Allen-Bradley 1794-IJ2 Flex 2 Point Input Frequency Module

Description 

The Allen-Bradley 1794-IJ2 is a Flex I/O module designed for frequency input within the 1794 Flex I/O system. It features two high-resolution frequency input channels, each with two inputs: one for frequency and one for gate. This module supports input frequencies ranging from 1 to 32 kHz for both sine and square waves, and has an input pulse width of 20 µs.

Technical Specifications 

Information About 1794-IJ2

The Allen-Bradley 1794-IJ2 is a DC input frequency module from the Flex I/O family, operating on 24V DC. It supports a rack-based configuration, allowing up to eight terminals to be configured simultaneously using an adapter module.

This module features two inputs, two outputs, and two frequency inputs, enabling it to perform high-speed algorithms. It is commonly used in applications involving measurements of acceleration, direction, or frequency at a specific point in time. The inputs and outputs are electrically fused to protect against power supply interruptions and include indicators for process identification and power status.

Installation is straightforward, with options for screw mounting or DIN rail mounting using a 1794-NM1. The flex bus connector must be fully inserted into the terminal unit. The module supports communication via Profibus or Ethernet networks.

It operates within a temperature range of 0 to 55 degrees Celsius and has a maximum starting current of 10 A. The front panel includes an input indicator, an insertable label for I/O assignments, a wire-off fault indicator, an output indicator, and a power status indicator.

The 1794-IJ2 module supports input frequencies from 1 to 32 kHz for both sine and square waves, with a maximum frequency value of 32,767 or 3,276.7 depending on the range and an input pulse width of 20 µs. It has two isolated outputs with a minimum output voltage of 10V DC, a maximum of 31.2V DC, and a nominal voltage of 24V DC. The on-state current is 1 mA per output, with a maximum of 1.0 A per channel and a surge current of 2 A for 50 ms, repeatable every 2 seconds.

The output channels can be individually assigned to Frequency, % Full Scale, or Acceleration Alarm. The output switching time is determined by frequency or acceleration alarm, with a turn-on time of 0.5 ms and a turn-off time of 1 ms.

Manufacturer information

Allen-Bradley, a brand of Rockwell Automation, specializes in manufacturing industrial automation equipment. The product range includes programmable logic controllers (PLCs), motion control systems, safety devices, motor control equipment, automation software, and HMI panels. Allen-Bradley products are known for their reliability and integration with other systems.