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
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.
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.