Product Details
Overview
The Allen-Bradley 1756-IF8H is an 8-channel HART-enabled analog input module for ControlLogix systems, offering precise measurement of voltage and current signals while supporting HART communication standards 5, 6, and 7. The module is designed for reliable signal acquisition with robust overvoltage protection, isolation, and high-resolution performance.
Technical Specifications
Module Details
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Model: 1756-IF8H
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Input Channels: 8 differential inputs with 1 HART modem per module
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Input Voltage Ranges: 0…5V, 1…5V, 0…10V, ±10V
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Input Current Ranges: 0…20 mA, 4…20 mA
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Resolution: 16–21 bits across all ranges
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Compatible HART Versions: HART 5, 6, 7
Performance
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Analog Scan Time: 18–488 ms (filter dependent)
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HART Scan Time: Typically 1 s per enabled channel; ~10 s for all 8 channels active
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Open Circuit Detection: 5 s
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Overvoltage Protection: 30V DC for voltage; 8V DC for current
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Isolation Voltage: 50V continuous; basic insulation type; tested 1500V AC for 60 s, I/O to backplane
Accuracy & Calibration
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Voltage Accuracy: Better than 0.05% of range (HART disabled)
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Current Accuracy: Better than 0.15% of range (HART disabled)
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Calibration Interval: 12 months typical
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Temperature Rating: North America T4A / IEC T4
Environmental & Physical
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Operating Temperature: 0°C to 60°C
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Storage Temperature: -40°C to 85°C
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Relative Humidity: 5–95% non-condensing
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Enclosure: Open-style, no protective housing
Applications
The 1756-IF8H module is ideal for precise analog signal monitoring in process control, supporting HART communication for integration with smart field devices. Typical applications include level measurement, temperature control, and flow monitoring.
FAQ
Q: How many HART channels does the module support?
A: The module provides 1 HART modem for 8 differential analog inputs.
Q: What input types are supported?
A: Voltage (0…5V, 1…5V, 0…10V, ±10V) and current (0…20 mA, 4…20 mA).
Q: What is the update time for HART readings?
A: Typically 1 s per active HART channel; around 10 s if all 8 channels are enabled.
Q: Does it offer overvoltage protection?
A: Yes, 30V DC for voltage inputs and 8V DC for current inputs.
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
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.