Product Details
Product Description
The Allen Bradley 1794-IJ2 is a FLEX I/O frequency input module designed to capture and process high-speed frequency signals in distributed control systems. It provides two isolated input channels with frequency and gate functionality, along with two isolated DC outputs. Supporting both sine and square wave inputs, the module ensures accurate measurement and reliable signal conversion for industrial automation applications.
Technical Specifications
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Manufacturer Allen Bradley
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Product Line FLEX I/O 1794
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Product Type Frequency Input Module
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Part Number 1794-IJ2
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Weight 0.50 lbs (0.23 kg)
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Inputs 2 frequency inputs per channel (sine or square wave)
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Input Frequency Range 1–32 kHz
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Input Pulse Width 20 µs
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On-State Voltage (Min) 10 V DC
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On-State Current (Nom) 9.0 mA
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Outputs 2 isolated DC outputs
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Output Voltage Nominal 24 V DC, minimum 10 V DC
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Output Current Max 1.0 A per channel
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Output Off-State Voltage Max 31.2 V DC
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Raw Frequency Value Up to 32,767 or 3,276.7 (depending on range)
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External DC Supply Range 19.0–31.2 V DC (includes 5% AC ripple)
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FlexBus Current 30 mA @ 5 V DC
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Power Dissipation 4.6 W max @ 31.2 V DC
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Thermal Dissipation 15.6 BTU/hr max @ 31.2 V DC
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Terminal Base Compatibility 1794-TB3G or 1794-TB3GS
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Mounting Style DIN rail
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Wire Size Determined by installed terminal base
Application Scenarios
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Frequency signal monitoring in distributed control systems
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Machine control requiring precise frequency input and gated signal processing
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Industrial automation environments with sine or square wave inputs
FAQ
Q: What frequency range does the 1794-IJ2 support? A: It supports input frequencies from 1 to 32 kHz for both sine and square wave signals.
Q: How many outputs are available? A: The module provides two isolated DC outputs.
Q: What terminal bases are compatible? A: It can be used with 1794-TB3G or 1794-TB3GS terminal bases.
Comparable Models
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1794-IJ2: 2-channel frequency input module with isolated outputs (this model)
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1794-IF4I: 4-channel isolated analog input module
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1794-IB16: 16-point DC input module
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Human-Machine Interface Design: Essential Guide to HMI Selection, Visualization, and Control System Integration
Human-Machine Interfaces (HMIs) serve as the primary operational window into complex industrial automation systems. Modern HMIs convert raw machine data into clear graphical displays, enabling operators to oversee entire manufacturing processes in real time. Instead of relying on physical control panels full of hardwired switches, engineers program interactive screens using intuitive graphics, dynamic color coding, and responsive touch interfaces. Over my 15 years in control systems engineering, I have observed HMIs transform from basic display screens into sophisticated command centers that drive operational efficiency across DCS and PLC environments.
Understanding Safety Relays in Industrial Automation: Architecture, Operation, and Functional Safety
Standard electromechanical relays provide basic electrical isolation between low-voltage control circuits and high-power output loads. A traditional switching relay features a magnetic coil driving mechanical Common (COM), Normally-Open (NO), and Normally-Closed (NC) contacts. However, standard relays pose severe functional risks when deployed in critical safety interlock circuits. High current inrush or mechanical wear can weld contacts together permanently. If contact welding occurs in an emergency stop circuit, pressing the button fails to halt hazardous machinery movements. Consequently, global functional safety standards prohibit standard relays for critical machine guarding functions.
Mastering Wire Identification in Industrial Automation: The Power of Ferrules and Cross-Ferruling
Proper wire labeling forms the cornerstone of reliable control system installation and long-term maintenance. In complex industrial automation environments, technicians terminate thousands of conductor ends inside control panels, marshalling racks, and field junction boxes. Ferrules serve as individual tube-shaped sleeve markers slipped onto conductors before final termination. While technicians historically relied on pre-printed individual letter rings, modern control panel builders utilize automated ferrule printing machines. These thermal-transfer printers generate durable, single-sleeve heat-shrink tags directly matching approved wiring schematics, significantly accelerating cabinet assembly workflows.