As a professional supplier, Feimu Technology has introduced a dedicated communication module for the ControlLogix platform - Allen Bradley 1756-DHRIO. It is specifically designed to solve the communication problems between new and old industrial control systems, supporting both DH+ and DH-485 protocols. We understand that many old devices in the industrial field are still in use, and complete elimination would be too wasteful. This module can enable seamless collaboration between new and old systems.
The 1756-DHRIO module is the core communication component of the Rockwell ControlLogix system. It can perfectly adapt to the ControlLogix platform and can directly communicate with the old PLC-5 and SLC 500 systems. In factory upgrade projects, we often encounter problems where new ControlLogix controllers cannot communicate with the old systems or data cannot be transmitted. This module can easily solve these issues without requiring significant modifications to the new and old systems, enabling two-way data interoperability. As a company deeply involved in industrial control, we are well aware of the pain points in on-site upgrades. This module is easy to use, requires no complex debugging, and experienced engineers familiar with the ControlLogix system can quickly complete the deployment.
There are many similar modules on the market. The fan ports are covered with dust and oil stains, and the firmware version is outdated. After receiving the product, you need to clean and upgrade it by yourself, which is very cumbersome. As a professional supplier, before shipping each module, we will thoroughly clean the casing, remove the old labels, and more importantly, we will assist customers in upgrading the firmware to the mainstream version to ensure that you can directly use it after receiving the product, eliminating the trouble of searching for upgrade software and manually upgrading. The products we supply are all brand new Allen Bradley 1756-DHRIO. They have stable performance and smooth communication, completely solving the problems of poor compatibility and inconvenience of using outdated modules.
Based on our practical experience, the 1756-DHRIO is mainly used in factory system upgrade scenarios, such as the communication connection between new ControlLogix controllers and old PLC-5 and SLC 500 systems, to achieve data interoperability and collaborative operation of new and old equipment in the workshop. Whether it is production line upgrade, equipment renovation, or data collection from the old system, it can play a core role, break the data barriers between new and old systems, and achieve seamless connection throughout the workshop. At the same time, the product is affordable in price and has high cost-effectiveness, which can reduce the cost of system upgrade.
The Allen Bradley 1756-DHRIO is a DH+ / DH-485 communication module for the ControlLogix system. It acts as a gateway between new ControlLogix controllers and legacy PLC-5 and SLC 500 systems.
| Parameter | Specification |
|---|---|
| Product Model | Allen Bradley 1756-DHRIO |
| Product Type | DH+ / DH-485 Communication Module |
| Compatible System | ControlLogix (1756 chassis) |
| Supported Protocols | DH+ (57.6 kbps), DH-485 (19.2 kbps) |
| Communication Ports | 2 configurable ports (channel A and channel B) |
| Port Configuration | Each port can be set as DH+ or DH-485 independently |
| Maximum Nodes per Port | 64 nodes (DH+) / 32 nodes (DH-485) |
| Maximum Cable Length | 3048 meters (DH+ with RG-6 cable) / 1219 meters (DH-485) |
| Data Transfer Rate | 57.6 kbps (DH+) / 19.2 kbps (DH-485) |
| Isolation | 500V between ports and backplane |
| Backplane Current Draw | 1.5A at 5V DC |
| Power Dissipation | 6W maximum |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Certifications | UL, cUL, CE, ATEX |
The 1756-DHRIO supports both DH+ and DH-485 protocols. Each has different characteristics. This comparison helps you select the correct protocol for your application.
| Feature | DH+ (Data Highway Plus) | DH-485 (Data Highway 485) |
|---|---|---|
| Data rate | 57.6 kbps | 19.2 kbps |
| Max nodes per network | 64 nodes | 32 nodes |
| Max cable length | 3048 meters | 1219 meters |
| Typical cable | RG-6 (75Ω) | Belden 9842 or equivalent |
| Common applications | PLC-5 systems, large networks | SLC 500 systems, smaller networks |
| Network type | Peer-to-peer | Token passing |
When to use each:
The 1756-DHRIO enables data exchange between ControlLogix controllers and legacy PLC-5 and SLC 500 systems. This diagram shows the communication flow.
System architecture example:
What data can be exchanged:
Real-world scenario: A factory had a PLC-5 system controlling a mixing process and a SLC 500 system controlling a packaging line. They installed a new ControlLogix system for plant-wide SCADA. The 1756-DHRIO connected all three systems. The SCADA system now reads data from both old systems through the ControlLogix. No changes were needed to the old PLC programs. The upgrade was completed in one week instead of three months.
The 1756-DHRIO requires configuration in Studio 5000. Correct port configuration is essential for reliable communication.
Key configuration parameters:
Configuration steps in Studio 5000:
Common configuration mistakes:
The 1756-DHRIO has several LEDs on the front panel. These provide immediate status information without a programming terminal.
| LED | Status | Meaning | Action |
|---|---|---|---|
| PWR | Green | Module powered and operating normally. | No action needed. |
| PWR | Off | No power to module. | Check chassis power. Check that module is inserted. |
| OK | Green | Module running. No faults. | No action needed. |
| OK | Red | Module fault. Hardware failure or configuration error. | Reinsert the module. Check configuration. Replace if red remains. |
| Port A / Port B | Green | Port active. Communication is present. | No action needed. |
| Port A / Port B | Off | Port not active. No cable connected or no communication. | Check cable. Check the device on the other end. |
| Port A / Port B | Flashing | Port is transmitting or receiving data. | Normal operation. Indicates active communication. |
Allen Bradley 1756-DHRIO modules are commonly counterfeited. Use these checks to verify authenticity.
If the module shows red OK LED after correct configuration, suspect a counterfeit. Contact Feimu Technology with photos for verification.
Feimu Technology started in Jiangmen, Guangdong in 2005. We supply original Allen Bradley, Siemens, GE, and Schneider components to customers in over 30 countries.
Contact us:
Email: sales@feimutech.com
WhatsApp: +86 13358323579
Website: www.feimuplc.com
Response time: Within 24 hours. Technical questions typically answered within 12 hours.
Q: What communication protocols does the Allen Bradley 1756-DHRIO support?
A: It supports both DH+ and DH-485 protocols. It can directly connect to old systems such as PLC-5 and SLC 500, and can simultaneously enable communication between multiple old systems and the new ControlLogix controller, meeting the collaborative needs of multiple equipment in the workshop.
Q: Is there an additional fee for firmware upgrade? Is the debugging process complex?
A: There is no additional fee. Before shipment, we will assist with upgrading to the mainstream firmware version for free. The debugging operation is in line with the regular operations of the ControlLogix system. Engineers familiar with this series of products can quickly get started.
Q: Can module cleaning and firmware upgrade ensure the stability of usage?
A: We strictly control every step of the process. Deep cleaning can prevent dust and oil from affecting the operation. Upgrading the firmware to the mainstream version can enhance compatibility. These two measures provide dual guarantees for the stable operation of the module, so there is no need to worry about any usage failures.
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