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Description

The Allen-Bradley 1756-IH16ISOE is a specialized 16-point digital isolated input module designed for the ControlLogix platform. This module is engineered for Sequence of Events (SOE) recording, providing high-resolution time-stamping for critical process events. With individual isolation for each input, it ensures robust signal integrity and protection against cross-channel interference in demanding industrial environments.

Features

  • 16 individually isolated input channels.
  • Integrated Sequence of Events (SOE) capability for precise timing analysis.
  • Supports 125V DC sink/source input configurations.
  • Optimized for high-reliability monitoring within ControlLogix rack systems.
  • Low power dissipation of 5.5 Watts at 60 degC.

Technical Specifications

Model 1756-IH16ISOE
Input Voltage Range 90-140V DC
Backplane Current (5V) 275 mA
Backplane Current (24V) 2 mA
Off-State Current 0.3 mA
Operating Current (90V DC) 1.15 mA (min)
Operating Current (140V DC) 1.85 mA (max)
Input Delay Time 75 microseconds + filter time

Installation Guidelines

  • Ensure the ControlLogix chassis is powered down before inserting or removing the module to prevent electrical damage.
  • The module must be installed in a standard ControlLogix chassis; ensure proper seating and engagement with the backplane connectors.
  • Use appropriate shielded cabling to minimize EMI/RFI interference, especially in high-voltage DC applications.
  • Maintain adequate ventilation around the chassis to keep ambient temperatures within the operational limits.
  • Verify that all field wiring is correctly terminated according to the module's wiring diagram to prevent ground loops or short circuits.

FAQ

What is the primary function of the SOE feature in this module?
The Sequence of Events (SOE) functionality allows the module to capture the exact time a state change occurs on an input, which is critical for diagnostics and post-incident analysis in complex automation sequences.

Can this module handle both sink and source inputs?
Yes, the 1756-IH16ISOE is designed to support both sink and source configurations for 125V DC inputs, providing flexibility for various field device requirements.

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