1794-IJ2 Series Allen-Bradley Flex I/O Frequency Input Card
Manufacturer: Allen-Bradley
Product No.: 1794-IJ2
Condition： In stock
Product Type: Input Frequency Module
Product Origin: USA
Payment: T/T, Western Union
Weight: 136g
Shipping port: Xiamen
Warranty: 12 months
Estimate delivery times: 12-26 days (International), 3-6 days (United States).
Return within 30 days of purchase. Duties & taxes are non-refundable.
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Engineering Architecture & System Matrix
The 1794-IJ2 module designed by Allen-Bradley operates as a high-performance Frequency Input Module within the distributed 1794 Flex I/O Series. This modular DIN-rail processor card captures high-speed pulse trains, calculates dynamic rate and acceleration parameters, and provides isolated digital actuation outputs for industrial control platforms.
- Catalog Number: 1794-IJ2
- Manufacturer & Brand: Rockwell Automation / Allen-Bradley
- Product Type: Flex I/O Dual-Channel Frequency Input & Output Module
- Compatible Terminal Bases: 1794-TB3G or 1794-TB3GS spring/screw clamp bases
- FlexBus Backplane Draw: 30 mA maximum at 5V DC
- External Supply Range: 19.0 to 31.2V DC (incorporating 5% max AC ripple)
Technical Specifications & Performance Metrics
| Performance Parameter | Engineering Specification |
|---|---|
| Input Channels & Range | 2 channels (Frequency and Gate inputs per channel); 1 to 32 kHz sine or square wave |
| Minimum Input Pulse Width | 20 microseconds minimum pulse duration |
| Raw Frequency Value Format | Maximum 32,767 or 3,276.7 count scaling dependent on range selection |
| Output Configuration | 2 isolated 24V DC outputs; 1.0A max per channel continuous load |
| Resolution & Accuracy Scope | 0.01% to 0.00002% resolution across 2–1000 ms sample window; ±0.02% to ±0.00004% sampling accuracy |
| Output Switching Speed | 0.5 ms turn-on time; 1.0 ms turn-off time triggered by frequency/acceleration alarms |
| Thermal & Power Dissipation | 4.6 Watts max at 31.2V DC; 15.6 BTU/hr thermal output |
| Environmental Operating Limits | 0°C to 55°C operating temperature envelope; 10A max starting current surge |
Industrial Applications & Rotary Machinery
- High-Speed Turbine Overspeed Protection: Monitors emergency shaft rotational velocity to trigger high-speed trip solenoids.
- Positive Displacement Flow Metering: Integrates pulse outputs from turbine flowmeters to calculate precise volumetric flow rates.
- Conveyor Speed & Acceleration Tracking: Measures rotational velocity shifts on heavy industrial drive assemblies and stamping presses.
Diagnostic Capabilities & Fault Indication
- Wire-Off Fault Detection: Dedicated front-panel status LED highlights open-circuit wiring faults immediately.
- Front-Panel I/O Monitoring: Individual channel input, output, and power status indicators provide instant visual loop verification.
- Alarm Switching Logic: Assigns output switching thresholds directly to frequency thresholds or rate-of-change acceleration alarms.
Global PLC Spare HUB's Insight
Deploying high-speed pulse and frequency counting in distributed I/O drops demands rigorous attention to grounding and signal shielding. The 1794-IJ2 processes signals up to 32 kHz, making it exceptionally sensitive to electromagnetic interference if sensor cables run parallel to high-voltage motor lines. When configuring sample windows between 2 ms and 1000 ms, engineers must balance resolution requirements against control loop update times. Additionally, ensure the terminal base (1794-TB3G or 1794-TB3GS) is securely seated on the DIN rail with the FlexBus connector fully engaged to prevent intermittent backplane communication errors during high-vibration plant operations.
Logistics, Packaging & Warranty Terms
- Condition Status: 100% New & Original factory-sealed hardware.
- Warranty Coverage: Comprehensive 12 Months factory warranty from date of purchase.
- Order Handling: Rapid 24 to 48 hour processing and dispatch window.
- Global Express Shipping: Fast, secure air delivery worldwide via FedEx, UPS, and DHL.
Frequently Asked Questions
How do the gate input channels function alongside frequency inputs on the 1794-IJ2?
Each channel features both a frequency input and a gate input, allowing external control signals to start, stop, or window pulse counting intervals for precise batch or rotational measurements.
What surge current capacity do the isolated DC outputs support during actuation?
The 24V DC outputs support a surge current of up to 2 Amps for 50 milliseconds, which is repeatable every 2 seconds to handle inductive solenoid loads.
Why is sample frequency configuration critical for module resolution?
Module resolution scales dynamically from 0.01% down to 0.00002% depending on the configured sample frequency window ranging from 2 ms to 1000 ms.
What selection criteria apply when choosing between 1794-TB3G and 1794-TB3GS terminal bases?
Select the 1794-TB3G for standard screw clamp field wiring or the 1794-TB3GS when spring-clamp terminal connections are preferred for high-vibration cabinet installations.
How does the module respond when an input signal exceeds the maximum frequency range?
Input frequencies exceeding the 32 kHz threshold or reaching maximum range limits will clip raw register counts at 32,767 or 3,276.7 depending on the selected engineering scale.
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Q: Are these parts 100% original and new?
A: Yes. Every component is guaranteed to be 100% original, brand-new, and factory-sealed. We also provide a 12-month comprehensive warranty for your peace of mind.
Q: How fast is the shipping to my country?
A: For in-stock items, we offer same-day dispatch. International express shipping (DHL/FedEx/UPS) typically delivers within 3–5 business days worldwide.
Q: Can I get a formal quotation with shipping costs?
A: Absolutely. Our sales team is ready to provide a detailed Proforma Invoice (PI) including the most competitive shipping rates for your location.
Q: Do you offer discounts for bulk orders?
A: We provide volume-based pricing for large projects or multiple-item orders. Please contact us to get our Best Price Guarantee.
12-Month Comprehensive Warranty
Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.
- Coverage: Functional defects and hardware failures under normal operating conditions.
- Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.
Returns & Exchange Policy
We offer a 30-day return policy to ensure you receive the exact part your system requires.
- Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
- RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
- Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.
Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.
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