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Description
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 1738-ACNR |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | ArmorPOINT ControlNet Communication Adapter |
| Communication Protocol | ControlNet |
| Communication Rate | 5 Mbits/s -7 |
| Network Connectors | 2 x Redundant TNC Style Connectors (Channel A/B) -4 |
| Power Connector | 1 x Mini Style 24V DC Connector -4 |
| Maximum I/O Modules Supported | 63 Modules -7 |
| Maximum Connections | 25 Direct Connections / 5 Rack Optimized Connections -2 |
| Input Voltage Range | 10…28.8V DC (24V DC Nominal) -11 |
| Field Side Power Requirement | 425 mA @ 24V DC -10 |
| Inrush Current | 6A for 10ms maximum -10 |
| PointBus Output Current | 1.0A @ 5V DC -2 |
| Dimensions (H×W×D) | 112 × 72 × 65 mm -11 |
| Operating Temperature | -20°C to +60°C -10 |
| Storage Temperature | -40°C to +85°C -10 |
| Enclosure Rating | IP67 (Sealed, No Enclosure Required) -4 |
Main Features and Advantages
IP67 Rugged Housing for On-Machine Installation: The Allen‑Bradley 1738-ACNR is enclosed in a robust, IP67-rated housing that is fully sealed against dust, water, and high-pressure washdowns, eliminating the cost and panel space associated with traditional enclosures -4-3. This makes the 1738-ACNR the ideal choice for food and beverage, automotive, and material handling applications where equipment is exposed to harsh cleaning agents or moisture. With the ability to operate reliably in ambient temperatures from -20°C to 60°C, the 1738-ACNR can be placed directly on the machine near sensors and actuators, significantly reducing long cable runs and simplifying wiring.
Redundant ControlNet Media Support: The 1738-ACNR features two TNC-style connectors, facilitating a redundant media configuration for critical applications -4. This dual-channel design allows the 1738-ACNR to automatically maintain communication even in the event of a cable break or failure on one network channel, providing the high availability required for continuous process operations and critical emergency shutdown systems. The adapter’s status LEDs provide at-a-glance diagnostics for both ControlNet channels, the PointBus, and overall system power, greatly simplifying troubleshooting -11.
Scalable I/O Architecture: The Allen‑Bradley 1738-ACNR supports an impressive I/O capacity, allowing up to 63 ArmorPOINT I/O modules to be assembled on a single ControlNet node -7. This high-density capability is enabled by the adapter’s 1.0A PointBus current output, which can be further extended with a 1738-EP24DC expansion power supply to support power-intensive configurations -2. The 1738-ACNR intelligently manages data with support for 25 Direct Connections for analog and specialty modules, and 5 Rack Optimized connections for efficient handling of digital modules, allowing system architects to build efficient, cost-optimized distributed control networks -2.
High-Speed ControlNet Data Transfer: The 1738-ACNR leverages the deterministic, high-speed nature of the ControlNet protocol, operating at 5 Mbits/s to ensure time-critical data is delivered reliably and predictably -7. This deterministic performance is vital for motion control coordination and complex process interlocking, enabling seamless integration into the Rockwell Automation Integrated Architecture™.
