Allen-Bradley 1756-IF8 | Non-isolated Analog Voltage/Current Input Modules

Product Overview

The Allen-Bradley 1756-IF8 is an eight-channel non-isolated analog input module for ControlLogix Programmable Automation Controllers (PACs). It supports both voltage and current input signals, making it ideal for integrating with instruments like transmitters, transducers, signal splitters, and panel meters. With flexible wiring configurations, high-resolution signal conversion, and advanced filtering, this module ensures precise data acquisition for industrial automation applications.

Key Features

• Input Channels: 8 analog inputs
• Supported Signal Types:
  • Voltage: ±10VDC, 0-10VDC, 0-5VDC
  • Current: 0-20mA
• Resolution: 15-bit to 16-bit
  • ±10.25V → 320 µV/count (15 bits + sign bipolar)
  • 0-10.25V → 160 µV/count (16 bits)
  • 0-5.125V → 80 µV/count (16 bits)
  • 0-20.5mA → 0.32 µA/count (16 bits)
• Conversion Method: Sigma-Delta ADC
• Data Format:
  • Integer Mode (Left Justified, 2’s Complement)
  • IEEE 32-bit Floating Point
• Backplane Power Consumption:
  • 5V → 150 mA
  • 24V → 40 mA
• Max Power Dissipation:
  • Voltage Mode → 1.73 W
  • Current Mode → 2.33 W
• Terminal Block Compatibility: 1756-TBCH, 1756-TBSH

Wiring Configurations

The 1756-IF8 can be wired in three different ways, depending on system requirements:

1. Single-Ended Wiring: All input signals share a common ground, maximizing the number of available channels.
2. Differential Wiring: Uses separate signal pairs, improving noise immunity in electrically noisy environments.
3. High-Speed Mode Differential Wiring: Provides the fastest data updates but limits the number of usable channels.

Each wiring method affects scan time, ranging from 5 ms to 488 ms, based on configuration.

Advanced Features

This module is equipped with multiple signal quality monitoring tools, including:

• Real-Time Sampling (RTS) for precise, time-sensitive data collection.
• Digital Filtering to smooth out transient noise.
• Under-Range / Over-Range Detection to prevent incorrect readings.
• Wire-Off Detection for identifying disconnected channels.
• Process Alarms & Rate Alarms to alert operators of unexpected changes.

Applications

The 1756-IF8 is widely used for monitoring and controlling critical process variables, such as:

• Pressure, Level, Temperature, Flow, Speed
• Vibration, Turbidity, Viscosity
• Other industrial process values

It interfaces with various analog instruments, ensuring seamless integration with SCADA systems, HMI displays, and control algorithms like PID loops.

Lifecycle & Availability

• Product Status: Active
• UPC: 10612598171795
• UNSPSC: 32151705

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• Email: uma@meloauto.com
• WhatsApp: +8615915488782
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• Address: Unit 601, Powerlong International Center, No. 1599 Luling Road, Siming District, Xiamen City, Fujian, China

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