Allen-Bradley 1738-AENTR – ArmorPoint EtherNet/IP Dual Port Adaptor | ArmorPoint I/O Platform
Engineering Background: The Allen-Bradley 1738-AENTR is a purpose-built EtherNet/IP communication adaptor for the ArmorPoint I/O system, designed by Rockwell Automation to deliver deterministic, high-speed I/O data exchange in harsh industrial environments. Its dual-port topology enables Device Level Ring (DLR) network redundancy — a critical requirement for continuous-process and safety-critical applications where network downtime is unacceptable.
Product Positioning: The 1738-AENTR serves as the communication gateway between the EtherNet/IP network and the ArmorPoint I/O node. It is the preferred adaptor for engineers deploying distributed I/O in IP67-rated enclosures on the plant floor, eliminating the need for control panel enclosures and reducing installation costs in wet, dusty, or chemically aggressive environments.
Complete Technical Specifications
- Part Number: 1738-AENTR
- Series: ArmorPoint I/O
- Communication Protocol: EtherNet/IP (IEEE 802.3)
- Network Topology: Linear, Star, Device Level Ring (DLR)
- Ports: 2 × RJ45 (dual-port, integrated switch)
- Data Rate: 10/100 Mbps, auto-negotiate, full/half duplex
- IP Address Configuration: BOOTP, DHCP, or static
- Max I/O Modules per Node: Up to 8 ArmorPoint I/O modules
- Input Data Size: Up to 248 bytes
- Output Data Size: Up to 248 bytes
- Supply Voltage: 24V DC (±10%)
- Current Consumption: 200 mA @ 24V DC (max)
- Operating Temperature: -20°C to +60°C (-4°F to +140°F)
- Storage Temperature: -40°C to +85°C
- Enclosure Rating: IP67 (when properly mated)
- Vibration: IEC 60068-2-6, 5g @ 10–500 Hz
- Shock: IEC 60068-2-27, 30g
- Certifications: UL, CE, C-Tick, ATEX (Zone 2)
- Weight: 180 g
- Dimensions (H × W × D): Refer to Rockwell Automation Product Dimensions Drawing
- Mounting: DIN rail or panel mount via ArmorPoint base
Proven Application Environments
- Automotive Assembly Lines: Distributed I/O nodes on conveyor systems and robotic welding cells requiring IP67 protection and DLR redundancy
- Food & Beverage Processing: Washdown-rated I/O nodes in hygienic zones where stainless-steel enclosures are mandated
- Water & Wastewater Treatment: Outdoor pump stations and wet-well installations with extreme temperature cycling
- Material Handling & Logistics: Sorter systems and AGV charging stations requiring high-cycle I/O with minimal latency
- Oil & Gas (Zone 2): ATEX-certified installations in potentially explosive atmospheres
- Packaging Machinery: High-speed filling and labelling lines with distributed sensor/actuator networks
Engineering Advantages
- Device Level Ring (DLR) Support: Provides sub-3ms network recovery time, eliminating single points of failure in the EtherNet/IP ring without additional managed switches
- IP67 Native Design: Eliminates the need for costly IP-rated enclosures; modules mount directly on the machine frame
- Integrated Dual-Port Switch: Simplifies cabling topology — daisy-chain or ring without external switch hardware
- Hot-Swap Module Support: ArmorPoint I/O modules can be replaced under power without disrupting the network node
- Rockwell Studio 5000 / RSLogix 5000 Native: Full Add-On Profile (AOP) support for seamless integration into ControlLogix, CompactLogix, and GuardLogix controllers
- Embedded Web Server: Browser-based diagnostics and configuration without additional software
- QuickConnect Technology: Reduces node reconnection time to <100ms for high-speed machine restart cycles
System Architecture & Signal Flow
The 1738-AENTR acts as the EtherNet/IP scanner-to-I/O bridge within the ArmorPoint node. The controller (e.g., 1756-L8x ControlLogix or 5069-L3x CompactLogix) communicates via Class 1 implicit messaging to the adaptor. The adaptor then manages the ArmorPoint backplane, polling each I/O module at the configured RPI (Requested Packet Interval). Signal flow:
EtherNet/IP Network → 1738-AENTR Adaptor → ArmorPoint Backplane → I/O Modules (Digital/Analog/Safety)
- Supports Class 1 (I/O) and Class 3 (explicit messaging) EtherNet/IP connections
- Compatible with Logix-based controllers via RSLogix 5000 / Studio 5000 AOP
- DLR supervisor or ring node role configurable via RSLinx Classic or Studio 5000
- IGMP snooping support for multicast traffic management on managed switches
Sourcing & Quality Verification
- Origin: Genuine Allen-Bradley / Rockwell Automation manufactured product
- Traceability: Each unit carries Rockwell Automation serial number and date code for full supply-chain traceability
- Inspection: Pre-shipment functional verification including EtherNet/IP communication test and IP67 seal integrity check
- Packaging: Original OEM packaging with anti-static protection and moisture barrier
- Warranty: 12-month Konmask quality guarantee; Rockwell Automation standard warranty terms apply to new units
- Documentation: Certificate of Conformance (CoC) and test report available upon request
Procurement Process
- Submit RFQ: Contact support@konmask.com with quantity, required delivery date, and destination country
- Quotation: Receive formal quotation with lead time, unit price, and shipping options within 24 business hours
- Order Confirmation: Issue Purchase Order; Konmask confirms stock availability and reserves units
- Payment: T/T bank transfer, PayPal, or trade assurance accepted
- Shipment: DHL / FedEx / UPS express with full tracking; export documentation (commercial invoice, packing list, CoC) included
- After-Sales: Technical support via email or WhatsApp; replacement or refund within warranty period
Technical FAQ
Q: What is the maximum number of I/O modules supported per 1738-AENTR node?
A: Up to 8 ArmorPoint I/O modules per adaptor node, with a maximum of 248 bytes input and 248 bytes output data.
Q: Does the 1738-AENTR support Device Level Ring (DLR)?
A: Yes. The dual-port integrated switch supports DLR ring topology with sub-3ms recovery time, configurable as ring supervisor or ring node.
Q: Which Rockwell controllers are compatible?
A: ControlLogix (1756-Lx), CompactLogix (1769-Lx, 5069-Lx), GuardLogix (1756-LSx), and any EtherNet/IP scanner-capable controller running RSLogix 5000 or Studio 5000 v20+.
Q: Can the 1738-AENTR be used in ATEX Zone 2 environments?
A: Yes, with appropriate ATEX-certified installation practices and barriers as specified in Rockwell Automation publication 1738-IN001.
Q: Is the IP address configurable without a PC?
A: IP address can be set via BOOTP/DHCP server or via the embedded web server using a browser on the same subnet. Static IP assignment is also supported via RSLinx Classic.
Q: What is the minimum RPI (Requested Packet Interval)?
A: The minimum RPI is 1ms, though typical deployments use 5–20ms depending on application requirements and network load.
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