Allen-Bradley 1794-IF4I Flex I/O Isolated Analog Input Module

Allen-Bradley 1794-IF4I Flex I/O Isolated Analog Input Module

Channel Isolation and Signal Flexibility

• Fully Isolated Inputs: The 1794-IF4I provides four individually isolated channels that prevent ground loops and electrical interference from affecting measurement accuracy. This isolation protects sensitive control systems from voltage transients on field wiring.
• Versatile Signal Support: Engineers can configure each channel for multiple signal types including 0-20 mA, 4-20 mA, ±20 mA, ±10 VDC, 0-10 VDC, ±5 VDC, and 0-5 VDC. This flexibility allows the module to interface with virtually any industrial sensor or transmitter.
• User-Configurable Ranges: All input ranges are software-configurable, eliminating the need for hardware jumpers or switches. You can change signal types without opening the panel or removing the module.
• Differential Inputs: The four differential-ended inputs provide superior noise rejection compared to single-ended designs. This ensures accurate measurements even in electrically noisy industrial environments.

Technical Specifications and Performance

• High Resolution: The 1794-IF4I delivers 16-bit resolution for unipolar operation and 15 bits plus sign for bipolar signals. Voltage resolution measures 0.156 mV per count for unipolar and 0.313 mV per count for bipolar. Current resolution provides 0.320 µA per count for unipolar and 0.640 µA per count for bipolar.
• Sigma-Delta Conversion: The module uses advanced Sigma-Delta analog-to-digital converter (ADC) technology for precise signal measurement. The update rate is selectable at 2.5 ms, 5.0 ms, or 7.5 ms for all channels, allowing engineers to balance speed and resolution based on application requirements.
• Accuracy: It maintains an absolute accuracy of 0.1% of full scale at 25 °C for both voltage and current inputs. The voltage input accuracy includes gain, repeatability, offset, and nonlinearity error terms in this specification.
• Accuracy Drift: Temperature stability remains excellent with 0.0028% of full scale per °C for voltage inputs and 0.0038% of full scale per °C for current inputs. This ensures consistent performance across varying ambient temperatures.
• Step Response: The step response varies based on the selected conversion rate. At 1200 Hz conversion rate, response time is 0.6 ms. At 600 Hz, response is 6.7 ms. At 300 Hz, response is 13.4 ms. At 150 Hz, response is 26.7 ms.
• Power Requirements: The module draws 50 mA from the 5V DC FlexBus. External DC power supply current is 80 mA at 24V DC nominal, with an acceptable range of 19.0 to 31.2V DC including 5% AC ripple. Total current draw measures 145 mA at 5.1V and 125 mA at 24V.
• Power Dissipation: Maximum power dissipation is 2.0W at 31.2V DC, with thermal dissipation of 6.8 BTU/hour under the same conditions. This low power consumption minimizes heat buildup in control panels.
• Environmental Specifications: The 1794-IF4I operates in temperatures from 0 to 55 °C (32 to 131 °F) with maximum surrounding air temperature of 55 °C. Storage temperature range extends from -40 to 85 °C (-40 to 185 °F). It handles non-condensing relative humidity of 5 to 95%.
• Vibration and Shock: The module withstands vibration of 5g at 10 to 500 Hz. It survives operating shock of 30g and non-operating shock of 50g, ensuring reliability in harsh industrial environments.
• Isolation Voltage: Continuous isolation voltage reaches 120V when using 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3T, or 1794-TB3TS bases. When using the 1794-TBN base, continuous isolation voltage increases to 250V for higher isolation requirements.

Frequently Asked Questions (FAQ)

• Is the Allen-Bradley 1794-IF4I a genuine new product?
  Yes, we supply the 1794-IF4I as a brand new, original Allen-Bradley product in factory-sealed condition. We never provide used, refurbished, or counterfeit items.
• What is the difference between the 1794-IF4I and standard analog modules?
  The 1794-IF4I provides full channel-to-channel isolation, meaning each of the four inputs is electrically isolated from the others. This prevents ground loops and protects against voltage differences between sensors, unlike non-isolated modules where inputs share a common reference.
• Which terminal base should I choose for 250V isolation?
  If you require 250V continuous isolation, you must use the 1794-TBN terminal base with the 1794-IF4I. All other compatible bases provide 120V continuous isolation.
• Can I mix different signal types on different channels?
  Yes, you can independently configure each of the four channels for different input signal types. One channel can measure 4-20 mA while another measures ±10V, all within the same 1794-IF4I module.
• What conversion rate should I select for my application?
  The 1794-IF4I offers selectable update rates of 2.5 ms, 5.0 ms, and 7.5 ms. Choose faster rates for applications requiring quick response, such as motion control. Choose slower rates for better noise rejection in steady-state process monitoring.
• Do you have the 1794-IF4I in stock?
  Yes, we maintain inventory of the 1794-IF4I module. We typically process and ship orders within 5 business days using DHL, UPS, or FedEx based on your location and shipping preference.
• What is your return policy?
  We offer a 30-day return window for the 1794-IF4I provided the item remains in its original, unused condition with all packaging intact and unopened.
• Does this module require field calibration?
  The 1794-IF4I arrives factory-calibrated and performs accurately without immediate calibration. However, unlike some Flex I/O modules, you can recalibrate this module in the field if your application demands periodic verification or after many years of service.
• What is the step response time for each conversion rate?
  At 1200 Hz conversion rate, step response is 0.6 ms. At 600 Hz, response is 6.7 ms. At 300 Hz, response is 13.4 ms. At 150 Hz, response is 26.7 ms. These values represent the time to reach final value after an input step change.

Contact Information Inquiries: sales@nex-auto.com , +86 153 9242 9628

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