Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | 1756-RIO/A (Series A) |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Module Type | Remote I/O Communication Module |
| RIO Channels | 1 |
| Operating Modes | Scanner Mode / Adapter Mode |
| Max Physical Racks | 32 (Scanner Mode) |
| Communication Rates | 57.6 kbps, 115.2 kbps, 230.4 kbps |
| Backplane Current | 450 mA @ 5.1V DC; 5 mA @ 24V DC |
| Power Dissipation | 2.5 W (8.5 BTU/hr) |
| Isolation Voltage | 50V continuous (RIO port to backplane) |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Cable Type | Belden 9463 twinaxial cable |
Main Features and Advantages
Dual‑role flexibility: The 1756-RIO/A can be configured in two distinct ways. In Scanner Mode, it acts as the master of the RIO network, scanning up to 32 remote adapter devices (such as 1771-ASB modules) and mapping their I/O data directly into the ControlLogix controller’s tag database. In Adapter Mode, the module allows a ControlLogix chassis to emulate a classic remote I/O rack, enabling it to be scanned by legacy PLC‑5 or SLC 500 systems. This dual functionality provides exceptional flexibility for phased migration strategies.Legacy I/O integration: The module fully supports the RIO protocol’s discrete I/O scanning and block transfer (BT) mechanisms. This means it can handle not only simple digital points but also complex analog modules and intelligent devices that require large data transfers. By reusing existing field wiring and termination panels, the 1756-RIO/A significantly reduces the cost and downtime associated with full system replacements.Seamless ControlLogix integration: Configured entirely within the Studio 5000/RSLogix 5000 environment, the 1756-RIO/A presents RIO data as standard tags in the controller. This abstraction eliminates the need for low‑level messaging instructions, making the legacy network appear as an integral part of the modern control system. The module’s status is fully visible through the software, simplifying diagnostics and maintenance.
Application Field
The 1756-RIO/A is predominantly used in industrial sectors with extensive installed bases of Allen‑Bradley 1771 I/O systems. In automotive and heavy manufacturing plants, it is deployed to connect ControlLogix controllers to remote I/O racks located in distant cells or on large machinery, preserving the existing field infrastructure. In water/wastewater treatment and power generation facilities, the module is often used to integrate legacy pump station or substation I/O into a centralized ControlLogix‑based SCADA system without rewiring.
Related Products
- 1756-DHRIO/E: A dual‑channel module that handles both DH+ and Remote I/O protocols, suitable for hybrid networks.
- 1771-ASB: The classic remote I/O adapter module that the 1756-RIO/A typically scans in a legacy system.
- 1794-ASB: Flex I/O adapter module for connecting Flex systems to a RIO network via the 1756-RIO/A.
- 1756-ENBT/A: EtherNet/IP communication module for integrating the same chassis into modern Ethernet networks.
- 1756-L61/L62: Common ControlLogix controllers used in conjunction with the 1756-RIO/A for system integration.
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