Allen-Bradley 1756-IB32 ControlLogix Digital Input Module

The 1756-IB32 is a high-density ControlLogix digital input module designed for On/Off detection within PLC and DCS automation architecture. It operates at a nominal 24V DC input voltage (10…31.2V DC range) and features 32 sinking or sourcing input points divided into two groups of 16 points. The module interfaces with sensing devices such as limit switches, proximity sensors, push buttons, and selector switches, transmitting input status asynchronously to Logix 5000 controllers via the Producer/Consumer network model over the backplane.

Features

• 32-Point High Density: Provides 32 input channels organized into two 16-point groups to optimize chassis slot usage.
• Removal and Insertion Under Power (RIUP): Allows maintenance and module replacement without shutting down the system or interrupting chassis backplane communication.
• Producer/Consumer Communication: Enables the module to multicast input data asynchronously based on Change of State (COS) or Requested Packet Interval (RPI) without controller polling.
• Software-Configurable Input Filters: Offers adjustable On-to-Off and Off-to-On input filter times via the software interface to increase noise immunity.
• Multiple Owner-Controller Capability: Supports data multicasting to multiple owner-controllers configured with identical parameters.
• Flexible Wiring Options: Compatible with 1756 Removable Terminal Blocks (RTB) or Bulletin 1492 Interface Modules (IFM).

Applications

• Automated assembly lines and discrete manufacturing execution.
• Monitoring position limit switches, proximity sensors, and photo-eyes.
• Process control interlocks and status monitoring via push buttons and selector switches.
• High-density digital signal acquisition in distributed control system (DCS) architectures.

Technical Specifications

Installation Guidelines

• Chassis and Power: Ensure the 1756 ControlLogix chassis and power supply are properly mounted and grounded according to standard industrial enclosure guidelines before inserting the module.
• Module Insertion: Align the module with the top and bottom chassis guides, sliding it in until the locking tabs snap securely into place.
• RTB / Wiring Connections: Pre-wire the Removable Terminal Block (RTB) or Bulletin 1492 IFM wiring system. Verify that mechanical keying slots match the intended module type before seating the RTB onto the front connector pins.
• Hot Swapping (RIUP): While RIUP is supported, proper safety practices for working near energized electrical equipment must be maintained during insertion or removal.