The 1756-DHRIO module from ALLEN-BRADLEY is a dedicated bridge interface designed to connect ControlNet and Data Highway Plus networks within the Rockwell Automation ecosystem. This module is engineered for high-reliability industrial applications, providing transparent data routing between modern Logix-based controllers and legacy DH+ devices. It supports both scheduled and unscheduled messaging, ensuring deterministic performance for time-critical processes. The 1756-DHRIO is fully compatible with ControlLogix chassis and can be configured via RSLogix 5000 software. It features dual DH+ ports for redundant cabling and offers a maximum DH+ node address range of 0-77 octal. The module operates over a wide temperature range (-20°C to +60°C) and is certified for hazardous locations (Class I, Division 2). Below is the detailed technical specification table:
| Parameter |
Specification |
| Product Type |
ControlNet-to-Data Highway Plus Bridge Module |
| Model Number |
1756-DHRIO |
| Network Interfaces |
1 x ControlNet (coaxial BNC), 2 x Data Highway Plus (twinaxial) |
| DH+ Node Support |
Up to 64 nodes per DH+ channel (address range 0-77 octal) |
| ControlNet Node Support |
Up to 125 nodes per ControlNet segment |
| Data Rate (DH+) |
57.6 kbps, 115.2 kbps, or 230.4 kbps (configurable) |
| Data Rate (ControlNet) |
5 Mbps |
| Messaging Types |
Scheduled (CIP Sync) and Unscheduled (CIP) |
| Chassis Slot Requirement |
Single-wide slot in 1756 ControlLogix chassis |
| Power Consumption |
1.5 A Standard Models 5.1 VDC (from backplane) |
| Operating Temperature |
-20°C to +60°C (-4°F to +140°F) |
| Storage Temperature |
-40°C to +85°C (-40°F to +185°F) |
| Humidity Range |
5% to 95% non-condensing |
| Vibration Resistance |
5 g Standard Models 10-500 Hz (operational) |
| Shock Resistance |
30 g (11 ms half-sine) |
| Enclosure Type |
Open-style, IP20 (requires cabinet) |
| Hazardous Location Certification |
Class I, Division 2, Groups A, B, C, D (T4) |
| LED Indicators |
Module Status, Network Status, DH+ Channel 1 & 2 Activity, ControlNet Activity |
| Configuration Software |
RSLogix 5000 (version 16 or later) / Studio 5000 |
| Firmware Compatibility |
Revision 3.001 or higher (field-upgradable) |
| Weight |
0.5 kg (1.1 lb) |
| Dimensions (H x W x D) |
144 mm x 46 mm x 127 mm (5.67 in x 1.81 in x 5.0 in) |
| MTBF |
1,000,000 hours (calculated per MIL-HDBK-217F) |
| Warranty |
Standard 2-year manufacturer warranty |
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