1734-AENT vs 1734-AENTR vs 1734-AENTK: Which POINT I/O Adapter?

By Abdullah Zahid
9 min read
Allen-Bradley 1734-AENT, 1734-AENTR and 1734-AENTK POINT I/O EtherNet/IP adapters compared side by side

1734-AENT vs 1734-AENTR vs 1734-AENTK Adapter Comparison Guide: POINT I/O EtherNet/IP Adapter, POINT I/O Dual Port EtherNet/IP Adapter, and Conformal-Coated Variant

Choosing between the 1734-AENT, 1734-AENTR, and 1734-AENTK comes down to four things: network topology, POINTBus current, direct-connection requirements, and environmental conditions. All three connect 1734-series POINT I/O to Logix controllers over EtherNet/IP, but they differ enough that the wrong choice can force a network redesign, additional power supplies, or a different adapter later.

The 1734-AENT is the single-port, non-DLR option with approximately 1.0 A of POINTBus current. The 1734-AENTR adds dual Ethernet ports, Device-Level Ring support, and a higher direct-connection ceiling for standard I/O. The 1734-AENTK, catalogued as 1734-AENTRK in Rockwell literature, follows the AENTR architecture but adds conformal coating for more demanding environments.

LeadTime.ca can confirm current availability for the exact adapter selected and supports worldwide sourcing.

Which POINT I/O Adapter Should You Choose?

Use 1734-AENT when DLR is not required and the extra POINTBus current is useful. Use 1734-AENTR when DLR or dual-port flexibility matters. Use 1734-AENTK when you need the AENTR network capabilities plus conformal coating.

  • 1734-AENT: best for simple non-DLR nodes, single Ethernet drops, and applications where approximately 1.0 A of POINTBus current is useful
  • 1734-AENTR: best for linear or DLR networks and nodes requiring up to 31 direct connections for standard I/O
  • 1734-AENTK: best for DLR-capable nodes installed where conformal coating is required

If safety modules are present, apply the lower limit of up to 20 direct connections regardless of adapter.

On this page:

1734-AENT vs 1734-AENTR vs 1734-AENTK at a Glance

Feature 1734-AENT 1734-AENTR 1734-AENTK
EtherNet/IP ports 1 2 2
DLR support No Yes Yes
Max POINT I/O modules Up to 63 with expansion power supplies Up to 63 Up to 63
POINTBus current Approx. 1.0 A Approx. 0.8 A Approx. 0.8 A
Rack-optimized connections Up to 5 Up to 5 Up to 5
Direct connections, standard I/O Up to 20 Up to 31 Up to 31
Direct connections with safety I/O Up to 20 Up to 20 Up to 20
Nominal input voltage 24 V DC, 10–28.8 V DC range 24 V DC, 10–28.8 V DC range Same as 1734-AENTR
Environmental version Standard Standard Conformal coated

The key trade-off is straightforward: 1734-AENT provides more POINTBus current, while 1734-AENTR and 1734-AENTK provide DLR and more direct connections for standard I/O.

What the POINT I/O Adapter Does

The 1734-AENT, 1734-AENTR, and 1734-AENTK act as the EtherNet/IP interface between Logix controllers and 1734-series POINT I/O modules. They can be used in CompactLogix, ControlLogix, or PlantPAx systems for machine-level and line-level distributed I/O.

All three can support up to 63 POINT I/O modules per node when expansion power supplies are used and POINTBus current is correctly managed. The adapter choice therefore affects how the node is networked and powered, not just how it connects physically to the controller.

Single-Port vs Dual-Port DLR

Network topology is the first filter. If the plant requires Device-Level Ring, 1734-AENT is not suitable.

Network Aspect 1734-AENT 1734-AENTR 1734-AENTK
Ports Single port Dual port Dual port
DLR No Yes Yes
Typical topology Star, tree, or linear through external infrastructure Linear or DLR Linear or DLR
Typical role Simple machine node DLR-capable line or machine node DLR node requiring conformal coating

The 1734-AENT relies on external network infrastructure for branching or redundancy. The 1734-AENTR and 1734-AENTK provide two Ethernet ports and can participate in DLR architectures.

The dual ports should not be treated as a generic unmanaged switch. Use them according to the intended linear or DLR architecture.

POINTBus Current and Module Capacity

The 1734-AENT provides approximately 1.0 A of POINTBus current, while 1734-AENTR and 1734-AENTK provide approximately 0.8 A. That 0.2 A difference can matter on nodes with dense analog or specialty-module loads.

Criterion 1734-AENT 1734-AENTR 1734-AENTK
POINTBus current Approx. 1.0 A Approx. 0.8 A Approx. 0.8 A
Maximum node size Up to 63 modules with expansion power Up to 63 modules Up to 63 modules

The maximum module count does not mean the adapter can power any 63-module combination directly. Calculate the current consumption of every planned module and add expansion power supplies where required.

If DLR is unnecessary and POINTBus load is the tighter design constraint, the 1734-AENT can be the better choice.

Direct and Rack-Optimized Connection Limits

All three adapters support up to 5 rack-optimized connections for digital modules. The larger difference is the direct-connection ceiling.

Connection Type 1734-AENT 1734-AENTR 1734-AENTK
Rack-optimized Up to 5 Up to 5 Up to 5
Direct, standard I/O Up to 20 Up to 31 Up to 31
Direct, safety present Up to 20 Up to 20 Up to 20

Rack-optimized connections can combine several digital modules into fewer controller connections. Analog, specialty, and safety modules may require direct connections.

For standard I/O, AENTR and AENTK provide more direct-connection capacity. Once safety modules are added, design around the 20-connection limit.

When the 1734-AENTK Makes Sense

The 1734-AENTK, catalogued as 1734-AENTRK in Rockwell literature, is the conformal-coated dual-port variant. Its network role is similar to 1734-AENTR, but it is intended for installations where environmental conditions justify coated electronics.

Aspect 1734-AENT 1734-AENTR 1734-AENTK
Environmental version Standard Standard Conformal coated
Mounting DIN rail DIN rail DIN rail
Typical use Controlled panel Standard industrial panel Higher humidity, contaminants, or aggressive cleaning within POINT I/O limits

Choose the coated variant because the installation requires it, not simply because it is a higher-suffix model. The supplied research does not establish exact environmental limits beyond the conformal-coating distinction.

Safety I/O Design Considerations

Safety I/O changes the connection calculation. Although 1734-AENTR and 1734-AENTK support up to 31 direct connections for standard I/O, the limit falls to up to 20 when any safety module is present.

For mixed safety and standard nodes, select the adapter first by topology and POINTBus current, then calculate the node using the safety-specific connection ceiling.

  • Use 1734-AENTR or 1734-AENTK when DLR is required
  • Use 1734-AENT when DLR is not required and the higher POINTBus current is useful
  • Consider separate safety nodes where connection planning becomes restrictive

Best Adapter by Project Scenario

Project Scenario Recommended Adapter Reason
Simple machine node, no DLR 1734-AENT Single-port design and approx. 1.0 A POINTBus current
Plant using DLR 1734-AENTR Dual-port DLR support and up to 31 direct connections for standard I/O
DLR node in harsher environment 1734-AENTK DLR capability plus conformal coating
Mixed standard and safety I/O Scenario-dependent All three are limited to up to 20 direct connections with safety present
Plant-wide standardization Often 1734-AENTR, with AENTK used selectively AENTR covers linear and DLR nodes; AENTK covers coated applications

For most projects, topology decides the adapter first. POINTBus load and direct connections then confirm whether the initial choice still works.

What Engineers Report in the Field

Community discussion around these adapters is generally positive. Most problems come from selection or network design rather than basic adapter reliability.

1734-AENT is valued for simplicity but is sometimes selected before a later DLR requirement is considered. 1734-AENTR is often treated as the flexible default because it works in linear and ring architectures, although engineers report confusion around DLR wiring and the lower POINTBus current compared with AENT.

The 1734-AENTK is more specialized. Engineers value the conformal coating where environmental exposure is a concern, but the brief notes that availability can be less predictable than for the mainstream variants.

Plant Standardization: AENT vs AENTR

An AENT-only standard works where the facility does not use DLR and values the approximately 1.0 A POINTBus output. An AENTR-based standard gives more network flexibility because the same adapter can support linear and DLR nodes.

The trade-off is that AENTR provides approximately 0.8 A of POINTBus current. Plants standardizing on AENTR should therefore continue to calculate module current rather than assuming one adapter standard fits every node without additional power.

A practical mixed standard is to use AENTR for general DLR-capable nodes, retain AENT where its higher POINTBus current or simpler topology is preferred, and reserve AENTK for locations requiring conformal coating.

Common Selection Mistakes

Choosing 1734-AENT for a DLR Network

1734-AENT does not support DLR. If ring topology is mandatory, choose 1734-AENTR or 1734-AENTK.

Ignoring POINTBus Current

AENT provides approximately 1.0 A, while AENTR and AENTK provide approximately 0.8 A. Dense analog and specialty-module nodes may therefore require different power planning.

Assuming AENTR Always Supports 31 Direct Connections

The 31-connection figure applies to standard I/O. With safety modules present, the limit is up to 20.

Treating Dual Ports as a Generic Switch

The two ports on AENTR and AENTK are intended for their supported linear and DLR architectures. Arbitrary branching can create topology problems.

Ignoring the Environment

If the panel is exposed to higher humidity, contaminants, or aggressive cleaning practices, evaluate whether the conformal-coated AENTK is required.

Wrong-Part Prevention Checklist

  1. Confirm whether the line or plant standard requires DLR ring topology; do not choose 1734-AENT if DLR is mandatory.
  2. Calculate total POINTBus current draw for all planned modules; verify against 1.0 A (AENT) vs 0.8 A (AENTR/AENTK).
  3. Count expected direct EtherNet/IP connections from the Logix controller to this node; ensure they fit within adapter limits (AENT vs AENTR/AENTK).
  4. Identify any safety I/O modules on the node; apply the lower direct-connection limits where safety modules are present.
  5. Evaluate environmental contaminants (chemical, moisture, dust) and cleaning practices; choose AENTK if conformal coating is needed.
  6. Check available Ethernet ports and cabling practices in the panel; dual-port adapters are not generic switches and must be used as designed.
  7. Validate firmware and Studio 5000 support versions across all three options before ordering.

If one of these checks is unresolved, the adapter selection is not ready for procurement.

Expert Verdict

Choose 1734-AENT for straightforward non-DLR nodes where a single Ethernet connection is sufficient and approximately 1.0 A of POINTBus current is useful. Its up to 20 direct connections also make it a good fit for smaller or moderate-complexity nodes that do not need the additional networking flexibility of AENTR.

Choose 1734-AENTR when DLR is required, may be added later, or the node benefits from up to 31 direct connections for standard I/O. Choose 1734-AENTK when those same dual-port and DLR requirements apply but the installation also calls for conformal-coated electronics.

The deciding question is not which adapter is newer or more capable overall. It is whether the node needs DLR, approximately 1.0 A versus 0.8 A of POINTBus current, more than 20 standard direct connections, safety I/O, or conformal coating. Once those requirements are known, LeadTime.ca can confirm current availability for the selected catalogue number and support worldwide sourcing.

Frequently Asked Questions

Does 1734-AENT support Device-Level Ring?

No. 1734-AENT is the single-port option and does not support DLR. Use 1734-AENTR or 1734-AENTK for DLR nodes.

Can 1734-AENTR be used without DLR?

Yes. It supports linear as well as Device-Level Ring architectures, which is why it can work as a broader plant standard.

What is the biggest difference between 1734-AENT and 1734-AENTR?

1734-AENT has one port, no DLR, approximately 1.0 A POINTBus current, and up to 20 direct connections. 1734-AENTR has two ports, DLR, approximately 0.8 A, and up to 31 direct connections for standard I/O.

How is 1734-AENTK different from 1734-AENTR?

1734-AENTK, catalogued as 1734-AENTRK in Rockwell literature, is the conformal-coated dual-port DLR variant. Its main distinguishing factor in the supplied brief is environmental protection.

How many POINT I/O modules can these adapters support?

All three can support up to 63 POINT I/O modules per node when expansion power supplies are used and POINTBus current limits are respected.

Which adapter has the most POINTBus current?

1734-AENT provides approximately 1.0 A. 1734-AENTR and 1734-AENTK provide approximately 0.8 A.

How many direct connections can 1734-AENTR support?

Up to 31 for standard I/O. If any safety module is present, the limit becomes up to 20.

When should I choose 1734-AENTK?

Choose it when you need the dual-port DLR capabilities of AENTR and the installation also requires conformal-coated electronics because of environmental exposure.

Why Source Through LeadTime.ca

  • Support for 1734-AENT, 1734-AENTR, and 1734-AENTK sourcing
  • Worldwide shipping
  • Current availability confirmation before procurement
  • Support for volume and multi-node requirements
  • Availability checks for specialist variants such as 1734-AENTK

At-a-Glance Summary

  • 1734-AENT: 1 port, no DLR, approx. 1.0 A POINTBus current, up to 20 direct connections
  • 1734-AENTR: 2 ports, DLR, approx. 0.8 A POINTBus current, up to 31 direct connections for standard I/O
  • 1734-AENTK: 2 ports, DLR, approx. 0.8 A POINTBus current, conformal coated
  • All three support up to 63 POINT I/O modules with appropriate expansion power
  • All three support up to 5 rack-optimized connections
  • All three are limited to up to 20 direct connections when safety I/O is present
  • Use AENT for simple non-DLR nodes, AENTR for general DLR applications, and AENTK where DLR and conformal coating are both required

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