1794-IJ2

Overview

1794-IJ2 is an Allen-Bradley FLEX I/O frequency input module with 2 channels, designed for high-speed frequency measurement and direction detection using gate inputs.

Module Identity

• Model: 1794-IJ2

• Product Type: FLEX I/O Frequency Input Module

• Manufacturer: Allen-Bradley Rockwell

• Number of Input Channels: 2

• Inputs per Channel: Frequency + Gate (gate used to establish direction)

Input Specifications

• Input Frequency Range: 1…32 kHz (sine wave or square wave)

• Maximum Frequency Value: 32,767 or 3,276.7 (dependent on range)

• Input Pulse Width: 20 µs

Electrical Characteristics

• On-State Voltage (max): Limited to isolated 24 V DC power supply

• On-State Current:

  • Min: 2.0 mA

  • Nominal: 9.0 mA

  • Max: 10.0 mA

• Off-State Current (min): 1.5 mA into 24 V DC IEC+ terminal

• Off-State Voltage (max): 5.0 V DC on 24 V DC IEC+1 terminal

Diagnostic Functions

• Wire-Off Detection: 0.4 mA for proximity, encoder, or contact switch with 50 kΩ shunt resistor

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