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Industrial Communication Module Technical Report
Model: 1756-DHRIO/C Data Highway Plus / Remote I/O Communication Interface
1. Product Overview
The 1756-DHRIO/C is a ControlLogix communication module designed to integrate legacy industrial networks such as Data Highway Plus (DH+) and Remote I/O (RIO) into modern automation systems.
It serves as a dual-channel communication interface, allowing a ControlLogix controller to exchange data with older PLC systems, distributed I/O racks, and legacy industrial devices.
This module is widely used in migration and hybrid automation projects where existing DH+ or RIO infrastructure must remain operational while being connected to newer control platforms.
The “/C” revision indicates a later hardware generation with improved environmental specifications and updated firmware compatibility.
2. Brand and Series Information
- Brand: Industrial automation control platform
- Series: ControlLogix 1756 Series
- Product Family: Communication / Legacy Network Interface Modules
- Module Type: DH+ / Remote I/O Communication Module
The 1756 series is a modular automation architecture designed for scalable industrial control systems and multi-protocol communication support, including legacy industrial networks.
3. Product Description
The 1756-DHRIO/C module provides two independent communication channels:
- Channel A and Channel B can be configured for DH+ or RIO operation
- Supports simultaneous or independent network communication depending on configuration
It acts as a bridge between modern ControlLogix controllers and legacy automation systems, enabling communication without replacing existing field infrastructure.
It supports message routing across multiple networks and chassis, making it suitable for complex industrial installations with mixed-generation equipment.
4. Technical Parameters
| Parameter | Specification |
|---|---|
| Communication Protocols | Data Highway Plus (DH+), Remote I/O (RIO) |
| Channels | 2 independent channels (A & B) |
| Data Rates | 57.6 kbps, 115.2 kbps, 230.4 kbps |
| Maximum DH+ Nodes | up to 64 nodes |
| Maximum RIO Devices | up to 32 logical devices per channel |
| Maximum Cable Length | up to 3048 m (10,000 ft) at low baud rate |
| Backplane Current (5V) | ~1.07 A |
| Backplane Current (24V) | ~3 mA |
| Power Consumption | ~4.5–5 W |
| Thermal Dissipation | ~15–18 BTU/hr |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5% – 95% non-condensing |
| Vibration Resistance | 2 G (10–500 Hz) |
| Shock Resistance | 30 G operating |
| Chassis Compatibility | 1756 ControlLogix chassis |
| Slot Width | 1 slot |
| Dimensions | approx. 145 × 35 × 118 mm |
| Weight | ~0.30 kg |
5. Product Applications
The 1756-DHRIO/C is primarily used in legacy integration and industrial modernization scenarios:
- Migration from PLC-5 and SLC 500 systems
- DH+ network communication in legacy plants
- Remote I/O rack integration
- Oil and gas refinery legacy system upgrades
- Power plant control system modernization
- Manufacturing plants with mixed PLC generations
- Industrial data bridging between old and new control systems
- Distributed legacy equipment communication
It is especially valuable in environments where full system replacement is not feasible due to cost, downtime, or infrastructure complexity.
6. Product Advantages
- Dual-channel support for DH+ and Remote I/O
- Enables seamless integration of legacy systems
- Supports long-distance industrial communication (up to 10 km)
- Flexible channel configuration (DH+ or RIO per channel)
- Stable deterministic legacy protocol handling
- Reduces cost of full system replacement
- Reliable operation in harsh industrial environments
- Strong compatibility with installed base of legacy PLC systems
- Supports multi-network routing across chassis
- Mature and widely proven migration solution
7. Same Series / Related Models (ControlLogix Communication Family)
| Model | Function | Key Parameters |
|---|---|---|
| 1756-DHRIO/C | DH+ / RIO communication module (rev C) | Dual-channel, legacy protocol support |
| 1756-DHRIO | Standard DH+ / RIO module | Earlier revision, same core function |
| 1756-DH485 | DH-485 communication module | Lower-speed legacy serial network |
| 1756-CN2R | ControlNet redundant module | 5 Mbps redundant industrial network |
| 1756-EN2TR | EtherNet/IP redundant module | Dual Ethernet ports, modern industrial network |
8. Other Popular Modules in Same Ecosystem
| Model | Function | Key Parameters |
|---|---|---|
| 1756-L71 | PLC controller module | High-performance CPU, large memory capacity |
| 1756-L72 | Advanced controller module | Faster execution and expanded capability |
| 1756-IF8 | Analog input module | 8-channel analog signal acquisition |
| 1756-OB16E | Digital output module | 16-point electronic output module |
| 1756-IB16 | Digital input module | 16-channel industrial digital input |
9. Engineering Summary
The 1756-DHRIO/C is a specialized legacy communication interface designed for bridging older industrial networks with modern ControlLogix systems. Its primary function is not high-speed data processing but compatibility and system integration.
It remains widely used in industrial retrofit projects where DH+ and Remote I/O infrastructure must be preserved while enabling migration to modern PLC platforms.
With dual-channel flexibility, long-distance communication support, and strong industrial reliability, it is a key component in legacy-to-modern automation transition strategies.