Allen-Bradley 1734-AENTRK — Conformal Coated POINT I/O Adapter Guide

By Abdullah Zahid
16 min read
Allen-Bradley 1734-AENTRK conformal coated 2-port EtherNet/IP POINT I/O adapter for harsh industrial environments

Allen-Bradley 1734-AENTRK POINT I/O 2 Port EtherNet/IP Adapter, Conformal Coated — Specs, Review and Buying Guide

Controls engineers specifying distributed I/O for a Rockwell Logix system face a specific fork in the road when selecting a POINT I/O EtherNet/IP adapter: single or dual port, coated or standard. The Allen-Bradley 1734-AENTRK answers both questions at once — it delivers two 10/100 Mbps EtherNet/IP ports for Device Level Ring or daisy-chain topologies, and it carries conformal coating for reliability in corrosive, humid, or contaminated panel environments. With backplane support for up to 63 POINT I/O modules and 0.8 A backplane current output, this adapter sits at the top of the POINT I/O adapter family in terms of environmental protection.

If you have already confirmed this is the right part for your application, check current pricing and availability for the 1734-AENTRK at LeadTime.ca — we ship worldwide.

Who Should Buy the 1734-AENTRK — and Who Should Choose a Different Variant

The 1734-AENTRK is the correct adapter when your application satisfies all of the following criteria:

  • Your network uses EtherNet/IP and CIP — not DeviceNet, Profibus, Profinet, or another fieldbus.
  • Your topology requires two Ethernet ports for Device Level Ring or linear daisy-chain network resilience.
  • Your panel or enclosure is exposed to corrosive gases, condensation risk, elevated humidity, or airborne contamination that would degrade an uncoated PCB over time.
  • Your POINT I/O stack stays within the 63-module maximum and within the 0.8 A backplane current budget.
  • Your Logix controller model and Studio 5000 or RSLogix 5000 firmware revision support the specific series and firmware of the 1734-AENTRK you are ordering.

If your environment is clean and temperature-controlled and conformal coating is not a requirement, the lower-cost 1734-AENTR is typically the better economic choice. If you only need a single Ethernet port in a simple star topology, the 1734-AENT removes cost and complexity. For on-machine or IP67 applications that do not use cabinet-mounted I/O, the ArmorPOINT 1738-AENTR is the appropriate platform instead.

On this page:

What the 1734-AENTRK Does in a POINT I/O System

The 1734-AENTRK is the communication coupler between a Logix controller — ControlLogix, CompactLogix, or any EtherNet/IP-capable Logix family member — and a stack of POINT I/O modules mounted on the backplane. It is always the first physical module in the POINT I/O assembly; every I/O module behind it draws backplane power and receives CIP connection management through this adapter. Without it, the downstream I/O modules have no network identity and no path to the controller.

The conformal coating applied in the 1734-AENTRK variant — indicated by the K suffix — is the distinguishing feature versus the functionally identical 1734-AENTR. Both deliver two 10/100 Mbps EtherNet/IP ports, the same 0.8 A backplane current output, and the same support for up to 63 POINT I/O modules. The coating adds resistance to corrosive gases, moisture, and airborne contamination that would otherwise attack the bare PCB surfaces of the standard variant over time.

The dual-port architecture enables three network topologies beyond a simple star connection to a managed switch: linear daisy-chain, tree, and Device Level Ring. DLR is particularly valuable on production lines where a single cable cut or connector failure in a standard linear run would drop the entire I/O stack — with DLR properly configured, the ring heals in milliseconds and I/O communication continues uninterrupted.

Typical System Architecture for POINT I/O EtherNet/IP Networks

The 1734-AENTRK sits in the middle of the data and power chain — downstream from the Logix controller and the plant EtherNet/IP infrastructure, and upstream from every POINT I/O module on its backplane. Here is how a typical deployment is layered:

  • ControlLogix or CompactLogix controller on the EtherNet/IP plant network, running the Logix project in Studio 5000.
  • Managed industrial Ethernet switch or direct EtherNet/IP segment connecting the controller to the 1734-AENTRK's Port 1 (and Port 2 for ring or daisy-chain continuation).
  • 1734-AENTRK mounted first on the DIN rail, providing the backplane power bus (0.8 A available) and CIP network presence for the entire I/O stack.
  • POINT I/O terminal bases and I/O modules installed in slot order behind the adapter — digital, analog, or specialty modules up to the 63-module and current budget limits.
  • Terminating base installed at the far end of the POINT I/O stack to complete the backplane assembly.

Where the 1734-AENTRK Is Actually Deployed

Packaging machinery in food and beverage facilities is one of the most common homes for the 1734-AENTRK. Control panels in these environments are regularly exposed to cleaning agents, steam, and high humidity. The conformal coating guards the adapter against the corrosive agents that cause premature failure in uncoated electronics, and the dual-port DLR topology keeps the I/O network live even when a cable is disturbed during a washdown cycle.

Automotive assembly and general manufacturing plants with welding fumes, metalworking fluid mist, or heavy dust loads also benefit from the K variant. These environments may not expose the panel to direct liquid spray, but corrosive airborne particles accumulate on PCBs over months and years. Specifying conformal coating at the design stage avoids a difficult mid-life replacement.

Retrofit projects converting older DeviceNet or Remote I/O installations to EtherNet/IP are a strong use case for the entire POINT I/O family. The 1734-AENTRK gives the retrofitted cabinet a modern, dual-port EtherNet/IP gateway that integrates directly with the existing Logix infrastructure, often reusing the same DIN rail and enclosure footprint.

Oil and gas skid panels, water and wastewater pump stations, and mining installations represent applications where the panel location is inherently difficult — outdoor-facing, process-adjacent, or poorly climate-controlled. In these cases the incremental cost of the K suffix is a straightforward reliability investment against the downtime cost of an adapter failure in a remote or hazardous location.

Application Typical Deployment
Food and beverage packaging line 1734-AENTRK in DLR ring topology, panel adjacent to washdown zone
Automotive body shop or welding cell Conformal-coated adapter protecting I/O from weld spatter fumes and metallic dust
Legacy DeviceNet or RIO retrofit POINT I/O stack replacing older distributed I/O, reusing existing enclosure and DIN rail
Oil and gas skid or pump station Compact POINT I/O stack in outdoor-facing panel, dual-port for network resilience
OEM machine with tight panel space Modular POINT I/O stack reducing wiring and footprint, EtherNet/IP to CompactLogix
Water and wastewater treatment 1734-AENTRK in high-humidity environment, linear daisy-chain through multiple panels

Key Specifications and Variant Comparison for the 1734-AENTRK

Parameter 1734-AENTRK Value
Catalog number 1734-AENTRK
Product family POINT I/O 2 Port EtherNet/IP Adapter
Network protocol EtherNet/IP, CIP
Ethernet ports 2 x RJ45, 10/100 Mbps
Supported topologies Star, linear, tree, Device Level Ring
Input voltage 24 V DC nominal
Backplane current output 0.8 A
Maximum POINT I/O modules Up to 63 modules (subject to current and connection limits)
Conformal coating Yes (K-suffix variant)
Operating temperature -20 °C to 55 °C (verify against current datasheet for your series)

Full technical specifications are available on the product page at LeadTime.ca.

The table below separates the three core POINT I/O EtherNet/IP adapter variants so you can quickly confirm the right catalog number for your design:

Model Ethernet Ports Topologies Supported Conformal Coating Best Fit
1734-AENT 1 x RJ45 Star only No Simple star topology in clean environment, lowest cost
1734-AENTR 2 x RJ45 Star, linear, tree, DLR No Dual-port / DLR in controlled, clean panel environments
1734-AENTRK 2 x RJ45 Star, linear, tree, DLR Yes Dual-port / DLR in harsh, humid, or corrosive environments
1738-AENTR 2 x RJ45 Star, linear, tree, DLR N/A (IP67 rated) On-machine ArmorPOINT I/O — not cabinet-mounted POINT I/O

If your application requires dual-port DLR capability and the panel will see any exposure to corrosive gases, humidity, or contamination, the 1734-AENTRK is the correct selection — check current stock and availability at LeadTime.ca.

Expert Verdict: Is the 1734-AENTRK Worth the Premium Over 1734-AENTR?

The 1734-AENTRK is the right choice for controls engineers and OEM machine designers who are committed to the POINT I/O platform, need Device Level Ring or linear daisy-chain topology for network resilience, and are placing panels in environments where corrosive gases, condensation, humidity, or airborne contamination are realistic threats. The adapter functions identically to the well-proven 1734-AENTR — same dual 10/100 Mbps EtherNet/IP ports, same 0.8 A backplane current budget, same 63-module capacity — but the conformal coating buys meaningful protection against the slow PCB degradation that turns a reliable system into an intermittent troubleshooting problem over a multi-year service life. For packaging plants near washdown zones, process panels in oil and gas facilities, or any enclosure where ambient corrosion is a credible failure mode, the incremental cost of the K suffix is a straightforward reliability decision.

Where the 1734-AENTRK is not the right call: clean, air-conditioned control rooms and standard machine enclosures that will never see condensation or chemical exposure. In those environments, the 1734-AENTR delivers exactly the same dual-port EtherNet/IP performance at lower cost and typically better stock availability. If your topology is genuinely star-only — no ring, no daisy-chain — the single-port 1734-AENT removes cost and complexity without any performance penalty. And if the application is on-machine with IP67 requirements, the ArmorPOINT 1738-AENTR is the correct platform entirely; POINT I/O is a cabinet-mounted system and should not be used as an on-machine alternative.

From a procurement standpoint, conformal-coated variants can carry longer or more variable lead times than their standard counterparts, and availability fluctuates with demand cycles. Working with a specialist distributor who can verify current stock, provide realistic lead-time commitments, and flag substitution options before you finalize a build schedule is a real practical advantage — particularly when a panel build is on a critical path. You can view current pricing and availability for the 1734-AENTRK at LeadTime.ca or contact the team to confirm lead time against your project schedule.

For volume pricing or to confirm lead time before committing to a build, contact the LeadTime.ca team directly — we ship worldwide.

What Engineers Are Saying About the 1734-AENTR Family

Community discussion across forums including PLCTalk, Reddit r/PLC, PLCS.net, and MrPLC is concentrated on the 1734-AENTR, but the feedback applies directly to the 1734-AENTRK since the two parts are functionally identical — the K suffix adds conformal coating and nothing else changes about how the adapter behaves on the network or on the backplane. The consistent praise from engineers who have deployed these adapters is that Studio 5000 integration is genuinely smooth once the adapter is configured correctly, with clean EDS handling and straightforward I/O tree management. The compact POINT I/O form factor combined with the dual-port adapter is regularly cited as a real panel space and wiring time saver compared to older distributed I/O platforms. When Device Level Ring is properly designed and the ring supervisor is correctly configured, engineers report that the dual-port adapter handles single-point network faults gracefully — the ring heals and I/O communication continues without controller intervention.

The complaints that come up repeatedly are worth taking seriously, because they point to specific design and commissioning discipline requirements rather than product defects. Intermittent network issues in poorly planned daisy-chain or DLR topologies — particularly when mixed third-party switches are involved — are a recurring thread. The root cause is usually inadequate network design rather than adapter failure, but the 1734-AENTR and 1734-AENTRK tend to surface the problem more visibly than a managed switch port would. Backplane overload is the other common failure mode: engineers report puzzling I/O behavior that eventually traces back to exceeding either the 0.8 A backplane current budget or the CIP connection count limit. Both are calculable during design, but are easy to overlook when I/O modules are added incrementally over time. Firmware and EDS mismatch issues surface when a newer series of adapter is installed into an older Logix project that was built against an earlier revision — the adapter appears in the I/O tree but generates faults until the catalog entry is updated to match the physical hardware.

Ordering mistakes reported in the community follow a clear pattern. The most common is specifying 1734-AENT — the single-port variant — when the design required a ring or daisy-chain topology, forcing a last-minute hardware change. The second is ordering 1734-AENTR in applications where the environment later proved to warrant conformal coating, resulting in premature adapter failure and an avoidable replacement exercise. The third mistake is completing the adapter order without including the correct POINT I/O terminal bases and the required terminating base, leaving the commissioning team unable to complete the backplane assembly. All three of these are preventable with a deliberate pre-order checklist — which is exactly what the Wrong-Part Prevention section below is designed to support.

Wiring and Installation Overview for the 1734-AENTRK

The following is an overview of the key physical and electrical requirements. Full wiring diagrams, terminal assignments, and step-by-step commissioning procedures are contained in Rockwell Automation's official installation instructions and user manual for the 1734-AENTRK.

  • The 1734-AENTRK must be the first module in the POINT I/O backplane assembly; install it on the DIN rail first, then build the terminal base and I/O module stack behind it, ending with the terminating base to complete the backplane.
  • Supply 24 V DC nominal to the adapter's terminal base; provide external overcurrent protection (fuses or circuit breakers) on the 24 V DC supply line as required by the installation manual — the adapter does not include internal protection.
  • Connect Ethernet cables to the two RJ45 ports according to your planned topology — Port 1 to the upstream switch or ring entry point, Port 2 to the next device in a linear or ring configuration; use industrial-rated Ethernet cables and physically separate low-voltage signal cables from high-voltage conductors.
  • Assign an IP address before network connection using the adapter's rotary switches, a BOOTP/DHCP server, or static configuration via software tools, consistent with plant addressing standards.
  • After power-up, verify LED indicators for normal operating status — module status, network status, and link activity LEDs should all confirm healthy operation before downloading the Logix project and placing the controller in run mode.

Compatible POINT I/O Modules and System Expansion

The 1734-AENTRK supports the full range of POINT I/O modules available in the 1734 product family. The modules listed below represent the major categories that are typically deployed behind this adapter. Confirm individual module compatibility and current draw against your specific BOM and the 0.8 A backplane current budget before finalizing the design.

  • 1734-IB8 / 1734-OB8 — 8-channel 24 V DC digital input and output modules, the most common building blocks of a POINT I/O stack.
  • 1734-IE4C / 1734-OE4C — 4-channel analog current input and output modules for process signals.
  • 1734-IE4S / 1734-OE4S — 4-channel analog voltage input and output modules.
  • 1734-SSI — Synchronous Serial Interface specialty module for encoder or absolute position feedback.
  • 1734-TOPS / 1734-TOPNPN — Overload protection module for motor starter applications within the POINT I/O stack.
  • 1734-EP24DC — Expansion power supply for POINT I/O, used when the backplane current demand of the module stack exceeds what the adapter's 0.8 A output can support alone.
  • 1734-TB / 1734-TBS — Standard and spring-clamp terminal bases required for every POINT I/O module; these must be ordered separately and are frequently missed in initial BOMs.

Wrong-Part Prevention Checklist Before You Order the 1734-AENTRK

Review every item on this checklist before finalizing your purchase order. These checks prevent the most common and costly ordering mistakes associated with the POINT I/O EtherNet/IP adapter family.

  1. Confirm EtherNet/IP is the required fieldbus (not DeviceNet, Profibus, Profinet, etc.).
  2. Verify that conformal coating is needed; otherwise, consider 1734-AENTR for cost savings.
  3. Check that your design does not exceed the maximum POINT I/O module count and backplane current of this adapter.
  4. Ensure Logix CPU and Studio 5000 / RSLogix 5000 firmware support the specific series/firmware of 1734-AENTRK.
  5. Verify you have ordered the correct POINT I/O terminal bases and backplane power supplies for your I/O modules.
  6. Confirm that your network design uses supported topologies (star, linear, ring) and that Device Level Ring is configured correctly if used.

If any item on this checklist is uncertain, contact the LeadTime.ca team before ordering — our specialists can cross-check your I/O count, environment rating, firmware version, and topology against your specific application to confirm the 1734-AENTRK is the correct part on your BOM.

Frequently Asked Questions

How many POINT I/O modules can I connect behind one 1734-AENTRK before hitting a hard limit?

The physical backplane maximum is 63 POINT I/O modules per adapter. However, the practical limit is usually reached earlier, either through the 0.8 A backplane current budget — which is consumed at different rates by different module types — or through the CIP connection count limit enforced by the adapter's firmware. Calculate both current draw and connection count during design, and use the 1734-EP24DC expansion power supply to extend the current budget if required. If connection limits are being approached, switching from direct connections to rack-optimized connections reduces the per-module connection overhead significantly.

Can I use the 1734-AENTRK as a Device Level Ring node with managed switches, and what do I need to configure?

Yes, the 1734-AENTRK supports Device Level Ring topology through its dual 10/100 Mbps EtherNet/IP ports. For a DLR ring to function correctly, a ring supervisor must be designated — this is typically handled by the Logix controller or a managed switch with DLR supervisor capability. The adapter itself participates as a ring node. Follow Rockwell Automation's DLR configuration guidance in the adapter user manual and validate ring health during commissioning before the system goes into production. Mixed third-party switches without proper DLR support can cause intermittent ring behavior; verify switch compatibility before committing to the topology design.

What is the actual difference between 1734-AENTR and 1734-AENTRK, and when is the conformal coating genuinely worth the extra cost?

Functionally, the two parts are identical — same dual 10/100 Mbps ports, same 0.8 A backplane current, same 63-module capacity, same topology support. The K suffix denotes conformal coating applied to the PCB and components to resist corrosive gases, moisture, and airborne contamination. The coating is worth specifying when the panel is located near washdown zones, process areas with chemical vapors, high-humidity environments, or outdoor-facing installations where condensation is a credible risk. In clean, air-conditioned control rooms the standard 1734-AENTR is sufficient and typically more readily available.

Which firmware and Studio 5000 version do I need to support a newly sourced 1734-AENTRK?

Rockwell Automation releases compatibility information by adapter series and firmware revision in the product release notes and the Rockwell Automation Compatibility and Download Center. If you are installing a new-series 1734-AENTRK into an older Logix project, the Studio 5000 catalog entry must match the adapter's series and firmware revision exactly — a mismatch will generate controller faults even though the adapter appears in the I/O tree. Verify the adapter's series label against the catalog entry in your project before download, and update Studio 5000 and controller firmware if the current project version does not include support for the new series.

Can I directly replace a failed 1734-AENTR in an existing stack with a 1734-AENTRK without rewiring?

In most cases yes — the 1734-AENTRK occupies the same physical position as the first module in the POINT I/O backplane and uses the same terminal base and wiring as the 1734-AENTR. The Ethernet port positions and pinout are identical. The main commissioning step to verify is that the Logix project's catalog entry for the adapter matches the series and firmware of the replacement 1734-AENTRK unit; if the replacement is a newer series than the failed unit, update the catalog entry in Studio 5000 before downloading. Confirm IP address assignment is carried over correctly if the original unit used rotary switch addressing versus DHCP.

Does the 1734-AENTRK require any specific external power supply or protection hardware?

The adapter requires a 24 V DC nominal external power supply connected through the appropriate POINT I/O terminal base. The installation manual specifies that external overcurrent protection — fuses or circuit breakers — must be provided on the 24 V DC supply line; the adapter does not contain internal protection. The power supply must be capable of supporting the combined current draw of the adapter and all backplane-powered POINT I/O modules in the stack, respecting the 0.8 A backplane current limit from the adapter and supplementing with a 1734-EP24DC expansion supply if the stack demands more than the adapter can provide.

Why Order the 1734-AENTRK From LeadTime.ca

  • LeadTime.ca ships worldwide — whether your project is in Canada, the United States, or internationally, we fulfill orders globally and can advise on lead times before you commit to a build schedule.
  • Specialist distributors can cross-check your I/O module count, backplane current budget, firmware version, and network topology against your application before the order is placed — generic channels cannot.
  • Conformal-coated variants like the 1734-AENTRK can have variable lead times depending on demand; we provide realistic availability information and substitution options when stock is constrained.
  • Volume pricing is available — contact the team for project quantities or repeat BOM orders.
  • We help prevent the common part-number mistakes that result in wrong variants arriving on-site: single-port versus dual-port, coated versus standard, POINT I/O versus ArmorPOINT.

At-a-Glance Summary

  • The Allen-Bradley 1734-AENTRK is a conformal-coated, dual-port EtherNet/IP adapter for the POINT I/O platform, identified by the K suffix that distinguishes it from the standard 1734-AENTR.
  • Two 10/100 Mbps RJ45 EtherNet/IP ports support star, linear, tree, and Device Level Ring topologies — ring topology requires correct DLR supervisor configuration.
  • Backplane current output is 0.8 A; maximum supported POINT I/O modules per adapter is 63, subject to both current budget and CIP connection limits.
  • Input voltage is 24 V DC nominal; external overcurrent protection on the supply line is mandatory per installation instructions.
  • Operating temperature range is -20 °C to 55 °C — confirm against the current Rockwell datasheet for your specific series.
  • Conformal coating provides enhanced resistance to corrosive gases, humidity, and contamination versus the uncoated 1734-AENTR.
  • Compatible with ControlLogix, CompactLogix, and other EtherNet/IP Logix controllers; firmware and series compatibility must be verified against your Studio 5000 or RSLogix 5000 project version.
  • For on-machine IP67 applications, the correct platform is ArmorPOINT 1738-AENTR — not 1734-AENTRK.
  • Pricing is available on the product page; conformal-coated variants typically carry a cost premium and potentially longer lead times versus the standard 1734-AENTR.
  • LeadTime.ca ships the 1734-AENTRK worldwide — contact for volume pricing, lead time confirmation, or pre-order technical support.

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