Allen-Bradley 1734-IJ Encoder Module | 1 MHz Input

Allen-Bradley 1734-IJ Incremental Encoder Module

Product Introduction

The Allen-Bradley 1734-IJ belongs to the POINT I/O family and serves as a dedicated Incremental Encoder Module. It processes high-frequency signals from incremental encoders, providing accurate position and speed data. This module supports input frequencies of 1 MHz, 500 kHz, or 250 kHz, making it suitable for various motion applications. Additionally, its compact design saves valuable panel space. For instance, you can easily integrate it into existing POINT I/O systems. The 1734-IJ operates on a 5 Volts DC supply and offers 50 Volts of continuous isolation voltage. Furthermore, its user-selectable preset and roller values enhance flexibility for different counting tasks.

Technical Specifications

Input and Counter Features

The 1734-IJ includes a single high-speed counter. Its selectable input frequencies are 1 megahertz, 500 kilohertz, or 250 kilohertz. Meanwhile, the nominal input voltage is fixed at 5 Volts DC. The input current measures 19.1 mA at 5V and 25.7 mA at 6V. Specifically, the off-state maximum current is ≤ 0.250 mA, and the off-state voltage is ≤ 1.25 Volts DC. On the other hand, the on-state voltage ranges from +6V to -6V, with a current ≥ 5 mA and voltage ≥ 2.6V. The module returns a 24-bit binary frequency value (0 to 16,777,215) expressed in a 32-bit long word. Additionally, it provides 6 or 10 bytes of input data (scanner Rx) and consumes 1 byte of output data (scanner Tx).

Isolation and Power Ratings

This module provides a continuous isolation voltage of 50 Volts between the field side and the system. Its maximum POINTbus current draw is 160 mA. Moreover, the 1734-IJ dissipates a maximum power of 1.1 Watts at rated load. Its thermal dissipation is rated at 3.75 BTU/hour. Notably, users do not require any external DC power supply for operation. This feature simplifies installation and reduces component costs.

Voltage Types and Signal Inputs

The Allen-Bradley 1734-IJ supports three voltage return types: Areturn, Breturn, and Zreturn. These inputs enable the module to decode quadrature encoder signals effectively. The A and B channels provide count and direction information, while the Z channel offers a reference or zero marker pulse. Consequently, this configuration allows for precise position tracking and speed measurement. The module also features three yellow status indicators for the A, B, and Z inputs. These indicators flash when the corresponding input is toggling, providing real-time visual feedback. This unique feature helps technicians quickly verify signal integrity during commissioning.

Mechanical and Environmental Specifications

The 1734-IJ measures 2.21 x 0.47 x 2.97 inches and weighs only 0.08 pounds. Its operating temperature ranges from -4 to 131 degrees Fahrenheit, while its non-operating range extends from -40 to 185 degrees Fahrenheit. Furthermore, it withstands an operating shock of 30 g and a non-operating shock of 50 g. The module also handles operating vibration of 5 g at 10 to 500 Hertz. Additionally, it operates reliably in non-condensing humidity conditions from 5% to 95%. These rugged specifications make the Allen-Bradley 1734-IJ suitable for demanding industrial environments.

Installation and Mounting Guidance

Mounting Options

The 1734-IJ supports both DIN rail and panel mounting methods. For DIN rail installation, simply snap the module onto the rail after attaching it to a compatible wiring base. Acceptable wiring bases include the 1734-TB, 1734-TBS, 1734-TB3, or 1734-TB3S models. For panel mounting, use the appropriate hardware to secure the module in place. This flexibility allows the 1734-IJ to fit various enclosure designs and space constraints.

Wiring Requirements

This module accepts solid or stranded copper wire ranging from 22 to 14 AWG. The wiring category for its signal ports is rated as Category 1. Meanwhile, the key switch position is set to 2, ensuring proper configuration within the POINT I/O system. The open-type enclosure design facilitates easy access during wiring and maintenance. However, ensure all connections are secure and follow the manufacturer's guidelines for optimal performance.

Data Communication

The 1734-IJ communicates over the POINTbus backplane. It produces 6 or 10 bytes of input data for the scanner and consumes 1 byte of output data. The module returns frequency readings as a 24-bit binary number (0 to 16,777,215) within a 32-bit long word. Moreover, each counter includes a user-selectable preset value and a roller value for customized counting operations. This data structure enables seamless integration with Rockwell Automation controllers.

Status Indicators and Diagnostics

The module features five status indicators for easy diagnostics. One red/green indicator shows module status, and another red/green indicator displays network status. Additionally, three yellow indicators monitor the A, B, and Z inputs. When an input toggles, its corresponding yellow indicator flashes, providing immediate visual confirmation. This diagnostic capability significantly reduces troubleshooting time during system startup and maintenance.

Packaging List

Each shipment of the Allen-Bradley 1734-IJ includes the following items:

• One 1734-IJ Incremental Encoder Module

• One mounting bracket (pre-attached)

• One user manual quick start guide

Please note that wiring bases are sold separately. Customers should select the appropriate base (1734-TB, 1734-TBS, 1734-TB3, or 1734-TB3S) based on their wiring requirements. All items are packaged in anti-static material to prevent damage during transit.

Shipping Information

We ship all orders via FedEx, UPS, or DHL. Standard delivery typically takes 3 to 5 business days, depending on the destination. Expedited shipping options are also available upon request. All packages are fully tracked and insured for your peace of mind. Please contact our sales team for specific shipping quotes and delivery timelines.

Frequently Asked Questions

Q1: What wiring bases are compatible with the 1734-IJ?
A1: The 1734-IJ works with the 1734-TB, 1734-TBS, 1734-TB3, and 1734-TB3S wiring bases. Choose the model that best suits your terminal block preferences and installation needs.

Q2: Does the 1734-IJ require an external power supply?
A2: No, the 1734-IJ draws its operating power directly from the POINTbus backplane. It does not require any additional external DC power supply, which simplifies installation.

Q3: What is the maximum input frequency this module can handle?
A3: The 1734-IJ supports selectable input frequencies of 1 MHz, 500 kHz, or 250 kHz. Users can choose the appropriate setting based on their encoder specifications.

Q4: How do I know if the encoder signals are being received correctly?
A4: The module has three yellow status indicators for the A, B, and Z inputs. These indicators flash when the corresponding input is toggling, providing real-time visual confirmation of signal activity.

Q5: What is the continuous isolation voltage rating for this module?
A5: The 1734-IJ provides 50 Volts of continuous isolation voltage between the field side and the system. This isolation helps protect the control system from electrical noise and potential faults.