Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1738-ACNR |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Product Type | ArmorPoint ControlNet Network Adapter |
| Platform | 1738 ArmorPoint I/O Family |
| Network | ControlNet, 5 Mbps, co-axial |
| Network Connectors | 2 x TNC style (ControlNet A and B redundant media) |
| Power Connector | Mini-style auxiliary power connector |
| PointBus Capacity | Up to 63 ArmorPoint I/O modules per adapter |
| Direct Connections | Maximum 25 direct connections |
| Backplane Current Output | 1.0 A maximum |
| Isolation | 50 V (continuous), tested at 1500 VAC for 60 seconds |
| Enclosure Rating | IP65 / IP66 / IP67 (when correctly installed) |
| Vibration Rating | 5g |
| Node Addressing | Front-panel rotary switches |
| Status Indication | Adapter, PointBus, ControlNet A, ControlNet B, System Power, Adapter Power LEDs |
| Firmware | Flash upgradeable |
| Mounting | ArmorPoint I/O mounting base with auxiliary power terminals |
Main Features and Advantages
Redundant ControlNet media for maximum availability: The defining capability of the Allen-Bradley 1738-ACNR is its dual-channel ControlNet architecture, which transmits identical data across the A and B coaxial networks simultaneously. If a cable is damaged, a tap fails, or a connector works loose, the adapter continues communicating over the healthy channel without interruption, allowing the fault to be repaired during a planned maintenance window instead of causing unplanned downtime. This redundancy is particularly valuable in continuous-process plants, long cable runs traversing electrical rooms, and installations where network integrity directly supports production commitments.
High-capacity PointBus integration: A single 1738-ACNR can supervise up to 63 ArmorPoint I/O modules across its local PointBus segment while maintaining deterministic 5 Mbps network performance and up to 25 direct connections. This capacity allows large I/O clusters covering a production line, machine cell, or process skid to be consolidated onto one adapter, reducing network node count, simplifying control system architecture, and lowering total engineering cost compared with distributed adapter configurations.
Industrial-grade environmental protection: With IP65, IP66, and IP67 enclosure ratings and 5g vibration endurance, the 1738-ACNR can be installed directly onto machinery, in washdown areas, and in outdoor locations without an additional protective cabinet. The TNC-style coaxial connectors and mini-style auxiliary power connector maintain sealing integrity in wet and dusty environments, while channel-level diagnostic capability in the ArmorPoint ecosystem extends fault visibility to the individual I/O point.
Clear status indication and easy addressing: The front panel of the 1738-ACNR provides six dedicated LEDs covering Adapter Status, PointBus Status, ControlNet A Status, ControlNet B Status, System Power, and Adapter Power, giving maintenance technicians an immediate visual summary of network health without a programming terminal. Node addressing is set through front-panel rotary switches, allowing replacement units to be configured in seconds without software intervention.
Flash-upgradable and RIUP capable: Firmware on the Allen-Bradley 1738-ACNR can be upgraded in the field via ControlNet, allowing feature enhancements and defect corrections to be applied without hardware replacement or network redesign. Combined with Removal and Insertion Under Power support across the ArmorPoint range, individual modules can be serviced while the remainder of the I/O segment continues operating, minimising production impact during maintenance interventions.
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