapter is powered from 24 V DC on a screw-type removable terminal block that ships with the unit, with spring-type RTBs available as a separate pack of five. It mounts on DIN rail and is a compact 92.7 x 94.0 x 96.5 mm.

Technical specifications

Choosing between the adapters

The AENTR supports eight modules while the 5094-AEN2TR supports sixteen, with higher power draw. In both, MOD power feeds the backplane and the adapter, while SA power is fed to the I/O bases for field circuits and should be fused to 20 A at 250 V AC as the manufacturer recommends. Variants with SFP fibre slots are separate catalog numbers.

Ordering and design points

Plan the module count and the backplane current: the adapter supplies 1130 mA at 15 V to the I/O, so check the module data (for example 80 mA for the 5094-IB16) before using the maximum number of modules. Dual ports allow linear and ring layouts, and no isolation exists between the Ethernet ports. Confirm firmware and keying with the engineering team. The adapter is open-style and needs a suitable enclosure, with temperature code T4 for hazardous-area use as printed.

This adapter supports 8 modules and draws 1250 mA of MOD power at 18 to 32 V DC, with an inrush of 3200 mA for 100 ms. If a rail needs more than 8 modules, the table for the 5094-AEN2TR lists support for 16 modules, so decide the rail length before choosing the adapter.

Where the AENTR fits in a plant network

The 5094-AENTR suits remote I/O panels that serve a single machine, skid or small process area, where eight modules cover the field signals. The panel can sit close to the equipment, shortening field wiring, while the controller stays in a central control room. Because the two RJ45 ports support DLR, several panels can be linked in a ring so that one cable break does not cut the I/O off from the controller. Where a site uses parallel redundancy, PRP support lets the adapter connect to two independent networks. Which layout to use is usually set by the plant network standard, so confirm it before the panel design is frozen.

Using several smaller islands, each with its own AENTR, can also make sense when signals are spread across a large area. Each island then serves the equipment next to it, and a fault or maintenance task in one panel leaves the others running.

Installation and commissioning considerations

As an open-style device, the adapter must be installed in an enclosure that gives the protection required for the site. Lay out the DIN rail so that the adapter, the modules and their mounting and terminal bases fit with room for wiring ducts and air flow, and check the cabinet heat load against the dissipation figure in the table. The permitted orientations give some freedom in panel layout.

During commissioning, the adapter and its modules are added to the controller project in the programming software, where electronic keying is chosen, or mechanical keying is set on the hardware. Either method helps stop a wrong module being fitted in a slot. Confirm that the MOD and SA power circuits have the recommended external protection, and size the supply for the inrush as well as the running current before energising the island.

Planning the SA power bus

SA power feeds the field side of the I/O bases. Grouping field devices into SA sections lets maintenance work on one group without switching off the whole island. Show the SA sections clearly on the panel drawings so technicians can trace a fault to the right group quickly.

Keeping the island maintainable

Leave space in the panel for the documentation and labels that maintenance teams rely on. Mark each module slot with its function and record the adapter IP address and keying choice in the panel file. When an island is later extended, these records make it quick to confirm whether the eight-module limit has been reached and whether the larger adapter would be the better choice.

How to specify your request for quotation

State the catalog number 5094-AENTR and whether the extended temperature 5094-AENTRXT is needed, along with the quantity. Say whether the mounting base, terminal base and the separately ordered screw or spring RTB packs should be quoted with the adapter. If the adapter is part of a larger FLEX 5000 project, a module list helps confirm that eight slots are enough.

Documents and quotation

The linked Rockwell Automation technical data (about 10.8 MB, hosted by Rockwell Automation) covers all FLEX 5000 I/O modules and adapters. More adapters and communication products are in Industrial Communications. To request a quotation send the catalog number and quantity to Seven Star LLC, an independent supplier in Muscat.