1756-RIO Allen-Bradley ControlLogix RIO Module

Allen-Bradley 1756-RIO ControlLogix Remote I/O Communication Module

Product Introduction

The 1756-RIO from Allen‑Bradley connects a ControlLogix processor to a Remote I/O network. This module gives you flexibility because it can act as a scanner or an adapter. Out of the box, it ships in default scanner mode. As a scanner, it supports up to 32 physical adapters on a single RIO channel.

Furthermore, the Allen-Bradley 1756-RIO handles block transfer instructions automatically. It also transports analog and specialty data without requiring separate message instructions. Data updates happen regularly between the controller and I/O adapter connections. This makes the module ideal for integrating older RIO devices into modern ControlLogix systems.

For instance, you can use the 1756-RIO to interface with HMI or SCADA systems via Allen‑Bradley communication cards. It also sends messages to other controllers on the same RIO network. The physical cable required is the 1771-CD or Belden 9463 (commonly known as Blue Hose).

Technical Specifications

• Manufacturer: Allen‑Bradley

• Series: ControlLogix

• Module Type: Remote I/O Adapter Module

• Function: Scanner or adapter on RIO network

• RIO ports: 1

• Maximum physical racks supported: 32 (racks 0…76, any combination)

• Scheduled I/O connections: 10

• Default mode: Scanner

• Supported baud rates: All remote I/O baud rates

• Cable type: 1771-CD or Belden 9463 (Blue Hose)

• Wire size: 20 AWG

Electrical Ratings

• Backplane current (5.1V DC): 450 mA

• Backplane current (24V DC): 5 mA

• Power dissipation (max): 2.5 Watts

• Thermal dissipation: 8.5 BTU/hr

• Isolation voltage: 50V continuous (basic insulation type)

• Isolation tested at: 500V AC for 60 seconds (RIO to backplane)

Physical & Environmental Specifications

• Dimensions: 5.51 x 4.41 x 5.71 inches

• Operating temperature: 0°C to 60°C (32°F to 140°F)

• Enclosure: None (open-style)

• Location: Chassis (any slot)

• Chassis compatibility: 1756‑A4, 1756‑A7, 1756‑A10, 1756‑A13, 1756‑A17

• UPC: 10612598553843

Compatible Power Supplies

Standard power supplies:

• 1756‑PA72/C, 1756‑PA75/B, 1756‑PB72/C, 1756‑PB75/B, 1756‑PC75/B, 1756‑PH75/B

Redundant power supplies:

• 1756‑PA75R, 1756‑PB75R, 1756‑PSCA2

Installation Guide

First, power down the ControlLogix chassis completely. This prevents electrical arcing during installation. Then choose any available slot in the chassis. The 1756-RIO is a single-slot module, so it does not require multiple slots.

Next, insert the Allen-Bradley 1756-RIO firmly into the chassis until the locking mechanism engages. Connect the RIO network using 1771-CD or Belden 9463 cable to the module's single RIO port. Then power up the chassis.

You can install multiple 1756-RIO modules in the same chassis. However, the total number depends on your power supply rating. Always calculate the total backplane current draw before adding multiple modules.

Operation Modes

Scanner mode (default): The module actively manages up to 32 physical adapters. It automatically updates block transfers at all possible rack locations. All partial rack combinations are supported.

Adapter mode: The module allows the ControlLogix controller to monitor or exchange data with an existing system scanner. This is useful when integrating into legacy RIO networks.

Packaging List

• 1 x 1756-RIO Remote I/O Communication Module

• 1 x quick reference guide

• No cable included (1771-CD or Belden 9463 sold separately)

• No certificate or warranty documents included

Shipping Methods

We ship worldwide using Fedex, UPS, or DHL. Tracking number provided within 24 hours.

Frequently Asked Questions (FAQ)

1. Can the 1756-RIO be a scanner and an adapter at the same time?
No. The 1756-RIO operates in one mode at a time. It ships as a scanner by default. You can reconfigure it as an adapter through software.

2. What cable do I need for the RIO connection?
Use 1771-CD or Belden 9463 cable. This is commonly called "Blue Hose" in the industry. Standard Ethernet cables will not work.

3. How many 1756-RIO modules can I install in one chassis?
It depends on your power supply. Each Allen-Bradley 1756-RIO draws 450 mA at 5.1V and 5 mA at 24V. Add up all module currents and stay within your power supply's capacity.

4. Does this module support analog data transfer?
Yes. The 1756-RIO handles analog and specialty data through block transfer instructions. No separate message instructions are required.

5. Can I use the 1756-RIO with redundant controllers?
Yes. The Allen-Bradley 1756-RIO supports both simplex and redundant controller topologies. Use it with redundant power supplies like the 1756‑PA75R or 1756‑PB75R.