• Allen-Bradley 1746-NI16I
  • Allen-Bradley 1746-NI16I
  • Allen-Bradley 1746-NI16I
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Allen-Bradley 1746-NI16I SLC 500 16-Point Analog Input Module

Allen-Bradley 1746-NI16I SLC 500 16-Point Analog Input Module

Description

The Allen-Bradley 1746-NI16I is a high-density analog input module designed for the SLC 500 programmable logic controller (PLC) system. This module provides 16 single-ended, backplane-isolated input channels with 16-bit resolution,...

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SKU: 1746-NI16I
Vendor: Allen-Bradley
Category: Analog Input Module
Related Series:

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Description

The Allen-Bradley 1746-NI16I is a high-density analog input module designed for the SLC 500 programmable logic controller (PLC) system. This module provides 16 single-ended, backplane-isolated input channels with 16-bit resolution, making it suitable for high-precision monitoring of current-based process signals. It is engineered to support a variety of current ranges, including 0 to 20 mA, 4 to 20 mA, and +/- 20 mA, facilitating integration into diverse industrial control environments.

Features

  • 16-channel analog current input module for SLC 500 systems.
  • 16-bit resolution for high-accuracy signal conversion.
  • Supports multiple input signal types: 0-20 mA, 4-20 mA, +/- 20 mA, and 0-1 mA.
  • Integrated open-circuit detection for rapid identification of sensor or wiring faults.
  • Individual channel-to-channel isolation for enhanced noise immunity and signal integrity.
  • Compact single-slot module design for efficient chassis space utilization.
  • 25-pin D-shell connector interface for reliable field wiring.

Applications

  • Oilfield water injection automation systems (pressure monitoring).
  • Wastewater treatment plants (aeration tank DO and pH monitoring).
  • Power station auxiliary control (transformer and bearing temperature monitoring).
  • Hydraulic system monitoring for large-scale presses and rolling machines.

Technical Specifications

Model 1746-NI16I
Input Channels 16
Resolution 16-bit
Input Signal Types 0-20 mA, 4-20 mA, +/- 20 mA, 0-1 mA
Backplane Current (5V DC) 125 mA
Backplane Current (24V DC) 75 mA
Thermal Dissipation 2.43 Watts
Input Impedance 249 Ohms
Operating Temperature -25 to 60 degC (-13 to 140 degF)
Relative Humidity 5% to 95% (non-condensing)
Connector Type 25-pin D-shell

Installation Guidelines

  • Ensure the PLC chassis is powered down before inserting or removing the module to prevent electrical damage.
  • The module is designed for standard SLC 500 chassis mounting; ensure it is fully seated and the retaining screws are tightened.
  • Use shielded twisted-pair cabling for analog signals to minimize EMI/RFI interference.
  • Maintain proper grounding practices for the analog common terminal to ensure signal stability.
  • Keep the module clear of high-voltage power lines and high-EMI sources within the control cabinet.
  • If removing the terminal block, use the provided labeling to ensure correct re-wiring of input channels.

FAQs

What is the 1746-NI16I?

The Allen-Bradley 1746-NI16I is a 16-channel, high-resolution analog current input module designed for the SLC 500 platform.

How do I configure the 1746-NI16I module?

Configuration is performed in RSLogix 500 (offline or online) via the I/O configuration screen. It is a multi-class module, with Class 3 recommended for optimal performance.

What are the 1746-NI16I power requirements?

The module draws 125 mA at 5V DC and 75 mA at 24V DC from the SLC 500 backplane.

How can I detect a sensor disconnection?

The 1746-NI16I features built-in open-circuit detection, which allows the controller to report a fault condition if a sensor loop is broken.