Allen Bradley 1794-IJ2 Flex I/O 2-Input Frequency Module

Product Overview

The Allen Bradley 1794-IJ2 serves as a specialized frequency input component within the Flex I/O family. This module captures and processes high-speed frequency signals from flow meters, tachometers, and encoders, converting physical pulses into actionable data for the PLC backplane. It features two independent frequency channels, each equipped with a dedicated gate input to provide precise control over measurement windows. We supply this product as 100% Brand New in its original factory packaging to ensure maximum performance and longevity in your control architecture.

Technical Specifications

The 1794-IJ2 module manages complex pulse data with the following hardware parameters:

Engineering Advantages

• High-Speed Signal Acquisition: The 1794-IJ2 handles input frequencies up to 32 kHz. This capability allows the module to interface with high-resolution turbine flow meters and high-speed motor shafts without losing pulse counts.

• Integrated Output Control: Unlike standard input modules, the 1794-IJ2 includes two 24V DC isolated outputs. This allows the system to trigger local field devices directly based on frequency thresholds, reducing the processing load on the central CPU.

• Enhanced Signal Versatility: The internal circuitry accepts both sine wave and square wave inputs. This flexibility eliminates the need for external signal conditioners when switching between different sensor technologies.

• Space-Efficient Design: As part of the Flex I/O series, this module snaps onto a compact terminal base. This modular approach reduces cabinet footprint by replacing traditional rack-based I/O with distributed, DIN-rail mounted blocks.

• Thermal Management: The module limits thermal dissipation to 15.6 BTU/hr. This low heat signature prevents localized hot spots within high-density electrical enclosures, extending the life of adjacent electronic components.

FAQs

• Is the 1794-IJ2 provided as a new or used unit?

  We guarantee the 1794-IJ2 is 100% Brand New. It ships in the original Allen Bradley box with factory seals intact.

• Which terminal base does this module require?

  You must install the 1794-IJ2 on a 1794-TB3G or 1794-TB3GS terminal base. These bases provide the necessary grounding and terminal connections for the frequency and gate inputs.

• Can the module handle 5V signals?

  The module requires a minimum on-state voltage of 10V DC for frequency inputs. If your sensors output 5V TTL signals, you will need a signal level shifter to ensure reliable pulse detection.

• How does the gate input function?

  The gate input acts as a hardware-level "enable" switch. The module only counts or measures the frequency at the main input when the corresponding gate input receives a high signal, allowing for synchronized measurement cycles.